{"id":13642553,"url":"https://github.com/picolibc/picolibc","last_synced_at":"2025-05-14T04:03:15.840Z","repository":{"id":36999957,"uuid":"185100624","full_name":"picolibc/picolibc","owner":"picolibc","description":"picolibc - a C library designed for embedded 32- and 64- bit systems.","archived":false,"fork":false,"pushed_at":"2025-05-09T01:48:32.000Z","size":138482,"stargazers_count":1323,"open_issues_count":52,"forks_count":215,"subscribers_count":47,"default_branch":"main","last_synced_at":"2025-05-09T02:41:57.116Z","etag":null,"topics":[],"latest_commit_sha":null,"homepage":"https://keithp.com/picolibc","language":"C","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":"mirror/newlib-cygwin","license":"gpl-2.0","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/picolibc.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":"CONTRIBUTING.md","funding":null,"license":"COPYING.GPL2","code_of_conduct":"CODE_OF_CONDUCT.md","threat_model":null,"audit":null,"citation":null,"codeowners":".github/CODEOWNERS","security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null,"zenodo":null}},"created_at":"2019-05-06T01:01:25.000Z","updated_at":"2025-05-07T00:47:18.000Z","dependencies_parsed_at":"2023-10-01T19:45:13.731Z","dependency_job_id":"247b96be-6cf1-449b-b47e-92d13a76c89e","html_url":"https://github.com/picolibc/picolibc","commit_stats":{"total_commits":24730,"total_committers":571,"mean_commits":43.30998248686515,"dds":0.7160129397492924,"last_synced_commit":"e0a04fec075f5cb1ddb80ea8c359748ef72b9122"},"previous_names":[],"tags_count":795,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/picolibc%2Fpicolibc","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/picolibc%2Fpicolibc/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/picolibc%2Fpicolibc/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/picolibc%2Fpicolibc/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/picolibc","download_url":"https://codeload.github.com/picolibc/picolibc/tar.gz/refs/heads/main","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":254067107,"owners_count":22009080,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":[],"created_at":"2024-08-02T01:01:32.976Z","updated_at":"2025-05-14T04:03:15.814Z","avatar_url":"https://github.com/picolibc.png","language":"C","funding_links":[],"categories":["Standard Libraries","C","工具、材料"],"sub_categories":["Advanced books","软件：嵌入式操作系统、驱动、GUI 库等"],"readme":"# Picolibc\nCopyright © 2018-2023 Keith Packard\n\nPicolibc is library offering standard C library APIs that targets\nsmall embedded systems with limited RAM. Picolibc was formed by blending\ncode from [Newlib](http://sourceware.org/newlib/) and\n[AVR Libc](https://www.nongnu.org/avr-libc/).\n\nBuild status:\n\n * ![Linux](https://github.com/picolibc/picolibc/workflows/Linux/badge.svg?branch=main)\n * ![Zephyr](https://github.com/picolibc/picolibc/workflows/Zephyr/badge.svg?branch=main)\n * ![Coreboot](https://github.com/picolibc/picolibc/workflows/Coreboot/badge.svg?branch=main)\n * ![Mac OS X](https://github.com/picolibc/picolibc/workflows/Mac%20OS%20X/badge.svg)\n\n## License\n\nPicolibc source comes from a variety of places and has a huge variety\nof copyright holders and license texts. While much of the code comes\nfrom Newlib, none of the GPL-related bits used to build the library\nare left in the repository, so all of the source code uses BSD-like\nlicenses, a mixture of 2- and 3- clause BSD itself and a variety of\nother (mostly older) licenses with similar terms.\n\nThere are two files used for testing printf, test/printf-tests.c and\ntest/testcases.c which are licensed under the GPL version 2 or\nlater. There is also a shell script, GeneratePicolibcCrossFile.sh\nwhich is licensed under the AGPL version 3 or later which is provided\nas a helper for people building the library, but not used by picolibc\notherwise.\n\nThe file COPYING.picolibc contains all of the current copyright and\nlicense information in the Debian standard machine-readable format. It\nwas generated using the make-copyrights and find-copyright\nscripts.\n\n## Supported Architectures\n\nPicolibc has integrated testing support for many architectures which\nis used to validate the code for all patch integration:\n\n * ARC (32- and 64- bit)\n * ARM (32- and 64- bit)\n * i386 (Native and Linux hosted, for testing)\n * LatticeMico32\n * LoongArch\n * Motorola 68000 (m68k)\n * MIPS\n * MSP430\n * Nios II\n * OpenRisc\n * Power9\n * Renesas RX\n * RISC-V (both 32- and 64- bit)\n * SparcV8 (32 bit)\n * SuperH\n * x86_64 (Native and Linux hosted, for testing)\n * Xtensa ESP32\n\nThere is also build infrastructure and continuous build validation,\nbut no integrated testing available for additional architectures:\n\n * Microblaze (32-bit, big and little endian)\n * Sparc64\n * Xtensa (ESP8266, LX106)\n\nSupporting architectures that already have Newlib code requires:\n\n 1. newlib/libc/machine/_architecture_/meson.build to build the\n    architecture-specific libc bits. This should at least include\n    setjmp/longjmp support as these cannot be performed in\n    architecture independent code and are needed by libstdc++.\n\n 2. Checking for atomic support for tinystdio. Tinystdio requires\n    atomics for ungetc to work correctly in a reentrant\n    environment. By default, it stores them in 16-bit values, but\n    some architectures only have 32-bit atomics. To avoid ABI\n    issues, the size selected isn't detected automatically, instead\n    it must be configured in newlib/libc/tinystdio/stdio.h.\n\n 3. newlib/libm/machine/_architecture_/meson.build to build any\n    architecture-specific libm bits\n\n 4. picocrt/machine/_architecture_ source code and build bits\n    for startup code needed for the architecture. Useful in all\n    cases, but this is necessary to run tests under qemu if your\n    platform can do that.\n\n 5. cross-_gcc-triple_.txt to configure the meson cross-compilation\n    mechanism to use the right tools\n\n 6. do-_architecture_-configure to make testing the cross-compilation\n    setup easier.\n\n 7. newlib/libc/picolib support. This should include whatever startup\n    helpers are required (like ARM interrupt vector) and TLS support\n    (if your compiler includes this).\n\n 8. run-_architecture_ script to run tests under QEMU. Look at the ARM\n    and RISC-V examples to get a sense of what this needs to do and\n    how it gets invoked from the cross-_gcc-triple_.txt configuration\n    file.