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Toolchain+Ports: Split the GCC patches

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This shouldn't cause any breaking changes, so a toolchain rebuild is not
required.

As per Hendiadyoin's request, math errno is disabled by default, which
should enable some extra compiler optimizations in LibGL and LibSoftGPU
code that uses math functions heavily.

Co-Authored-By: Ali Mohammad Pur <mpfard@serenityos.org>
This commit is contained in:
Daniel Bertalan 2022-05-17 09:52:17 +04:30 • committed by Ali Mohammad Pur
parent 83aa5dcbf6
commit d0edf2627c
15 changed files with 538 additions and 347 deletions
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Toolchain/Patches/gcc/ReadMe.md Normal file
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# Patches for gcc on SerenityOS
## `0001-Add-a-gcc-driver-for-SerenityOS.patch`
Add a gcc driver for SerenityOS
This patch adds support for the `*-*-serenity` target to gcc.
It specifies which flags need to be passed to the linker, defines the
__serenity__ macro, sets the correct underlying type of `size_t` and
`ptrdiff_t`, and enables IFUNCs.
## `0002-fixincludes-Skip-for-SerenityOS-targets.patch`
fixincludes: Skip for SerenityOS targets
`fixincludes` is responsible for fixing mistakes in system headers that
rely in compiler extensions that GCC doesn't support or cause errors in
C++ mode.
Our headers don't have such problems, so this hack is of no use for us.
## `0003-libgcc-Build-for-SerenityOS.patch`
libgcc: Build for SerenityOS
This patch enables building gcc's own C runtime files, and sets up
exception handling support.
## `0004-libgcc-Do-not-link-libgcc_s-to-LibC.patch`
libgcc: Do not link libgcc_s to LibC
The toolchain is built before LibC, so linking to the C runtime library
would fail.
## `0005-i386-Disable-math-errno-for-SerenityOS.patch`
i386: Disable math errno for SerenityOS
SerenityOS uses exceptions for math error handling, which allows the
compiler to do more optimizations on calls to math functions. This patch
has the effect of setting -fno-math-errno by default.
## `0006-libstdc-Support-SerenityOS.patch`
libstdc++: Support SerenityOS
During the toolchain build, SerenityOS libraries are not available, so
we have to manually tell libstdc++ about what our LibC supports.
In most places, we take the Newlib code paths.