diff options
Diffstat (limited to 'llvm/cmake/modules/HandleLLVMOptions.cmake')
| -rw-r--r-- | llvm/cmake/modules/HandleLLVMOptions.cmake | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake index 6119ecdce0f4..78be03d2bc13 100644 --- a/llvm/cmake/modules/HandleLLVMOptions.cmake +++ b/llvm/cmake/modules/HandleLLVMOptions.cmake @@ -582,6 +582,16 @@ if ( LLVM_COMPILER_IS_GCC_COMPATIBLE OR CMAKE_CXX_COMPILER_ID MATCHES "XL" ) add_flag_if_supported("-Werror=unguarded-availability-new" WERROR_UNGUARDED_AVAILABILITY_NEW) endif( LLVM_COMPILER_IS_GCC_COMPATIBLE OR CMAKE_CXX_COMPILER_ID MATCHES "XL" ) +if ( LLVM_COMPILER_IS_GCC_COMPATIBLE ) + # LLVM data structures like llvm::User and llvm::MDNode rely on + # the value of object storage persisting beyond the lifetime of the + # object (#24952). This is not standard compliant and causes a runtime + # crash if LLVM is built with GCC and LTO enabled (#57740). Until + # these bugs are fixed, we need to disable dead store eliminations + # based on object lifetime. + add_flag_if_supported("-fno-lifetime-dse" CMAKE_CXX_FLAGS) +endif ( LLVM_COMPILER_IS_GCC_COMPATIBLE ) + # Modules enablement for GCC-compatible compilers: if ( LLVM_COMPILER_IS_GCC_COMPATIBLE AND LLVM_ENABLE_MODULES ) set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) |