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[CMake] Add `--gdb-index` option to linker if split dwarf compiling 

The option `--gdb-index` should be passed to linker if compiler is invoked
with `-gsplit-dwarf` option. This allows debugger to locate the appropriate
units quickly. See "Invocation" section here: https://gcc.gnu.org/wiki/DebugFission

Suggested by @dblaikie here: https://reviews.llvm.org/D68556#1698442

Differential Revision: https://reviews.llvm.org/D108776
This commit is contained in:
Anton Afanasyev 2021-08-26 01:25:27 +03:00
parent 9db95a67d1
commit b1b68b4c01
1 changed files with 4 additions and 0 deletions
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4
llvm/cmake/modules/HandleLLVMOptions.cmake
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@ -901,6 +901,10 @@ if (LLVM_USE_SPLIT_DWARF AND
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR
CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
add_compile_options(-gsplit-dwarf)
include(LLVMCheckLinkerFlag)
llvm_check_linker_flag(CXX "-Wl,--gdb-index" LINKER_SUPPORTS_GDB_INDEX)
append_if(LINKER_SUPPORTS_GDB_INDEX "-Wl,--gdb-index"
CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
endif()
endif()