https://github.com/matveyt/nocrt0

Custom C startup code for GCC/MinGW
https://github.com/matveyt/nocrt0

gcc mingw startup windows

Last synced: about 1 month ago
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Custom C startup code for GCC/MinGW

• Host: GitHub
• URL: https://github.com/matveyt/nocrt0
• Owner: matveyt
• License: bsd-2-clause
• Created: 2018-01-01T21:34:23.000Z (about 7 years ago)
• Default Branch: master
• Last Pushed: 2024-11-17T10:43:55.000Z (about 2 months ago)
• Last Synced: 2024-11-17T11:34:46.585Z (about 2 months ago)
• Topics: gcc, mingw, startup, windows
• Language: C
• Homepage:
• Size: 23.4 KB
• Stars: 3
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
nocrt0

======

Summary

-------

Custom C startup code (mainCRTStartup) implementation for GCC/MinGW.

Description

-----------

*Nocrt0* is a custom C startup code without any dependencies of the standard C runtime

libraries. It is intended for building very small executable files under OS Windows(R).

*Nocrt0* was successfully tested with *GCC/MinGW*, *Pelles C* and *TinyCC*.

Using nocrt0

------------

There are two modules: *nocrt0w* for GUI applications, and *nocrt0c* for console

applications. Simply add the correct file into your project and build it without linking

to the default C startup code (hint: for GCC you will need `-nostartfiles` or `-nostdlib`

option). Alternatively, you can #include it right into any of your other C source files.

The process of building *nocrt0* can also be controlled with the following DEFINEs:

    -D_UNICODE

    -DNOSTDLIB

    -DARGV={builtin | msvcrt | shell32 | none}

`-D_UNICODE` builds "wide" version of the startup code (`wmain` or `wWinMain`).

`-DNOSTDLIB` when defined compiles built-in implementation of `_alloca()` and

`__chkstk()`. You might need it if you don't link with *libgcc.a*.

`-DARGV` is used for a console application (nocrt0c) only. It selects the type of the

underlying implementation of the standard command-line parser (argc/argv). `builtin`

(default) is the built-in implementation; `msvcrt` makes use of an external function

`__getmainargs()` (which is normally imported from *msvcrt.dll*); `shell32` relies on

`CommandLineToArgvW()` function from *shell32.dll*; `none` is for applications that do

not need any command-line processing (`int main(void)`).