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CMake: Detect all variations of the clang compiler (hopefully)

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According to
https://cmake.org/cmake/help/v3.26/variable/CMAKE_LANG_COMPILER_ID.html
there's at least "Clang" (plain LLVM clang), "AppleClang", "ARMClang",
"FujitsuClang", "XLClang" and "IBMClang" (both of which are variations
of the clang/llvm-based IBM XL compiler).

This should detect all of them (I hope they all behave close enough
to normal clang to work..)

There's also "IntelLLVM", but I have no idea if that's based on Clang
or does its own thing based on LLVM.. I also doubt dhewm3 will ever
be built with any other clang-derivate than "Clang" and "AppleClang" :-p

fixes #510
This commit is contained in:
Daniel Gibson 2023-05-19 03:33:46 +02:00
parent 03fccc6220
commit b6365e91d7
1 changed files with 18 additions and 3 deletions
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21
neo/CMakeLists.txt
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@ -230,6 +230,9 @@ else()
set(CURL_LIBRARY "")
endif()
set(D3_COMPILER_IS_CLANG FALSE)
set(D3_COMPILER_IS_GCC_OR_CLANG FALSE)
if(MSVC)
# This is required for tools on windows.
find_package(MFC)
@ -258,10 +261,22 @@ if(NOT WIN32)
endif()
endif() # NOT WIN32
# check if this is some kind of clang (Clang, AppleClang, whatever)
# (convert compiler ID to lowercase so we match Clang, clang, AppleClang etc, regardless of case)
string(TOLOWER ${CMAKE_CXX_COMPILER_ID} compiler_id_lower)
if(compiler_id_lower MATCHES ".*clang.*")
message(STATUS "Compiler \"${CMAKE_CXX_COMPILER_ID}\" detected as some kind of clang")
set(D3_COMPILER_IS_CLANG TRUE)
set(D3_COMPILER_IS_GCC_OR_CLANG TRUE)
elseif(CMAKE_COMPILER_IS_GNUCC)
set(D3_COMPILER_IS_GCC_OR_CLANG TRUE)
endif()
unset(compiler_id_lower)
endif() # not MSVC
# compiler specific flags
if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_C_COMPILER_ID STREQUAL "Clang")
if(D3_COMPILER_IS_GCC_OR_CLANG)
add_compile_options(-pipe)
add_compile_options(-Wall)
@ -274,7 +289,7 @@ if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_C_COMPILER_ID STREQUAL "Clang")
if(FORCE_COLORED_OUTPUT)
if(CMAKE_COMPILER_IS_GNUCC)
add_compile_options (-fdiagnostics-color=always)
elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
elseif (D3_COMPILER_IS_CLANG)
add_compile_options (-fcolor-diagnostics)
endif ()
endif ()
@ -1096,7 +1111,7 @@ if (AROS)
set(AROS_ARCH ${CMAKE_SYSTEM_PROCESSOR})
endif()
else()
if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_C_COMPILER_ID STREQUAL "Clang" AND NOT MINGW)
if(D3_COMPILER_IS_GCC_OR_CLANG AND NOT MINGW)
set_target_properties(idlib PROPERTIES COMPILE_FLAGS "-fPIC")
endif()
endif()