\n\n## Relation to newlib\n\nPicolibc is mostly built from pieces of newlib, and retains the\ndirectory structure of that project. While there have been a lot of\nchanges in the build system and per-thread data storage, the bulk of\nthe source code remains unchanged.\n\nTo keep picolibc and newlib code in sync, newlib changes will be\nregularly incorporated. To ease integration of these changes into\npicolibc, some care needs to be taken while editing the code:\n\n * Files should not be renamed.\n * Fixes that also benefit users of newlib should also be sent to the\n   newlib project\n * Changes, where possible, should be made in a way compatible with\n   newlib design. For example, instead of using 'errno' (which is\n   valid in picolibc), use __errno_r(r), even when 'r' is not defined\n   in the local context.\n\nThe bulk of newlib changes over the last several years have been in\nareas unrelated to the code used by picolibc, so keeping things in\nsync has not been difficult so far.\n\n## Documentation\n\nIntroductory documentation. Read these first:\n\n * [Building Picolibc](doc/build.md). Explains how to compile picolibc yourself.\n * [Using Picolibc](doc/using.md). Shows how to compile and link\n   applications once you have picolibc built and installed.\n * [Linking with Picolibc.ld](doc/linking.md). Provides more details\n   about the linking process.\n * [Hello World](hello-world/README.md). Build and run a stand-alone C\n   application by following step-by-step instructions\n\nDetailed documentation. Use these to learn more details about how to\nuse Picolibc:\n\n * [Picolibc initialization](doc/init.md)\n * [Operating System Support](doc/os.md).\n * [Printf and Scanf in Picolibc](doc/printf.md)\n * [Thread Local Storage](doc/tls.md)\n * [Re-entrancy and Locking](doc/locking.md)\n * [Selecting ctype implementation](doc/ctype.md)\n * [Picolibc as embedded source](doc/embedsource.md)\n * [Releasing Picolibc](doc/releasing.md)\n * [Copyright and license information](COPYING.picolibc)\n\n## Releases\n\n### Picolibc release 1.8.10\n\n * Add missing POSIX constants to limits.h.\n\n * Add Renesas RX support. Thanks to Duy Dguyen.\n\n * Update to Unicode 16.0. This matches glibc 2.41.\n\n * Add TLS support and testing on loongarch, m68k, or1k, powerpc and\n   superh.\n\n * Fix a couple of strncpy bugs in ARC assembly code.\n\n * Clean up preprocessor symbols: remove unused symbols, rename\n   picolibc.h symbols to use a __ prefix and not include PICOLIBC or\n   NEWLIB in the names.\n\n * Detect compiler attributes and builtins at compile time rather than\n   configure time where possible. Delete attributes and builtins not\n   used within the library implementation.\n\n * Remove non-standard elf.h and mstats API.\n\n * Clean up float predicates to make sure we provide implementations\n   of isinf, isnan and finite for all three types, both with and\n   without __ prefixes. Use symbol aliases to share the same function\n   implementation. Use the __ versions for the type generic macros\n   instead of fpclassify. Switch users of these within the math\n   library to use the type-generic versions.\n\n * Start SuperH FPU in single mode when required.\n\n * Test sh1 and sh2 targets using the binutils simulator.\n\n * Initialize PowerPC IPLT table at startup.\n\n * Switch printf/scanf aliases to prefer --printf=/--scanf= compiler\n   options\n\n * Control UCS-2 and UCS-4 locales with mb-ucs-charsets configuration\n   option.\n\n * Add stdio-locking option to provide full POSIX re-entrancy support\n   in tinystdio. Thanks to Alexey Lapshin.\n\n * Add wcsto* string to number functions using tinystdio conversion\n   code. Avoids malloc call for float conversions.\n\n * Add TLS API support for x86 targets. Thanks to TK Chia.\n\n * Add -fsanitize=undefined handlers and make library build with that\n   enabled.\n\n### Picolibc release 1.8.9\n\n * Use common clang/gcc feature detection macros on arm.\n\n * Additional clang/compiler-rt work-arounds for arm which is less\n   consistent in handling exceptions.\n\n * Use clang multilib support for aarch64\n\n * Build fix on arc which would build two strchr versions in release\n   mode.\n\n * Add picocrt and semihost support for xtensa. Test xtensa dc233c.\n\n * Add C11's \u003cuchar.h\u003e header and implementation.\n\n * Add nano-malloc-clear-freed option to erase memory released in free\n   or realloc.\n\n * Add memset_explicit from C23.\n\n * Work around broken clang builtin malloc which fails to set errno.\n\n * Widen C++ _CTYPE_DATA array to fix mis-classification of \\t; C++\n   requires bitmasks for all ctype operations, and 8 bits is not\n   enough. Thanks to M-Moawad.\n\n * Update case conversion tables to Unicode 15.1.0\n\n * Fix documentation formatting. Thanks to Eduard Tanase.\n\n * Fix support for using long-long vfprintf version by default. Thanks\n   to Louis Peens.\n\n * Remove arm unaligned memcpy asm code. This couldn't support targets\n   that only supported unaligned access. Use a new faster C version\n   for this case.\n\n * Add asnprintf and vasnprintf as provided by newlib\n\n * Support ARM's FVP emulator. Thanks to Oliver Stannard.\n\n * Remove arc strlen asm code as it would access memory *before* the\n   provided buffer and fall afoul of the stack bounds checking\n   hardware.\n\n * Support --printf={d,f,l,i,m} in place of\n   -DPICOLIBC_*_PRINTF_SCANF. This is the syntax proposed in the\n   patches submitted to gcc for picolibc support.\n\n * Add LoongArch support, including testing. Thanks to Jiaxun Yang.\n\n * Use new picolibc-ci-tools project which builds custom toolchain\n   bits automatically. Thanks to Jiaxun Yang.\n\n * Add OpenRisc support, including testing. Thanks to Joel Holdsworth.\n\n * Add Lattic3Mico32 support, including testing. Thanks to Jiaxun Yang.\n\n * Add MIPS semihosting support. Thanks to Jiaxun Yang.\n\n * Add older GCC compiler support, including versions \u003c 4.4. Thanks to\n   Joel Holdsworth.\n\n * Add coreboot configurations and tests. Thanks to Jeremy Bettis and\n   Jon Murphy.\n\n * Fix numerous charset conversion errors for non-Unicode locales.\n\n * Make sure malloc return is aligned by using max_align_t. Thanks to\n   Alex Richardson.\n\n * Replace iconv and locale implementations with smaller code offering\n   the same locale functionality as before while the iconv code shares\n   the same charset support as the locale code instead of having a\n   completely separate implementation.\n\n### Picolibc release 1.8.8\n\n * Fixed 3 bugs in the powf computation. Thanks to Fabian Schriever.\n\n * Fixed a bunch of build issues found by Zephyr.