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[flang] [runtime] Explicitly disable EH & RTTI (#126920)

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Explicitly disable EH & RTTI when building Flang runtime library. This
fixes the runtime built when Flang is built standalone against system
LLVM that was compiled with EH & RTTI enabled.

I think this change may be sufficient to lift the top-level
`LLVM_ENABLE_EH` restriction from Flang. However, I'd prefer if somebody
more knowledgeable decided on that.
This commit is contained in:
Michał Górny 2025-02-12 19:03:04 +01:00 committed by GitHub
parent a684e0ea57
commit c665480694
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1 changed files with 10 additions and 0 deletions
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10
flang/runtime/CMakeLists.txt
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@ -99,6 +99,15 @@ else()
set(NO_LTO_FLAGS "")
endif()
# based on AddLLVM.cmake
if (LLVM_COMPILER_IS_GCC_COMPATIBLE)
set(NO_RTTI_FLAGS "-fno-exceptions -fno-rtti")
elseif (MSVC)
set(NO_RTTI_FLAGS "/EHs-c- /GR-")
elseif (CMAKE_CXX_COMPILER_ID MATCHES "XL")
set(NO_RTTI_FLAGS "-qnoeh -qnortti")
endif ()
configure_file(config.h.cmake config.h)
# include_directories is used here instead of target_include_directories
# because add_flang_library creates multiple objects (STATIC/SHARED, OBJECT)
@ -107,6 +116,7 @@ include_directories(AFTER ${CMAKE_CURRENT_BINARY_DIR})
append(${NO_LTO_FLAGS} CMAKE_C_FLAGS)
append(${NO_LTO_FLAGS} CMAKE_CXX_FLAGS)
append(${NO_RTTI_FLAGS} CMAKE_CXX_FLAGS)
# Disable libstdc++/libc++ assertions, even in an LLVM_ENABLE_ASSERTIONS build,
# to avoid an unwanted dependency on libstdc++/libc++.so.