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cc on Windows-Clang
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Using zig cc with CMake on Windows was failing during compiler
detection. -nostdinc was causing the crt not to be linked, and Coff/lld.zig
assumed that wWinMainCRTStartup would be present in this case.
-nostdlib did not prevent the default behaviour of linking libc++ when
zig c++ was used. This caused libc++ to be built when CMake ran
ABI detection using zig c++, which fails as libcxxabi cannot compile
under MSVC.
- Change the behaviour of COFF -nostdinc to set /entry to the function that the
default CRT method for the specified subsystem would have called.
- Fix -ENTRY being passed twice if it was specified explicitly and -nostdlib was present.
- Add support for /pdb, /version, /implib, and /subsystem as linker args (passed by CMake)
- Remove -Ddisable-zstd, no longer needed
- Add -Ddisable-libcpp for use when bootstrapping on msvc
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- add support for passing through .def files to the linker,
required for building libLTO.dll in LLVM
- fixup libcpp linking conditionals
- add option to skip linking zstd for use in bootstrapping (when
building against an LLVM with LLVM_ENABLE_ZSTD=OFF)
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After this commit, the self-hosted compiler does not offer the option to
use stage1 as a backend anymore.
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Closes #7484. Right now for UEFI targets an alignment
of 32 is being used for no reason other than support
a rare bytecode. As this is far from the standard case,
removing this alignment and using the default one,
as most toolchains do, should be the desired behavior.
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There was no check for linker errors after flushing,
which meant that if the link failed the build would
continue and try to copy the non-existant exe, and
also write the manifest as if it had succeeded.
Also adds parsing of lld output, which is surfaced at the
end of the compilation with the other errors instead
of via stderr
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On Windows, lld-link resolves PDB output paths using `/` and embeds the
result in the final executable, which breaks some native tooling like
WPR/WPA. This commit overrides the default behavior of lld-link by
explicitly setting the output PDB filename and binary-embedded path.
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