Fix SwiftShader's libEGL build under ThinLTO.

Linking of the SwiftShader's flavor requires
the linker to be too smart (there's a heavy reliance on
garbage collecting unused symbols, for which there is
no guarantees in the general case). In ThinLTO case,
garbage collection is still not as sofisticated, as in
other cases, so it fails to link the target complaining
about undefined symbols.

The workaround is to prevent Clang from splitting the
bitcode files in the question into two, and making the
GC problem a bit easier.

Eventually, ThinLTO might get a better GC, but it might
be a good idea to not rely on this feature in the source
code. At least, no other targets in Chromium do.


Change-Id: Ib44f65c4825cc3f6cd24695738a71ca4661f0bfb
Tested-by: Ivan Krasin <>
Reviewed-by: Nicolas Capens <>
1 file changed
tree: efa4dbb4cf0b1afcaed803a14def2a33bc8bc1ae
  1. .dir-locals.el
  2. .gitignore
  3. .gitmodules
  4. AUTHORS.txt
  7. CMakeLists.txt
  10. DEPS
  11. LICENSE.txt
  12. OWNERS
  15. README.version
  16. SwiftShader.sln
  17. docs/
  18. include/
  19. src/
  20. tests/
  21. third_party/



SwiftShader is a high-performance CPU-based implementation of the OpenGL ES and Direct3D 9 graphics APIs12. Its goal is to provide hardware independence for advanced 3D graphics.


The SwiftShader libraries act as drop-in replacements for graphics drivers.

On Windows, most applications can be made to use SwiftShader's DLLs by placing them in the same folder as the executable. On Linux, the LD_LIBRARY_PATH environment variable or -rpath linker option can be used to direct applications to search for shared libraries in the indicated directory first.

Prebuilt binaries can be found at:


See CONTRIBUTING.txt for important contributing requirements.

The canonical repository for SwiftShader is hosted at:

All changes must be reviewed and approved in the Gerrit review tool at:

Authenticate your account here:

All changes require a Change-ID tag in the commit message. A commit hook may be used to add this tag automatically, and can be found at: To clone the repository and install the commit hook in one go:

git clone && (cd SwiftShader && curl -Lo `git rev-parse --git-dir`/hooks/commit-msg ; chmod +x `git rev-parse --git-dir`/hooks/commit-msg)

Changes are uploaded to Gerrit by performing:

git push origin HEAD:refs/for/master


See docs/


Public mailing list:

Bug tracker:


The SwiftShader project is licensed under the Apache License Version 2.0. You can find a copy of it in LICENSE.txt.

Files in the third_party folder are subject to their respective license.

Authors and Contributors

The legal authors for copyright purposes are listed in AUTHORS.txt.

CONTRIBUTORS.txt contains a list of names of individuals who have contributed to SwiftShader. If you‘re not on the list, but you’ve signed the Google CLA and have contributed more than a formatting change, feel free to request to be added.


  1. Trademarks are the property of their respective owners.
  2. We do not claim official conformance with any graphics APIs at this moment.
  3. This is not an official Google product.