\n\n * Improve C++ testing and compatibility.\n\n### Picolibc release 1.8.7\n\n * Support ARM v8.1-m BTI and PAC features\n\n * Fix stdio buffered backend automatic flushing of stdout when\n   reading stdin.\n\n * Support _FORTIFY_SOURCE=3\n\n * Fix several fesetround implementations to return an error when\n   passed an invalid argument. Thanks to Abdallah Abdelhafeez.\n\n * Document headers which the compiler must provide. Thanks to Alexey\n   Brodkin.\n\n * Generate mktemp/tmpnam filenames using random() so they don't\n   repeat even if they aren't used before another name is generated.\n\n * Set error flag when fgetc is called on an file without read\n   mode. Thanks to Mohamed Moawad.\n\n * Add type casting to CMPLX, CMPLXF and CMPLXL macros (as glibc\n   does). Thanks to Mostafa Salman.\n\n * Add mips64 support and build the library during CI.\n\n * Make fgets return any accumulated string on EOF instead of\n   always returning NULL. Thanks to Hana Ashour.\n\n * Use C99 minimum array size in asctime_r and ctime_r API\n   declarations ('[static 26]'). Bounds check the generated value and\n   return NULL/EOVERFLOW on overflow.\n\n * Make Zephyr's -Oz cmake option enable\n   PREFER_SIZE_OVER_SPEED. Thanks to Jonathon Penix.\n\n * Add funopen to tinystdio.\n\n * Validate all public headers with a C++ compiler to make sure they\n   at least compile successfully. Fix time.h.\n\n * Stop using -include picolibc.h during library build.\n\n * Add -Wmissing-declarations and -Wmissing-prototypes to library\n   build flags. Fix a rather large pile of missing prototypes caused\n   by source files failing to add _GNU_SOURCE or _DEFAULT_SOURCE\n   definitions.\n\n * Add POSIX \"unlocked\" I/O functions to tinystdio. These don't\n   actually do anything because tinystdio doesn't do any\n   locking. However, flockfile/funlockfile grab the global C library\n   lock so applications synchronizing with that API will \"work\".\n\n * Fix wide orientation handling in tinystdio. Thanks to Ahmed Shehab.\n\n * Add aarch64 soft float support for armv8. Clang allows this with\n   -march=armv8-a+nofp -mabi=aapcs-soft. This required building a\n   custom toolchain that included a compiler-rt library built with the\n   right options.\n\n * Add fgetpos and fsetpos to tinystdio. Thanks to Hana Ashour.\n\n * Restore missing members of 'struct sigevent'. Over eager removal of\n   _POSIX_THREADS support caused these to be accidentally deleted some\n   time ago.\n\n * Test on i386 native target.\n\n * Fix hex float scanning and printing. Thanks to Hana Ashour and\n   Ahmed Shehab.\n\n * Fix double rounding in %f printf. Thanks to Ahmed Shehab for\n   constructing a test case that identified the issue.\n\n * Add mem_align to the \"big\" malloc version. Thanks to Simon Tatham.\n\n * Adjust POSIX and C headers to limit symbol exposure to that\n   specified in the standards.\n\n * Fix rounding in float scanf. This does round twice for input longer\n   than the required number of digits, but that's permitted by the C\n   specification.\n\n * Support %a/%A in scanf. Support arbitrary precision in %a/%A\n   printf. Fix NaN/INF formatting in %a/%A printf. Thanks to Ahmed\n   Shehab.\n\n * Provide a build-time option to enable %n in printf. This is\n   disabled by default for security concerns, but supported in case\n   someone needs strict C conformance. Thanks to Ahmed Shehab.\n\n * Make freopen clear the unget buffer. Thanks to Mostafa Salman.\n\n * Fix wide and multi-byte character support in printf and scanf. For\n   strict standards conformance, there's now an option that enables\n   %lc/%ls in printf even if multi-byte support is not enabled.\n\n * Enable MMU in picocrt on A profile ARM and AARCH64 targets when\n   present. This is required by the latest qemu which now more\n   accurately emulates this hardware. Thanks to Alex Richardson.\n\n * Fix AARCH64 asm code in ILP32 mode.\n\n * Parse NaN(\u003cstring\u003e) in sscanf. This is required by the standard,\n   although picolibc doesn't do anything with \u003cstring\u003e. Thanks to\n   Mohamed Moawad.\n\n * Clean up header files. Picolibc tries to limit symbol definitions\n   to those specified in the C and POSIX specs.\n\n * Add support for C's Annex K functions. These are bounds-checking\n   versions of various memory and string functions. Thanks to Mostafa\n   Salman.\n\n * Perform locale string validation in newlocale even when _MB_CAPABLE\n   isn't defined. Thanks to Mostafa Salman.\n\n * Place compiler-rt library after C library when linking\n   tests. Thanks to Oliver Stannard.\n\n### Picolibc version 1.8.6\n\n * Fix some FORTITY_SOURCE issues with tinystdio\n\n * Add __eh_* symbols to picolibc.ld for LLVM libunwind. Thanks Alex\n   Richardson.\n\n * Merge in newlib annual release (4.4.0). Some minor updates to\n   aarch64 assembly code formatting (thanks to Sebastian Huber) and a\n   few other fixes.\n\n * Enable 32-bit SPARC for testing.\n\n * Fix a bunch of fmemopen bugs and add some tests. Thanks to Alex\n   Richardson.\n\n * Finish support for targets with unusual float types, mapping\n   target types to 32-, 64-, 80- and 128- bit picolibc code.\n\n * Add SuperH support, including testing infrastructure. Thanks to\n   Adrian Siekierka for help with this.\n\n * Improve debugger stack trace in risc-v exception code. Thanks to\n   Alex Richardson.\n\n * Add an option (-Dfast-bufio=true) for more efficient fread/fwrite\n   implementations when layered atop bufio. Thanks for the suggestion\n   from Zachary Yedidia.\n\n * Fix cmake usage of FORMAT_ variables (note the lack of a leading\n   underscore).\n\n * Remove explicit _POSIX_C_SOURCE definition in zephyr/zephr.cmake.\n\n * Clean up public inline functions to share a common mechanism for\n   using gnu_inline semantics. Fix isblank. This ensures that no\n   static inline declarations exist in public API headers which are\n   required to be external linkage (\"real\") symbols.\n\n * Create an alternate ctype implementation that avoids using the\n   _ctype_ array and just does direct value comparisons. This only\n   works when picolibc is limited to ASCII. Applications can select\n   whether they want this behavior at application compilation time\n   without needing to rebuild the C library. Thanks to P. Frost for\n   the suggestion.\n\n * Unify most fenv implementations to use gnu_inline instead of\n   regular functions to improve performance. x86 was left out because\n   those fenv functions are complicated by the mix of 8087 and modern\n   FPU support.