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| author | Csanád Hajdú <csanad.hajdu@arm.com> | 2025-11-07 09:36:00 +0100 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2025-11-07 09:36:00 +0100 |
| commit | 927092b262e58a7f3d79fea615daecc60e61bdcb (patch) | |
| tree | c32ad30d9ed6221120fc06bd464c88f94c2d35fe | |
| parent | bac427a0f634bb2f34022efe3f20e7a3a8f1d369 (diff) | |
| download | llvm-927092b262e58a7f3d79fea615daecc60e61bdcb.zip llvm-927092b262e58a7f3d79fea615daecc60e61bdcb.tar.gz llvm-927092b262e58a7f3d79fea615daecc60e61bdcb.tar.bz2 | |
[Runtimes][CMake] Add CMake option to enable execute-only code generation on AArch64 (#143698)
Based on the discussion in
https://discourse.llvm.org/t/rfc-execute-only-code-support-for-runtime-libraries-on-aarch64/86180
a single, global configuration option should be used to enable
execute-only code generation for the runtime libraries. The new option
`RUNTIMES_EXECUTE_ONLY_CODE` adds the `-mexecute-only` flag to
`CMAKE_C_FLAGS` and `CMAKE_CXX_FLAGS`, which simplifies the
library-level configuration needed for the runtime libraries.
Project-specific changes are still needed to handle assembly sources,
e.g. in compiler-rt and libunwind.
| -rw-r--r-- | runtimes/CMakeLists.txt | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/runtimes/CMakeLists.txt b/runtimes/CMakeLists.txt index d3280a5..cc756da 100644 --- a/runtimes/CMakeLists.txt +++ b/runtimes/CMakeLists.txt @@ -233,6 +233,20 @@ endif() option(LLVM_INCLUDE_TESTS "Generate build targets for the runtimes unit tests." ON) option(LLVM_INCLUDE_DOCS "Generate build targets for the runtimes documentation." ON) option(LLVM_ENABLE_SPHINX "Use Sphinx to generate the runtimes documentation." OFF) +option(RUNTIMES_EXECUTE_ONLY_CODE "Compile runtime libraries as execute-only." OFF) + +if (RUNTIMES_EXECUTE_ONLY_CODE) + # If a target doesn't support or recognise -mexecute-only, Clang will simply ignore the flag. + # We can check for this case using -Werror=unused-command-line-argument. + check_c_compiler_flag("-mexecute-only -Werror=unused-command-line-argument" C_SUPPORTS_MEXECUTE_ONLY) + if (NOT C_SUPPORTS_MEXECUTE_ONLY) + message(FATAL_ERROR "RUNTIMES_EXECUTE_ONLY_CODE was turned on, but the target '${LLVM_TARGET_TRIPLE}'" + " doesn't support the -mexecute-only flag") + endif() + + set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mexecute-only") + set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mexecute-only") +endif() # Use libtool instead of ar if you are both on an Apple host, and targeting Apple. if(CMAKE_HOST_APPLE AND APPLE) |