[flang-commits] [flang] [llvm] [CMake] Enable warnings for PCH (PR #176566)

[LLVM Continuous Integration via flang-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `sanitizer-ppc64le-linux` running on `ppc64le-sanitizer` while building `flang,llvm` at step 2 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/72/builds/16989

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

```
Step 2 (annotate) failure: 'python ../sanitizer_buildbot/sanitizers/zorg/buildbot/builders/sanitizers/buildbot_selector.py' (failure) (timed out)
...
[2519/2526] Linking CXX static library /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/powerpc64le-unknown-linux-gnu/libc++.a
[2520/2526] Building ASM object compiler-rt/lib/asan/CMakeFiles/RTAsan_dynamic.powerpc64le.dir/asan_interceptors_vfork.S.o
[2521/2526] Linking CXX shared library /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/clang/23/lib/powerpc64le-unknown-linux-gnu/libclang_rt.asan.so
[2522/2526] Building ASM object compiler-rt/lib/tsan/rtl/CMakeFiles/clang_rt.tsan-dynamic-powerpc64le.dir/tsan_rtl_ppc64.S.o
[2523/2526] Linking CXX shared library /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/clang/23/lib/powerpc64le-unknown-linux-gnu/libclang_rt.tsan.so
[2524/2526] Building ASM object compiler-rt/lib/orc/CMakeFiles/RTOrc.powerpc64le.dir/elfnix_tls.systemz.S.o
[2525/2526] Linking CXX static library compiler-rt/lib/orc/tests/libRTOrc.test.powerpc64le.a
[2526/2526] Linking CXX static library /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/clang/23/lib/powerpc64le-unknown-linux-gnu/liborc_rt.a
[4361/4363] No install step for 'runtimes'
[4363/4363] Completed 'runtimes'
command timed out: 1800 seconds without output running [b'python', b'../sanitizer_buildbot/sanitizers/zorg/buildbot/builders/sanitizers/buildbot_selector.py'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=6258.924168
Step 10 (build compiler-rt tsan_debug) failure: build compiler-rt tsan_debug (failure)
...
[2484/2526] Building ASM object libunwind/src/CMakeFiles/unwind_shared_objects.dir/UnwindRegistersRestore.S.o
[2485/2526] Building ASM object libunwind/src/CMakeFiles/unwind_shared_objects.dir/UnwindRegistersSave.S.o
[2486/2526] Building CXX object libcxx/src/CMakeFiles/cxx_shared.dir/algorithm.cpp.o
[2487/2526] Building CXX object libcxx/src/CMakeFiles/cxx_shared.dir/atomic.cpp.o
[2488/2526] Building CXX object libcxx/src/CMakeFiles/cxx_shared.dir/future.cpp.o
[2489/2526] Building CXX object libcxx/src/CMakeFiles/cxx_shared.dir/random.cpp.o
[2490/2526] Building CXX object libcxx/src/CMakeFiles/cxx_shared.dir/ios.instantiations.cpp.o
[2491/2526] Building CXX object libcxx/src/CMakeFiles/cxx_shared.dir/iostream.cpp.o
[2492/2526] Building CXX object libcxx/src/CMakeFiles/cxx_shared.dir/locale.cpp.o
[2493/2526] Building ASM object libunwind/src/CMakeFiles/unwind_static_objects.dir/UnwindRegistersRestore.S.o
[2494/2526] Linking C shared library /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/powerpc64le-unknown-linux-gnu/libunwind.so.1.0
[2495/2526] Creating library symlink /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/powerpc64le-unknown-linux-gnu/libunwind.so.1 /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/powerpc64le-unknown-linux-gnu/libunwind.so
[2496/2526] Linking CXX shared library /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/powerpc64le-unknown-linux-gnu/libc++abi.so.1.0
[2497/2526] Creating library symlink /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/powerpc64le-unknown-linux-gnu/libc++abi.so.1 /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/powerpc64le-unknown-linux-gnu/libc++abi.so
[2498/2526] Linking CXX shared library /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/powerpc64le-unknown-linux-gnu/libc++.so.1.0