\n\n * Add a separate FILE for stderr when using POSIX I/O. Split\n   stdin/stdout/stderr into three files to avoid pulling in\n   those which aren't used. Thanks to Zachary Yedidia.\n\n### Picolibc version 1.8.5\n\n * Detect clang multi-lib support correctly by passing compiler flags.\n   Thanks to xbjfk for identifying the problem.\n\n * Create a new 'long-long' printf variant. This provides enough\n   variety to satisfy the Zephyr cbprintf options without needing to\n   build the library from scratch.\n\n * Adjust use of custom binary to decimal conversion code so that it\n   is only enabled for types beyond the register size of the\n   target. This avoids the cost of this code when the application is\n   already likely to be using the soft division routines.\n\n### Picolibc version 1.8.4\n\n * Make math overflow and underflow handlers respect rounding modes.\n\n * Add full precision fma/fmaf fallbacks by adapting the long-double\n   code which uses two floats/doubles and some careful exponent\n   management to ensure that only a single rounding operation occurs.\n\n * Fix more m68k 80-bit float bugs\n\n * Fix m68k asm ABI by returning pointers in %a0 and %d0\n\n * Use an m68k-unknown-elf toolchain for m68k testing, including\n   multi-lib to check various FPU configurations on older and more\n   modern 68k targets.\n\n * Improve CI speed by using ccache on zephyr and mac tests,\n   compressing the docker images and automatically canceling jobs when\n   the related PR is updated. Thanks to Peter Jonsson.\n\n * Move a bunch of read-only data out of RAM and into flash by adding\n   'const' attributes in various places.\n\n * Add a new linker symbol, `__heap_size_min`, which specifies a\n   minimum heap size. The linker will emit an error if this much space\n   is not available between the end of static data and the stack.\n\n * Fix a bunch of bugs on targets with 16-bit int type. Thanks to\n   Peter Jonsson for many of these.\n\n * Work around a handful of platform bugs on MSP430. I think these are\n   compiler bugs as they occur using both the binutils simulator and\n   mspsim.\n\n * Run tests on MSP430 using the simulator that comes with gdb. Thanks to\n   Peter Jonsson for spliting tests apart to make them small enough to\n   link in under 1MB. This requires a patch adding primitive\n   semihosting to the simulator.\n\n * Provide a division-free binary to decimal conversion option for\n   printf at friends. This is useful on targets without hardware\n   divide as it avoids pulling in a (usually large) software\n   implementation. This is controlled with the 'printf-small-ultoa'\n   meson option and is 'false' by default.\n\n * Add 'minimal' printf and scanf variants. These reduce functionality\n   by removing code that acts on most data modifers including width\n   and precision fields and alternate presentation modes. A new config\n   variable, minimal-io-long-long, controls whether that code supports\n   long long types.\n\n * Add a 'assert-verbose' option which controls whether the assert\n   macro is chatty by default. It is 'true' by default, which\n   preserves the existing code, but when set to 'false', then a\n   failing assert calls __assert_no_msg with no arguments, saving the\n   memory usually occupied by the filename, function name and\n   expression.\n\n * Fix arm asm syntax for mrc/mcr instructions to make clang happy.\n   Thanks to Radovan Blažek for this patch.\n\n### Picolibc version 1.8.3\n\n * Fix bugs in floor and ceil implementations.\n\n * Use -fanalyzer to find and fix a range of issues.\n\n * Add __ubsan_handle_out_of_bounds implementation. This enables\n   building applications with -fsanitize=bounds and\n   -fno-sanitize-undefined-trap-on-error.\n\n * Validate exception configuration on targets with mixed exception\n   support where some types have exceptions and others don't. Right\n   now, that's only arm platforms where any soft float implementations\n   don't build with exception support.\n\n * Fix bugs in nexttowards/nextafter on clang caused by the compiler\n   re-ordering code and causing incorrect exception generation.\n\n * Use the small/slow string code when -fsanitize=address is used\n   while building the library. This avoids reading beyond the end of\n   strings and triggering faults.\n\n * Handle soft float on x86 and sparc targets. That mostly required\n   disabling the hardware exception API, along with a few other minor\n   bug fixes.\n\n * Add runtime support for arc, mips, nios2 and m68k. This enables CI\n   testing on these architectures using qemu.\n\n * Fix 80-bit floating math library support for m68k targets.\n\n * Fix arm testing infra to use various qemu models that expand\n   testing to all standard multi-lib configurations.\n\n * Adjust floating exception stubs to return success when appropriate,\n   instead of always returning ENOSYS.\n\n * Make sure sNaN raises FE_INVALID and is converted to qNaN in\n   truncl, frexpl and roundl\n\n * Avoid NaN result from fmal caused by multiply overflow when\n   addend is infinity (-inf + inf results in NaN in that case).\n\n### Picolibc version 1.8.2\n\n * Support _ZEPHYR_SOURCE macro which, like _POSIX_SOURCE et al,\n   controls whether the library expresses the Zephyr C library API.\n   This is also automatically selected when the __ZEPHYR__ macro is\n   defined and no other _*_SOURCE macro is defined.\n\n * Add another cross compile property, 'libgcc', which specifies the\n   library containing soft float and other compiler support routines.\n\n * Fix a couple of minor imprecisions in pow and 80-bit powl.\n\n * Merge newlib changes that included an update to the ARM assembly\n   code.\n\n * Replace inexact float/string conversion code with smaller code that\n   doesn't use floating point operations to save additional space on\n   soft float targets.\n\n * More cmake fixes, including making the inexact printf and locale\n   options work.\n\n### Picolibc version 1.8.1\n\n * Fix cmake build system to auto-detect compiler characteristics\n   instead of assuming the compiler is a recent version of GCC. This\n   allows building using cmake with clang.\n\n * Fix cmake build system to leave out TLS support when TLS is\n   disabled on the cmake command line.\n\n * Replace inline asm with attributes for __weak_reference macro\n\n * Add allocation attributes to malloc and stdio functions. This\n   allows the compiler to detect allocation related mistakes as well\n   as perform some additional optimizations. Bugs found by this change\n   were also addressed.