ladybird/Toolchain/Patches/llvm

Patches for llvm on SerenityOS

0001-Support-Add-support-for-building-LLVM-on-SerenityOS.patch

Add support for building LLVM on SerenityOS

Adds SerenityOS #ifdefs for platform-specific code.

We stub out wait4, as SerenityOS doesn't support querying a child process's resource usage information.

0002-Triple-Add-triple-for-SerenityOS.patch

Add triple for SerenityOS

0003-Driver-Add-support-for-SerenityOS.patch

Add support for SerenityOS

Adds support for the $arch-pc-serenity target to the Clang front end. This makes the compiler look for libraries and headers in the right places, and enables some security mitigations like stack-smashing protection and position-independent code by default.

0004-Driver-Default-to-ftls-model-initial-exec-on-Serenit.patch

Default to -ftls-model=initial-exec on SerenityOS

This is a hack to make Clang use the initial-exec TLS model instead of the default local-exec when building code for Serenity.

This patch should be removed when we implement proper TLS support.

0005-libc-Add-support-for-SerenityOS.patch

Add support for SerenityOS

This commit teaches libc++ about what features are available in our LibC, namely:

• We do not have locale support, so no-op shims should be used in place of the C locale API.
• The number of errno constants defined by us is given by the value of the ELAST macro.
• Multithreading is implemented though the pthread library.
• Use libc++'s builtin character type table instead of the one provided by LibC as there's a lot of extra porting work to convince the rest of locale.cpp to use our character type table properly.

0006-compiler-rt-Build-crtbegin.o-crtend.o-for-SerenityOS.patch

Build crtbegin.o/crtend.o for SerenityOS

0007-cmake-Allow-undefined-symbols-on-SerenityOS.patch

Allow undefined symbols on SerenityOS

Allow undefined symbols in LLVM libraries, which is needed because only stubs are available for SerenityOS libraries when libc++ and libunwind are built.

0008-cmake-Support-building-shared-libLLVM-and-libClang-f.patch

Support building shared libLLVM and libClang for SerenityOS

This patch tells CMake that the --whole-archive linker option should be used for specifying the archives whose members will constitute these shared libraries.

Symbol versioning is disabled, as the SerenityOS loader doesn't support it, and the ELF sections that store version data would just waste space.

0009-compiler-rt-llvm-Enable-profile-instrumentation-for-.patch

Enable profile instrumentation for SerenityOS

Treat SerenityOS the same as other *NIX platforms that behave close enough to linux to use the pre-canned InstrProfiling implementation.

Curiously, enabling profiling for the SerenityOS target changes the ELF OS ABI for userspace binaries to 3, or GNU/Linux.

0010-Add-SerenityOS-to-config.guess.patch

Add SerenityOS to config.guess

0011-llvm-Prevent-the-use-of-POSIX-shm-on-SerenityOS.patch

Prevent the use of POSIX shm on SerenityOS

POSIX shm is not supported by SerenityOS yet, so this causes a compilation error.