zig cc: expose clang precompiled C header support #18600
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see https://releases.llvm.org/17.0.1/tools/clang/docs/UsersManual.html#generating-a-pch-file syntax examples: `zig cc -x c-header test.h -o test.pch` `zig cc -include-pch test.pch main.c` `zig c++ -x c++-header test.h -o test.pch` `zig c++ -include-pch test.pch main.cpp`
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see https://releases.llvm.org/17.0.1/tools/clang/docs/UsersManual.html#generating-a-pch-file
syntax examples:
zig cc -x c-header test.h -o test.pchzig cc -include-pch test.pch main.czig c++ -x c++-header test.h -o test.pchzig c++ -include-pch test.pch main.cppcompiling
moldnow works:CC="zig cc" CXX="zig c++" ASM="zig cc" cmake .. -G Ninja && ninjacloses #18343
extracted from #17956 as a first step.