\n\n * Add wchar_t support to tinystdio, eliminating the last missing\n   feature compared with the legacy stdio bits from newlib. With this,\n   libstdc++ can be built with wide char I/O support, eliminating the\n   last missing feature there as well.\n\n * Eliminate use of command line tools when building with a new enough\n   version of meson. Thanks to Michael Platings.\n\n * Add Microblaze support. Thanks to Alp Sayin.\n\n * Switch semihosting to use binary mode when opening files. Thanks to\n   Hardy Griech.\n\n * Build and install static library versions of the crt0 startup\n   code. These allows developers to reference them as libraries on the\n   command line instead of needing special compiler support to locate\n   the different variants, which is useful when using clang. Thanks to\n   Simon Tatham.\n\n * Simplify the signal/raise implementation to use a single global\n   array of signal handlers and to not use getpid and kill, instead\n   raise now directly invokes _exit. This makes using assert and abort\n   simpler and doesn't cause a large TLS block to be allocated. Thanks\n   to Joe Nelson for discovering the use of a TLS variable here.\n\n### Picolibc version 1.8\n\nWith the addition of nearly complete long double support in the math\nlibrary, it seems like it's time to declare a larger version increment\nthan usual.\n\n * Improve arc and xtensa support, adding TLS helpers and other build fixes\n\n * Fix FPSCR state for Arm8.1-M low overhead loops (thanks to David\n   Green)\n\n * Add -Werror=double-promotion to default error set and fix related\n   errors. (thanks to Ryan McClelland)\n\n * Fix locking bug in malloc out-of-memory path and freeing a locked\n   mutex in the tinystdio bufio code. These were found with lock\n   debugging code in Zephyr.\n\n * Add some missing functions in tinystdio, strto*l_l, remove,\n   tmpname/tmpfile which were published in stdio.h but not included in\n   the library.\n\n * Switch read/write functions to use POSIX types instead of legacy\n   cygwin types. This makes mapping to existing an POSIX api work\n   right.\n\n * Add %b support to tinystdio printf and scanf. These are disabled by\n   default as they aren't yet standardized.\n\n * Fix avr math function support. The avr version of gcc has modes\n   where double and long double are 32 or 64 bits, so the math library\n   code now detects all of that at compile time rather than build time\n   and reconfigures the functions to match the compiler types.\n\n * Add nearly complete long double support from openlibm for 80-bit\n   Intel and 128-bit IEEE values (in addition to supporting 64-bit\n   long doubles). Still missing are Bessel functions and decimal\n   printf/scanf support.\n\n * Add limited long double support for IBM 'double double' form. This\n   is enough to run some simple tests, but doesn't have any\n   significant math functions yet.\n\n * Get Power9 code running under qemu with OPAL. This was mostly\n   needed to validate the big-endian and exception code for 128-bit\n   long doubles, but was also used to validate the double double\n   support.\n\n * Provide times() and sysconf() implementations in semihosting. You\n   can now build and run the dhrystone benchmark without any further\n   code.\n\n * Fix use of TLS variables with stricter alignment requirements in\n   the default linker script and startup code. (thanks to Joakim\n   Nohlgård and Alexander Richardson who found this issue while\n   working on lld support).\n\n### Picolibc version 1.7.9\n\n * Support all Zephyr SDK targets\n\n * Support relocating the toolchain by using GCC_EXEC_PREFIX for\n   sysroot-install when compiler doesn't use sysroot.\n\n * Add MIPS, SPARC and ARC support\n\n * Deal with RISC-V changes in gcc that don't reliably include zicsr\n\n * Support Picolibc as default C library with -Dsystem-libc option.\n   With this, you can use picolibc without any extra compiler options.\n\n * Merge current newlib bits to get code that doesn't use struct _reent\n\n * Get rid of struct _reent in legacy stdio code\n\n * Support 16-bit int targets by fixing a few places assuming\n   sizeof(int) == 4, object sizes not using size_t, wint_t for\n   ucs-4 values\n\n * Add MSP430 support\n\n * Fix a couple of clang bugs (one on Cortex M0)\n\n * Support libc++ by adding non-standard mbstate_t.h\n\n * Merge i686 and x86_64 code to allow x86 multilib builds\n\n * Merge Xtensa newlib bits\n\n * Support Xtensa ESP32 targets\n\n * Add Nios II support\n\n### Picolibc version 1.7.8\n\n 1. Fix el/ix level 4 code type errors\n\n 2. Fix out-of-source CMake build (thanks Max Behensky)\n\n 3. Improve build.md docs (thanks Kalle Raiskila)\n\n 4. Fix cmake build for various architectures\n\n 5. Initialize lock in fdopen\n\n 6. Remove %M from linker paths in single-arch builds\n\n 7. Shrink tinystdio vfprintf and vfscanf a bit\n\n 8. Use -fno-builtin-malloc -fno-builtin-free (GCC 12 compat)\n\n 9. Use -fno-builtin-copysignl (GCC 12 compat)\n\n 10. Add _zicsr to -march for risc-v picocrt (binutils 2.38 compat)\n\n 11. Add -no-warn-rwx-segments to link spec (binutils 2.38 compat)\n\n### Picolibc version 1.7.7\n\n 1. Fix semihost gettimeofday, add a test.\n\n 2. Fix config option documentation. (Thanks to rdiez)\n\n 3. Document how re-entrant locking APIs are used. (Thanks to rdiez)\n\n 4. Fix some 16-bit int issues in tinystdio. (Thanks to Ayke van\n    Laethem)\n\n 5. Make header files a bit more POSIX compliant, installing rpc\n    headers, moving byte swapping macros to arpa/inet.h\n\n 6. Fix some stdio bugs found by Zephyr test suite: snprintf return\n    value on buffer overflow, add ftello/fseeko, fputc return value,\n    %0a formatting, clear EOF status after ungetc/fseek.\n\n 7. Re-do buffered I/O support to handle mixed read/write files\n    correctly. This adds setbuf, setbuffer, setlinebuf, setvbuf.\n\n 8. Add fmemopen and freopen.\n\n 9. Add enough cmake support to allow Zephyr to build picolibc as a\n    module using that, rather than meson.\n\n 10. Merge current newlib bits\n \n 11. Fix %p printf/scanf on ILP64 targets.\n\n### Picolibc version 1.7.6\n\n 1. Fix use with C++ applications caused by a syntax error in\n    picolibc.specs\n\n 2. Automatically include '-nostdlib' to options used while\n    evaluating build rules to ensure tests work as expected.\n\n 3. Publish aarch64 inline math functions, ensure that inline fma\n    functions work in installed applications for arm and risc-v.\n\n### Picolibc version 1.7.5\n\n 1. Fix build on big-endian systems (thanks to Thomas Daede)\n\n 2. Add m68k support (thanks to Thomas Daede).