[llvm] [Analysis] Ensure use of strict fp exceptions in ConstantFolding (PR #136139)

Mon May 5 17:57:33 PDT 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `flang-runtime-cuda-gcc` running on `as-builder-7` while building `llvm` at step 6 "build-flang-rt".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/152/builds/2389

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

```
Step 6 (build-flang-rt) failure: cmake (failure)
...
11.914 [3962/64/2668] Building CXX object lib/MC/CMakeFiles/LLVMMC.dir/MCObjectWriter.cpp.o
11.915 [3961/64/2669] Building CXX object lib/MC/CMakeFiles/LLVMMC.dir/MCSectionCOFF.cpp.o
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11.918 [3958/64/2672] Building CXX object lib/MC/CMakeFiles/LLVMMC.dir/MCSchedule.cpp.o
11.919 [3957/64/2673] Building CXX object lib/MC/CMakeFiles/LLVMMC.dir/MCSection.cpp.o
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11.923 [3953/64/2677] Building CXX object lib/Analysis/CMakeFiles/LLVMAnalysis.dir/ConstantFolding.cpp.o
FAILED: lib/Analysis/CMakeFiles/LLVMAnalysis.dir/ConstantFolding.cpp.o 
ccache /usr/bin/g++ -DGTEST_HAS_RTTI=0 -DHAS_LOGF128 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/buildbot/worker/as-builder-7/ramdisk/flang-runtime-cuda-gcc/build/lib/Analysis -I/home/buildbot/worker/as-builder-7/ramdisk/flang-runtime-cuda-gcc/llvm-project/llvm/lib/Analysis -I/home/buildbot/worker/as-builder-7/ramdisk/flang-runtime-cuda-gcc/build/include -I/home/buildbot/worker/as-builder-7/ramdisk/flang-runtime-cuda-gcc/llvm-project/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-maybe-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -std=c++17  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -ffp-exception-behavior=strict -MD -MT lib/Analysis/CMakeFiles/LLVMAnalysis.dir/ConstantFolding.cpp.o -MF lib/Analysis/CMakeFiles/LLVMAnalysis.dir/ConstantFolding.cpp.o.d -o lib/Analysis/CMakeFiles/LLVMAnalysis.dir/ConstantFolding.cpp.o -c /home/buildbot/worker/as-builder-7/ramdisk/flang-runtime-cuda-gcc/llvm-project/llvm/lib/Analysis/ConstantFolding.cpp
g++: error: unrecognized command-line option ‘-ffp-exception-behavior=strict’
11.923 [3953/63/2678] Building CXX object lib/MC/CMakeFiles/LLVMMC.dir/MCSectionWasm.cpp.o
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11.926 [3953/56/2685] Building CXX object lib/MC/CMakeFiles/LLVMMC.dir/MCSymbolXCOFF.cpp.o
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11.927 [3953/54/2687] Building CXX object lib/MC/CMakeFiles/LLVMMC.dir/MCValue.cpp.o
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11.930 [3953/47/2694] Building CXX object lib/MC/CMakeFiles/LLVMMC.dir/MCWinCOFFStreamer.cpp.o
11.932 [3953/46/2695] Building CXX object lib/MC/CMakeFiles/LLVMMC.dir/MCXCOFFStreamer.cpp.o
11.934 [3953/45/2696] Building CXX object lib/MC/CMakeFiles/LLVMMC.dir/WasmObjectWriter.cpp.o
11.934 [3953/44/2697] Building CXX object lib/MC/CMakeFiles/LLVMMC.dir/SPIRVObjectWriter.cpp.o
11.934 [3953/43/2698] Building CXX object lib/MC/CMakeFiles/LLVMMC.dir/StringTableBuilder.cpp.o
11.935 [3953/42/2699] Building CXX object lib/MC/CMakeFiles/LLVMMC.dir/MachObjectWriter.cpp.o
11.937 [3953/41/2700] Building CXX object lib/MC/CMakeFiles/LLVMMC.dir/TargetRegistry.cpp.o
11.937 [3953/40/2701] Building PPCGenGlobalISel.inc...
11.998 [3953/39/2702] Building RISCVGenAsmWriter.inc...
12.078 [3953/38/2703] Building RISCVGenO0PreLegalizeGICombiner.inc...
12.125 [3953/37/2704] Building RISCVGenMCPseudoLowering.inc...
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12.406 [3953/34/2707] Building RISCVGenRegisterBank.inc...
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12.437 [3953/32/2709] Building VEGenAsmWriter.inc...
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12.740 [3953/30/2711] Building RISCVGenMCCodeEmitter.inc...
12.934 [3953/29/2712] Building RISCVGenRegisterInfo.inc...
12.952 [3953/28/2713] Building RISCVGenPreLegalizeGICombiner.inc...

```

</details>

https://github.com/llvm/llvm-project/pull/136139