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GH-131035: Use -flto=thin for clang-cl on Windows (GH-131036)

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Chris Eibl 2025-03-10 17:47:45 +01:00 • committed by GitHub
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Misc/NEWS.d/next/Build/2025-03-10-10-52-25.gh-issue-131035.KF1w4j.rst Normal file
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Use ``-flto=thin`` for faster build times using clang-cl on Windows. Patch by
Chris Eibl.

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PCbuild/pyproject-clangcl.props
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<AdditionalOptions>-Wno-deprecated-non-prototype -Wno-unused-label -Wno-pointer-sign -Wno-incompatible-pointer-types-discards-qualifiers -Wno-unused-function %(AdditionalOptions)</AdditionalOptions>
<AdditionalOptions Condition="'$(Platform)' == 'Win32'">-m32 %(AdditionalOptions)</AdditionalOptions>
<AdditionalOptions Condition="'$(Platform)' == 'x64'">-m64 %(AdditionalOptions)</AdditionalOptions>
<AdditionalOptions Condition="$(Configuration) != 'Debug'">-flto %(AdditionalOptions)</AdditionalOptions>
<AdditionalOptions Condition="$(Configuration) != 'Debug'">-flto=thin %(AdditionalOptions)</AdditionalOptions>
<AdditionalOptions Condition="$(SupportPGO) and $(Configuration) == 'PGInstrument'">-fprofile-instr-generate=$(_CLANG_PROFILE_PATH)$(TargetName)_%m.profraw %(AdditionalOptions)</AdditionalOptions>
<AdditionalOptions Condition="$(SupportPGO) and $(Configuration) == 'PGUpdate'">-fprofile-instr-use=$(OutDir)instrumented\profdata.profdata -Wno-profile-instr-unprofiled %(AdditionalOptions)</AdditionalOptions>
</ClCompile>