\n\n 3. Fix build issues with ARM Cortex-a9 target (thanks to Ilia\n    Sergachev).\n\n 4. Fix fwrite(x,0,y,z) in both tinystdio and legacy stdio. tinystdio\n    returned the wrong value and legacy stdio caused a divide-by-zero\n    fault.\n\n 5. Update Ryu code to match upstream (minor fixes)\n\n 6. Fix various __NEWLIB and __PICOLIBC macros; they were using a\n    single leading underscore instead of two (thanks to Vincent\n    Palatin).\n\n 7. Fix tinystdio error-handling bugs\n\n 8. Merge recent newlib changes (fixed ltdoa in legacy stdio)\n\n 9. Speed improvements for github CI system\n\n 10. Big-endian PowerPC support\n\n 11. Fail builds if most 'run_command' uses fail (thanks to Johan de\n     Claville Christiansen)\n\n 12. Positional parameters in tinystdio. With this, I think tinystdio\n     is feature complete.\n\n 13. Support for multiple build-styles of picolibc (minsize/release)\n     in one binary package. This still requires separate meson runs.\n\n 14. Testing with glibc test code. This uncovered numerous bugs,\n     mostly math errno/exception mistakes, but also a few serious\n     bugs, including a couple of places where the nano-malloc failed\n     to check for out-of-memory. Picolibc now passes all of the glibc\n     math tests except for jn, yn, lgamma and tgamma. The picolibc\n     versions of those functions are too inaccurate. Picolibc also\n     passes most other relevant glibc tests, including stdio,\n     string and stdlib areas.\n\n 15. Tinystdio version of fcvt now has a static buffer large enough to\n     hold the maximum return size.\n\n 16. Tinystdio versions of ecvtbuf and fcvtbuf have been replaced\n     with ecvt_r and fcvt_r equivalents, which take a 'len' parameter\n     to prevent buffer overruns.\n\n 17. Add the GeneratePicolibcCrossFile.sh script which provides a way\n     to isolate picolibc build scripts from the vagaries of meson\n     version shifts (thanks to R. Diez).\n\n 18. Add 'semihost' version of crt0 that calls 'exit' after main\n     returns. The ARM and RISC-V versions of this also include trap\n     handlers for exceptions that print out information and exit when\n     an exception occurs.\n\n### Picolibc version 1.7.4\n\n 1. Clean up meson build bits, including use of 'fs module (thanks to\n    Yasushi Shoji).\n\n 2. Speed up github actions by sharing Debian docker image (thanks to\n    Yasushi Shoji).\n\n 3. Reduce use of intermediate static libraries during build\n\n 4. Use standard Meson architecture names everywhere (thanks to\n    Yasushi Shoji).\n\n 5. Support building with -D_FORTIFY_SOURCE enabled.\n\n 6. Clean up 32-bit arm assembly code, eliminating __aeabi wrappers\n    where possible.\n\n 7. Add basename, dirname and fnmatch back.\n\n 8. Fix all old-style (K\u0026R) function definitions.\n\n 9. Enable lots more compiler warning flags.\n\n 10. Remove last uses of alloca in legacy stdio code.\n\n 11. Add tests from musl libc-testsuite. There aren't many tests, but\n     these identified a few bugs.\n\n 12. Add lots more exception and errno tests for the math functions.\n\n 13. Restructure math library to always use the `__math_err` functions\n     to raise exceptions and set errno. This removes the w_*.c wrapper\n     functions and eliminates the `__ieee names`. This centralizes\n     compiler work-arounds to ensure run-time evaluation of\n     expressions intended to raise exceptions. In the process, all of\n     the libm/math files were reformatted with clang-format.\n\n 14. Make tinystdio '%a' compatible with glibc, including supporting\n     rounding and trimming trailing zeros when possible.\n\n 15. Remove floating point exception generation code on targets\n     without floating point exception support. This reduces code size\n     on soft float machines without affecting results.\n\n### Picolibc version 1.7.3\n\n 1. Add -Wall -Wextra to default builds. Fixed warnings this raised.\n\n 2. Add htonl and friends (based on __htonl). Thanks to Johan de\n    Claville Christiansen\n\n 3. Set errno in scalbn and scalbnf (patch forwarded to newlib).\n\n 4. Merge newlib recent changes which includes a couple of libm fixes.\n\n### Picolibc version 1.7.2\n\n 1. Fix picolibc.ld to split C++ exceptions back apart (thanks to\n    Khalil Estell)\n\n 2. Add vsscanf to tinystdio (required for libstdc++).\n\n 3. Also stick -isystem in C++ compile command to try and get\n    picolibc headers to be used instead of newlib.\n\n### Picolibc version 1.7.1\n\n 1. Add __cxa_atexit implementation to 'picoexit' path as required by\n    C++\n\n 2. Fix lack of 'hh' support in integer-only tinystdio printf path.\n\n 3. Fix tinystdio __file flag initialization for C++ apps\n\n### Picolibc version 1.7\n\n 1. Merge libc and libm into a single library. Having them split\n    doesn't offer any advantages while requiring that applications add\n    '-lm' to link successfully. Having them merged allows use of libm\n    calls from libc code.\n\n 2. Add hex float format to *printf, *scanf and strto{d,f,ld}. This is\n    required for C99 support.\n\n 3. Unify strto{d,f,ld} and *scanf floating point parsing code. This\n    ensures that the library is consistent in how floats are parsed.\n\n 4. Make strto{d,f,ld} set errno to ERANGE on overflow/underflow,\n    including when the result is a subnormal number.\n\n### Picolibc version 1.6.2\n\n 1. Change `restrict` keyword in published headers to `__restrict` to\n    restore compatibility with applications building with --std=c18.\n\n 2. Additional cleanups in time conversion funcs (Thanks to R. Riez)\n\n### Picolibc version 1.6.1\n\n 1. Code cleanups for time conversion funcs (Thanks to R. Diez)\n\n 2. Add '-fno-stack-protector' when supported by the C compiler\n    to avoid trouble building with native Ubuntu GCC.\n\n 3. Bug fix for converting denorms with sscanf and strto{d,f,ld}.\n\n 4. Use __asm__ for inline asm code to allow building applications\n    with --std=c18\n\n 5. Fix exit code for semihosting 'abort' call to make it visible\n    to the hosting system.\n\n 6. Add strfromf and strfromd implementations. These are simple\n    wrappers around sscanf, but strfromf handles float conversions\n    without requiring a pass through 'double' or special linker hacks.\n\n### Picolibc version 1.6\n\n 1. Bugfix for snprintf(buf, 0) and vsnprintf(buf, 0) to avoid\n    smashing memory\n\n 2. Support building libstdc++ on top of picolibc\n\n 3. Add 'hosted' crt0 variant that calls exit when main\n    returns. This makes testing easier without burdening embedded apps\n    with unused exit processing code.