https://github.com/yugr/symbolhider

A tool which hides symbols exported from shared libraries or relocatable object files
https://github.com/yugr/symbolhider

abi shared-library visibility

Last synced: 11 days ago
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A tool which hides symbols exported from shared libraries or relocatable object files

• Host: GitHub
• URL: https://github.com/yugr/symbolhider
• Owner: yugr
• License: mit
• Created: 2022-01-04T12:29:05.000Z (over 3 years ago)
• Default Branch: master
• Last Pushed: 2023-04-29T12:59:07.000Z (almost 2 years ago)
• Last Synced: 2025-03-25T09:52:59.281Z (28 days ago)
• Topics: abi, shared-library, visibility
• Language: C
• Homepage:
• Size: 33.2 KB
• Stars: 36
• Watchers: 4
• Forks: 2
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.txt

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# What's this?

SymbolHider is a simple tool which hides symbols in ELF shared library's public interface

(by rewriting their visibility to `hidden`).

The tool is inspired by @EmployedRussian suggestion in [Is there any way to override the -fvisibility=hidden at link time?](https://stackoverflow.com/questions/36273404/is-there-any-way-to-override-the-fvisibility-hidden-at-link-time) although I also enabled it for a more common case of fully linked binaries.

# How to use

To hide some symbols in a library, run tool like

```

$ sym-hider libxyz.so foo bar

```

To instead _unhide_ some symbols, run tool like

```

$ sym-hider --unhide file.o foo bar

```

(usually this will not work for already linked files i.e. executables and shlibs).

For more details run

```

$ sym-hider -h

```

# TODO

* Support 32-bit ELFs

* Support DLL and Mach-O (is it possible?)

* Hide by wildcards

* More tests

* Support static libs (?)

* Warn on missing symbols