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CMake: Enable RELR relocations for Clang OR x86-64

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While LLD and mold support RELR "packed" relocations on all
architectures, the BFD linker currently only implements them on x86-64
and POWER.

This fixes two issues:
- The Kernel had it enabled even for AArch64 + GCC, which led to the
  following being printed: `warning: -z pack-relative-relocs ignored`.
- The userland always had it disabled, even in the supported AArch64 +
  Clang/mold scenarios.
This commit is contained in:
Daniel Bertalan 2023-08-11 12:55:45 +02:00
parent 11896868d6
commit 055d2b6c8a
Notes: sideshowbarker 2024-07-18 05:37:06 +09:00 
Author: https://github.com/BertalanD
Commit: https://github.com/SerenityOS/serenity/commit/055d2b6c8a
Pull-request: https://github.com/SerenityOS/serenity/pull/20492
Reviewed-by: https://github.com/kleinesfilmroellchen ✅
2 changed files with 9 additions and 7 deletions
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11
CMakeLists.txt
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@ -223,12 +223,11 @@ if (ENABLE_MOLD_LINKER)
add_link_options(-fuse-ld=mold)
endif()
if(NOT "${SERENITY_ARCH}" STREQUAL "aarch64")
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang$" OR ENABLE_MOLD_LINKER)
add_link_options(LINKER:--pack-dyn-relocs=relr)
else()
add_link_options(LINKER:-z,pack-relative-relocs)
endif()
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang$" OR ENABLE_MOLD_LINKER)
add_link_options(LINKER:--pack-dyn-relocs=relr)
elseif("${SERENITY_ARCH}" STREQUAL "x86_64")
# The BFD linker only supports RELR relocations on x86 and POWER.
add_link_options(LINKER:-z,pack-relative-relocs)
endif()
add_subdirectory(Userland)

5
Kernel/CMakeLists.txt
View file

@ -611,7 +611,10 @@ if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
set_source_files_properties(Library/MiniStdLib.cpp
PROPERTIES COMPILE_FLAGS "-fno-tree-loop-distribution -fno-tree-loop-distribute-patterns")
add_link_options(LINKER:-z,pack-relative-relocs)
if ("${SERENITY_ARCH}" STREQUAL "x86_64")
# The BFD linker only supports RELR relocations on x86 and POWER.
add_link_options(LINKER:-z,pack-relative-relocs)
endif()
else() # Assume Clang
add_compile_options(-Waddress-of-packed-member)
add_compile_options(-faligned-allocation)