\n\n 4. Add 'minimal' crt0 variant that skips constructors to\n    save space on systems known to not use any.\n\n 5. Fix HW floating point initialization on 32-bit ARM processors to\n    perform 'dsb' and 'isb' instructions to ensure the FPU enabling\n    write is complete before executing any FPU instructions.\n\n 6. Create a new '--picolibc-prefix' GCC command line parameter that\n    sets the base of all picolibc file names.\n\n 7. Add bare-metal i386 and x86_64 initializatiton code (thanks to\n    Mike Haertel). These initalize the processor from power up to\n    running code without requiring any BIOS.\n\n 8. Merge newlib as of late April, 2021\n\n 9. Add 'timegm' function (thanks to R. Diez).\n\n10. Fix a number of tinystdio bugs: handle fread with size==0, parse\n    'NAN' and 'INF' in fscanf in a case-insensitive manner, fix\n    negative precision to '*' arguments in printf, fix handling of\n    'j', 'z' and 't' argument size specifiers (thanks to Sebastian\n    Meyer).\n\n11. Make the fenv API more consistent and more conformant with the\n    spec. All architectures now fall back to the default code\n    for soft float versions, which avoids having the various exception\n    and rounding modes get defined when not supported.\n\n### Picolibc version 1.5.1\n\n 1. Make riscv crt0 '_exit' symbol 'weak' to allow linking without\n    this function.\n\n### Picolibc version 1.5\n\n 1. Make picolibc more compatible with C++ compilers.\n   \n 2. Add GCC specs file and linker script for building C++ applications\n    with G++ that enable exception handling by linking in call stack\n    information.\n\n 3. A few clang build fixes, including libm exception generation\n\n 4. Nano malloc fixes, especially for 'unusual' arguments\n\n 5. Merge in newlib 4.1.0 code\n\n 6. More libm exception/errno/infinity fixes, mostly in the gamma funcs.\n\n 7. Add tests for all semihost v2.0 functions.\n\n 8. A few RISC-V assembly fixes and new libm code.\n\n 9. Build fixes to reliably replace generic code with\n    architecture-specific implementations.\n\nWith a patch which is pending for GCC 11, we'll be able to build C++\napplications that use picolibc with exceptions and iostream.\n\n### Picolibc version 1.4.7\n\n 1. Fix numerous libm exception and errno bugs. The math functions are\n    all now verified to match the C19 and Posix standards in this\n    area.\n\n 2. Change behavior of 'gamma' function to match glibc which returns\n    lgamma for this function. Applications should not use this\n    function, they should pick either lgamma or tgamma as appropriate.\n \n 3. Fix fma/fmaf on arm and RISC-V so that the machine-specific versions\n    are used when the hardware has support. Also fix the math library\n    to only use fma/fmaf when it is supported by the hardware.\n\n 4. Fix numerous nano-malloc bugs, especially with unusual parameters.\n\n 5. Change nano-malloc to always clear returned memory.\n\n 6. Improve nano-realloc to perform better in various ways, including\n    merging adjacent free blocks and expanding the heap.\n\n 7. Add malloc tests, both a basic functional test and a stress test.\n\n 8. Improve build portability to Windows. Picolibc should now build\n    using mingw.\n\n 9. Use hardware TLS register on ARM when available.\n\n 10. Support clang compiler. Thanks to Denis Feklushkin\n     \u003cdenis.feklushkin@gmail.com\u003e and Joakim Nohlgård \u003cjoakim@nohlgard.se\u003e.\n\n 11. Avoid implicit float/double conversions. Check this by having\n     clang builds use -Wdouble-promotion -Werror=double-promotion\n     flags\n\n 12. Have portable code check for machine-specific overrides by\n     matching filenames. This avoids building libraries with\n     duplicate symbols and retains compatibility with newlib (which\n     uses a different mechanism for this effect).\n\n 13. Patches to support building with [CompCert](http://compcert.inria.fr/), a\n     formally verified compiler. Thanks to Sebastian Meyer\n     \u003cmeyer@absint.com\u003e.\n\n### Picolibc version 1.4.6\n\n 1. Install 'ssp' (stack smashing protection) header files. This fixes\n    compiling with -D_FORTIFY_SOURCE.\n\n 2. Make getc/ungetc re-entrant. This feature, which is enabled by\n    default, uses atomic instruction sequences that do not require\n    OS support.\n\n 3. Numerous iconv fixes, including enabling testing and switching\n    external CCS file loading to use stdio. By default, iconv provides\n    built-in CCS data for all of the supported encodings, which takes\n    a fairly large amount of read-only memory. Iconv is now always\n    included in picolibc as  it isn't included in applications unless\n    explicitly referenced by them.\n\n 4. Add __getauxval stub implementation to make picolibc work with\n    GCC version 10 compiled for aarch64-linux-gnu.\n\n 5. Change how integer- and float- only versions of printf and scanf\n    are selected. Instead of re-defining the symbols using the C\n    preprocessor, picolibc now re-defines the symbols at link\n    time. This avoids having applications compiled with a mixture of\n    modes link in multiple versions of the underlying functions, while\n    still preserving the smallest possible integer-only\n    implementation.\n\n 6. Document how to use picolibc on a native POSIX system for\n    testing. Check out the [os.md](doc/os.md) file for details.\n\n 7. Merge current newlib bits in. This includes better fenv support,\n    for which tests are now included in the picolibc test suite.\n\n### Picolibc version 1.4.5\n\n 1. Fix section order in picolibc.ld to give applications correct\n    control over the layout of .preserve, .init and .fini regions.\n\n 2. Add startup and TLS support for aarch64 and non Cortex-M 32-bit\n    arm.\n\n### Picolibc version 1.4.4\n\n 1. Fix floating point 'g' format output in tinystdio. (e.g.,\n    for 10.0, print '10' instead of '1e+01'). There are tests which\n    verify a range of 'g' cases like these now.\n    \n 2. Merge current newlib bits. The only thing which affects picolibc\n    is the addition of fenv support for arm.\n\n### Picolibc version 1.4.3\n\n 1. Make fix for CVE 2019-14871 - CVE 2019-14878 in original newlib\n    stdio code not call 'abort'. Allocation failures are now reported\n    back to the application.\n\n 2. Add 'exact' floating point print/scan code to tinystdio. Thanks\n    to Sreepathi Pai for pointing me at the Ryu code by Ulf\n    Adams.\n\n 3. Add regular expression functions from newlib. These were removed\n    by accident while removing POSIX filesystem-specific code.