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CMake: Enable using clang-cl on windows 

detect clang with MSVC frontend using CMAKE_CXX_COMPILER_FRONTEND_VARIANT
pull/1651/head
Samuel Nicholas 2024-12-05 09:35:32 +10:30
parent ce66e6bb39
commit ef9778a392
2 changed files with 26 additions and 4 deletions
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1
CMakeLists.txt
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@ -50,6 +50,7 @@ project( godot-cpp
HOMEPAGE_URL "https://github.com/godotengine/godot-cpp"
LANGUAGES CXX)
compiler_detection()
godotcpp_generate()
# Test Example

29
cmake/common_compiler_flags.cmake
View File

@ -2,9 +2,10 @@
Common Compiler Flags
---------------------
This file contains a single function to configure platform agnostic compiler
flags like optimization levels, warnings, and features. For platform specific
flags look to each of the ``cmake/<platform>.cmake`` files.
This file contains host platform toolchain and target platform agnostic
configuration. It includes flags like optimization levels, warnings, and
features. For target platform specific flags look to each of the
``cmake/<platform>.cmake`` files.
]=======================================================================]
@ -24,6 +25,25 @@ set( GNU_GT_V11 "$<VERSION_GREATER_EQUAL:$<CXX_COMPILER_VERSION>,11>" )
set( GNU_LT_V11 "$<VERSION_LESS:$<CXX_COMPILER_VERSION>,11>" )
set( GNU_GE_V12 "$<VERSION_GREATER_EQUAL:$<CXX_COMPILER_VERSION>,12>" )
#[[ Check for clang-cl with MSVC frontend
The compiler is tested and set when the project command is called.
The variable CXX_COMPILER_FRONTEND_VARIANT was introduced in 3.14
The generator expression $<CXX_COMPILER_FRONTEND_VARIANT> wasn't introduced
until CMake 3.30 so we can't use it yet.
So to support clang downloaded from llvm.org which uses the MSVC frontend
by default, we need to test for it. ]]
function( compiler_detection )
if( ${CMAKE_CXX_COMPILER_ID} STREQUAL Clang )
if( ${CMAKE_CXX_COMPILER_FRONTEND_VARIANT} STREQUAL MSVC )
message( "Using clang-cl" )
set( IS_CLANG "0" PARENT_SCOPE )
set( IS_MSVC "1" PARENT_SCOPE )
set( NOT_MSVC "0" PARENT_SCOPE )
endif ()
endif ()
endfunction( )
function( common_compiler_flags TARGET_NAME )
target_compile_features(${TARGET_NAME}
@ -60,7 +80,8 @@ function( common_compiler_flags TARGET_NAME )
# MSVC only
$<${IS_MSVC}:
"/MP ${PROC_N}"
# /MP isn't valid for clang-cl with msvc frontend
$<$<CXX_COMPILER_ID:MSVC>:/MP${PROC_N}>
/W4
# Disable warnings which we don't plan to fix.