[2499/2526] Creating library symlink /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/powerpc64le-unknown-linux-gnu/libc++.so.1 /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/powerpc64le-unknown-linux-gnu/libc++.so
[2500/2526] Linking CXX static library /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/powerpc64le-unknown-linux-gnu/libc++experimental.a
[2501/2526] Building ASM object compiler-rt/lib/tsan/rtl/CMakeFiles/clang_rt.tsan-powerpc64le.dir/tsan_rtl_ppc64.S.o
[2502/2526] Linking CXX static library /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/clang/23/lib/powerpc64le-unknown-linux-gnu/libclang_rt.tsan.a
[2503/2526] Generating exported symbols for clang_rt.tsan-powerpc64le
[2504/2526] Building ASM object compiler-rt/lib/xray/CMakeFiles/RTXray.powerpc64le.dir/xray_trampoline_powerpc64_asm.S.o
[2505/2526] Linking CXX static library /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/clang/23/lib/powerpc64le-unknown-linux-gnu/libclang_rt.xray.a
[2506/2526] Building ASM object compiler-rt/lib/orc/CMakeFiles/RTOrc.powerpc64le.dir/elfnix_tls.aarch64.S.o
[2507/2526] Building ASM object compiler-rt/lib/orc/CMakeFiles/RTOrc.powerpc64le.dir/elfnix_tls.x86-64.S.o
[2508/2526] Building ASM object compiler-rt/lib/orc/CMakeFiles/RTOrc.powerpc64le.dir/elfnix_tls.ppc64.S.o
[2509/2526] Building ASM object compiler-rt/lib/orc/CMakeFiles/RTOrc.powerpc64le.dir/sysv_reenter.arm64.S.o
[2510/2526] Building ASM object compiler-rt/lib/orc/CMakeFiles/RTOrc.powerpc64le.dir/sysv_reenter.x86-64.S.o
[2511/2526] Building ASM object compiler-rt/lib/asan/CMakeFiles/RTAsan.powerpc64le.dir/asan_interceptors_vfork.S.o
[2512/2526] Linking CXX static library /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/clang/23/lib/powerpc64le-unknown-linux-gnu/libclang_rt.asan.a
[2513/2526] Generating exported symbols for clang_rt.asan-powerpc64le
[2514/2526] Generating version list for clang_rt.asan-dynamic-powerpc64le
[2515/2526] Building CXX object compiler-rt/lib/asan/CMakeFiles/RTAsan_dynamic_version_script_dummy.powerpc64le.dir/dummy.cpp.o
[2516/2526] Building ASM object libunwind/src/CMakeFiles/unwind_static_objects.dir/UnwindRegistersSave.S.o
[2517/2526] Linking C static library /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/powerpc64le-unknown-linux-gnu/libunwind.a
[2518/2526] Linking CXX static library /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/powerpc64le-unknown-linux-gnu/libc++abi.a
[2519/2526] Linking CXX static library /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/powerpc64le-unknown-linux-gnu/libc++.a
[2520/2526] Building ASM object compiler-rt/lib/asan/CMakeFiles/RTAsan_dynamic.powerpc64le.dir/asan_interceptors_vfork.S.o
[2521/2526] Linking CXX shared library /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/clang/23/lib/powerpc64le-unknown-linux-gnu/libclang_rt.asan.so
[2522/2526] Building ASM object compiler-rt/lib/tsan/rtl/CMakeFiles/clang_rt.tsan-dynamic-powerpc64le.dir/tsan_rtl_ppc64.S.o
[2523/2526] Linking CXX shared library /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/clang/23/lib/powerpc64le-unknown-linux-gnu/libclang_rt.tsan.so
[2524/2526] Building ASM object compiler-rt/lib/orc/CMakeFiles/RTOrc.powerpc64le.dir/elfnix_tls.systemz.S.o
[2525/2526] Linking CXX static library compiler-rt/lib/orc/tests/libRTOrc.test.powerpc64le.a
[2526/2526] Linking CXX static library /home/buildbots/llvm-external-buildbots/workers/ppc64le-sanitizer/sanitizer-ppc64le/build/build_default/lib/clang/23/lib/powerpc64le-unknown-linux-gnu/liborc_rt.a
[4361/4363] No install step for 'runtimes'
[4363/4363] Completed 'runtimes'

command timed out: 1800 seconds without output running [b'python', b'../sanitizer_buildbot/sanitizers/zorg/buildbot/builders/sanitizers/buildbot_selector.py'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=6258.924168

```

</details>

https://github.com/llvm/llvm-project/pull/176566