\n\n 4. Make tinystdio versions of [efg]cvt functions. This means that the\n    default tinystdio version of picolibc no longer calls malloc from\n    these functions.    \n\n 5. More clang-compatibility fixes. (Thanks to Denis Feklushkin)\n\n 6. Remove stdatomic.h and tgmath.h. (they should not be provide by picolibc)\n\n### Picolibc version 1.4.2\n\n 1. Clang source compatibility. Clang should now be able to compile\n    the library. Thanks to Denis Feklushkin for figuring out how\n    to make this work.\n\n 2. aarch64 support. This enables the existing aarch64 code and\n    provides an example configuration file for getting it\n    built.  Thanks for Anthony Anderson for this feature.\n\n 3. Testing on github on push and pull-request. For now, this is\n    limited to building the library due to a bug in qemu.\n\n 4. Get newlib stdio working again. You can now usefully use Newlib's\n    stdio. This requires a working malloc and is substantially larger\n    than tinystdio, but has more accurate floating point input. This\n    requires POSIX functions including read, write and a few others.\n\n 5. Fix long double strtold. The working version is only available\n    when using tinystdio; if using newlib stdio, strtold is simply not\n    available.\n\n 6. Improve tinystdio support for C99 printf/scanf additions.\n\n 7. Check for correct prefix when sysroot-install option is\n    selected. The value of this option depends on how gcc was\n    configured, and (alas) meson won't let us set it at runtime, so\n    instead we complain if the wrong value was given and display the\n    correct value.\n\n 8. Sync up with current newlib head.\n\n### Picolibc version 1.4.1\n\nThis release contains an important TLS fix for ARM along with a few\nminor compatibility fixes\n\n 1. Make __aeabi_read_tp respect ARM ABI register requirements to\n    avoid clobbering register contents during TLS variable use.\n\n 2. Use cpu_family instead of cpu in meson config, which is 'more\n    correct' when building for a single cpu instead of multilib.\n\n 3. Make arm sample interrupt vector work with clang\n\n 4. Use __inline instead of inline in published headers to allow\n    compiling with -ansi\n\n 5. Make 'naked' RISC-V _start function contain only asm\n    statements as required by clang (and recommended by gcc).\n\n 6. Use -msave-restore in sample RISC-V cross-compile\n    configuration. This saves text space.\n\n### Picolibc version 1.4\n\nThis release was focused on cleaning up the copyright and license\ninformation.\n\n 1. Copyright information should now be present in every source file.\n\n 2. License information, where it could be inferred from the\n    repository, was added to many files.\n\n 3. 4-clause BSD licenses were changed (with permission) to 3-clause\n\n 4. Fix RISC-V ieeefp.h exception bits\n\n 5. Merge past newlib 3.2.0\n\n 6. Add PICOLIBC_TLS preprocessor define when the library has TLS support\n\n### Picolibc version 1.3\n\nThis release now includes tests, and fixes bugs found by them.\n\n 1. ESP8266 support added, thanks to Jonathan McDowell.\n\n 2. Numerous test cases from newlib have been fixed, and\n    precision requirements adjusted so that the library now\n    passes its own test suite on x86, RISC-V and ARM.\n\n 3. String/number conversion bug fixes. This includes fcvt/ecvt/gcvt\n    shared with newlib and tinystdio printf/scanf\n\n 4. A few RISC-V ABI fixes, including setting the TLS base correctly,\n    compiling with -mcmodel=medany, and enabling the FPU for libraries\n    built to use it.\n\n 5. Semihosting updates, including adding unlink, kill and getpid\n    (which are used by some tests).\n\n### Picolibc version 1.2\n\nThis release includes important fixes in picolibc.ld and more\nsemihosting support.\n\n 1. File I/O and clock support for semihosting. This enables fopen/fdopen\n    support in tinystdio along with an API to fetch a real time clock\n    value.\n\n 2. Fix picolibc.ld to not attempt to use redefined symbols for memory\n    space definitions. These re-definitions would fail and the default\n    values be used for system memory definitions. Instead, just use\n    the ? : operators each place the values are needed. Linker scripts\n    continue to mystify.\n\n 3. Expose library definitions in 'picolibc.h', instead of 'newlib.h'\n    and '_newlib_version.h'\n\n 4. Define HAVE_SEMIHOST when semihosting support is available. This\n    lets the 'hello-world' example do some semihost specific things.\n\n### Picolibc version 1.1\n\nA minor update from 1.0, this release includes:\n\n 1. semihost support. This adds console I/O and exit(3) support on ARM\n    and RISC-V hosts using the standard semihosting interfaces.\n\n 2. Posix I/O support in tinystdio. When -Dposix-io=true is included\n    in the meson command line (which is the default), tinystdio adds\n    support for fopen and fdopen by using malloc, open, close, read,\n    write and lseek. If -Dposix-console=true is also passed to meson,\n    then picolibc will direct stdin/stdout/stderr to the posix\n    standard file descriptors (0, 1, 2).\n\n 3. Merge recent upstream newlib code. This brings picolibc up to date\n    with current newlib sources.\n\n 4. Hello world example. This uses a simple Makefile to demonstrate\n    how to us picolibc when installed for ARM and RISC-V embedded\n    processors. The resulting executables can be run under qemu.\n\n 5. Remove newlib/libm/mathfp directory. This experimental code never\n    worked correctly anyways.\n\n### Picolibc version 1.0\n\nThis is the first release of picolibc. Major changes from newlib\ninclude:\n\n 1. Remove all non-BSD licensed code. None of it was used in building\n    the embedded library, and removing it greatly simplifies the\n    license situation.\n\n 2. Move thread-local values to native TLS mechanism\n\n 3. Add smaller stdio from avr-libc, which is enabled by default\n\n 4. Switch build system to meson. This has two notable benefits; the first\n    is that building the library is much faster, the second is that\n    it isolates build system changes from newlib making merging of\n    newlib changes much easier.\n\n 5. Add simple startup code. This can be used in environments that\n    don't have complicated requirements, allowing small applications\n    to avoid needing to figure this out.\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fpicolibc%2Fpicolibc","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fpicolibc%2Fpicolibc","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fpicolibc%2Fpicolibc/lists"}