[llvm] [Cygwin] Define LLVM_ABI for Cygwin (PR #143222)

Fri Jun 13 13:54:08 PDT 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `flang-arm64-windows-msvc` running on `linaro-armv8-windows-msvc-01` while building `llvm` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/207/builds/2550

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 5 (build-unified-tree) failure: build (failure)
...
349.233 [2601/10/4118] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/char-set.cpp.obj
349.657 [2600/10/4119] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/cmake_pch.cxx.obj
350.902 [2599/10/4120] Building AArch64GenInstrInfo.inc...
351.803 [2598/10/4121] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/char-buffer.cpp.obj
352.846 [2597/10/4122] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/debug-parser.cpp.obj
352.883 [2596/10/4123] Building AArch64GenSubtargetInfo.inc...
353.119 [2595/10/4124] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/characters.cpp.obj
353.813 [2594/10/4125] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/instrumented-parser.cpp.obj
356.204 [2593/10/4126] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/message.cpp.obj
358.640 [2592/10/4127] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/preprocessor.cpp.obj
FAILED: tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/preprocessor.cpp.obj 
ccache C:\Users\tcwg\scoop\apps\llvm-arm64\current\bin\clang-cl.exe  /nologo -TP -DFLANG_INCLUDE_TESTS=1 -DGTEST_HAS_RTTI=0 -DUNICODE -D_CRT_NONSTDC_NO_DEPRECATE -D_CRT_NONSTDC_NO_WARNINGS -D_CRT_SECURE_NO_DEPRECATE -D_CRT_SECURE_NO_WARNINGS -D_GLIBCXX_ASSERTIONS -D_HAS_EXCEPTIONS=0 -D_SCL_SECURE_NO_DEPRECATE -D_SCL_SECURE_NO_WARNINGS -D_UNICODE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -IC:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/build/tools/flang/lib/Parser -IC:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/llvm-project/flang/lib/Parser -IC:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/llvm-project/flang/include -IC:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/build/tools/flang/include -IC:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/build/include -IC:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/llvm-project/llvm/include -imsvcC:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/llvm-project/flang/../mlir/include -imsvcC:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/build/tools/mlir/include -imsvcC:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/build/tools/clang/include -imsvcC:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/llvm-project/llvm/../clang/include /DWIN32 /D_WINDOWS   /Zc:inline /Zc:__cplusplus /Oi /Brepro /bigobj /permissive- -Werror=unguarded-availability-new /W4  -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported /Gw -Wno-deprecated-copy -Wno-string-conversion -Wno-ctad-maybe-unsupported -Xclang -fno-pch-timestamp /O2 /Ob2  -std:c++17 -MD  /EHs-c- /GR- -UNDEBUG /YuC:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/build/tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/cmake_pch.hxx /FpC:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/build/tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/./cmake_pch.cxx.pch /FIC:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/build/tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/cmake_pch.hxx /showIncludes /Fotools/flang/lib/Parser/CMakeFiles/FortranParser.dir/preprocessor.cpp.obj /Fdtools\flang\lib\Parser\CMakeFiles\FortranParser.dir\FortranParser.pdb -c -- C:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/llvm-project/flang/lib/Parser/preprocessor.cpp
fatal error: file 'C:\Users\tcwg\llvm-worker\flang-arm64-windows-msvc\llvm-project\llvm\include\llvm\Support\Compiler.h' has been modified since the precompiled header 'C:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/build/tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/./cmake_pch.cxx.pch' was built: size changed (was 27102, now 27125)
note: please rebuild precompiled header 'C:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/build/tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/./cmake_pch.cxx.pch'
1 error generated.
362.302 [2592/9/4128] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/prescan.cpp.obj
363.549 [2592/8/4129] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/parsing.cpp.obj
364.042 [2592/7/4130] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/parse-tree.cpp.obj
366.546 [2592/6/4131] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/expr-parsers.cpp.obj
371.513 [2592/5/4132] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/io-parsers.cpp.obj
380.525 [2592/4/4133] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/openacc-parsers.cpp.obj
385.300 [2592/3/4134] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/executable-parsers.cpp.obj
397.391 [2592/2/4135] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/Fortran-parsers.cpp.obj
409.660 [2592/1/4136] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/openmp-parsers.cpp.obj
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/143222