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Add -m64 to gcc by default on illumos

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GCC on illumos generates 32-bit object files by default to maintain
backward compatibility, despite 32-bit platforms are no longer
supported. This may cause link errors, since most distros seem to supply
64-bit LLVM in their repositories (verified on OpenIndiana and OmniOS).
This commit adds an ILLUMOS_USE_M64 option, which is turned on by
default, to instruct gcc on illumos to generate 64-bit object files, as
this is usually the desired behaviour.
This commit is contained in:
Araragi Hokuto 2020-11-14 04:23:13 +08:00
parent 87ddcc443f
commit a10cdb7152
1 changed files with 17 additions and 0 deletions
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17
CMakeLists.txt
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@ -120,6 +120,23 @@ if(${CMAKE_SYSTEM_NAME} STREQUAL FreeBSD)
target_link_libraries(ccls PRIVATE thr)
endif()
if (${CMAKE_SYSTEM_NAME} STREQUAL SunOS)
# Check if we are on illumos
execute_process(COMMAND /usr/bin/uname -o OUTPUT_VARIABLE UNAME_O
OUTPUT_STRIP_TRAILING_WHITESPACE)
if ((UNAME_O STREQUAL illumos) AND (${CMAKE_CXX_COMPILER_ID} STREQUAL GNU))
# As a workaround for legacy packages, illumos' GCC generates 32-bit object files
# despite 32-bit platform support has already been dropped. This will probably cause a linker error
# since most distros seem to supply 64-bit LLVM in their repositories
# (verified on OpenIndiana and OmniOS).
# Add -m64 on illumos with GCC by default to generate 64-bit object files.
option(ILLUMOS_USE_M64 "Use -m64 on illumos to generate 64-bit object files" ON)
if (ILLUMOS_USE_M64)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m64")
endif()
endif()
endif()
if(LLVM_ENABLE_ZLIB)
find_package(ZLIB)
endif()