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CMake/Modules/Platform/Windows-Clang.cmake
Gregory Mitrano cea253a38b Clang: Fall back to llvm-rc when rc is unavailable 
This change modifies how CMAKE_RC_COMPILER is configured to improve
the out-of-box experience for developers using Clang on Windows.
The previous behavior was to require the user to explicitly specify
the resource compiler when CMake was called. The new behavior
is to automatically attempt to locate the MSVC rc binary and use that
if it's found. If rc is not available, CMake will now fall back to
Clang's llvm-rc binary.

With this change in place, trivial C/C++ programs can be generated
with Ninja and Clang on Windows without running into errors about
a missing resource compiler.

Fixes: #19318
2019-08-14 00:20:39 -04:00

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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
# This module is shared by multiple languages; use include blocker.
if(__WINDOWS_CLANG)
return()
endif()
set(__WINDOWS_CLANG 1)
macro(__windows_compiler_clang_gnu lang)
set(CMAKE_LIBRARY_PATH_FLAG "-L")
set(CMAKE_LINK_LIBRARY_FLAG "-l")
set(CMAKE_IMPORT_LIBRARY_PREFIX "")
set(CMAKE_SHARED_LIBRARY_PREFIX "")
set(CMAKE_SHARED_MODULE_PREFIX "")
set(CMAKE_STATIC_LIBRARY_PREFIX "")
set(CMAKE_EXECUTABLE_SUFFIX ".exe")
set(CMAKE_IMPORT_LIBRARY_SUFFIX ".lib")
set(CMAKE_SHARED_LIBRARY_SUFFIX ".dll")
set(CMAKE_SHARED_MODULE_SUFFIX ".dll")
set(CMAKE_STATIC_LIBRARY_SUFFIX ".lib")
set(CMAKE_DEPFILE_FLAGS_${lang} "-MD -MT <OBJECT> -MF <DEPFILE>")
set(CMAKE_FIND_LIBRARY_PREFIXES "lib" "")
set(CMAKE_FIND_LIBRARY_SUFFIXES ".dll" ".dll.a" ".a" ".lib")
set(CMAKE_SUPPORT_WINDOWS_EXPORT_ALL_SYMBOLS 1)
set (CMAKE_LINK_DEF_FILE_FLAG "-Xlinker /DEF:")
if("${CMAKE_${lang}_SIMULATE_VERSION}" MATCHES "^([0-9]+)\\.([0-9]+)")
math(EXPR MSVC_VERSION "${CMAKE_MATCH_1}*100 + ${CMAKE_MATCH_2}")
endif()
# No -fPIC on Windows
set(CMAKE_${lang}_COMPILE_OPTIONS_PIC "")
set(CMAKE_${lang}_COMPILE_OPTIONS_PIE "")
set(_CMAKE_${lang}_PIE_MAY_BE_SUPPORTED_BY_LINKER NO)
set(CMAKE_${lang}_LINK_OPTIONS_PIE "")
set(CMAKE_${lang}_LINK_OPTIONS_NO_PIE "")
set(CMAKE_SHARED_LIBRARY_${lang}_FLAGS "")
set(CMAKE_${lang}_USE_RESPONSE_FILE_FOR_OBJECTS 1)
set(CMAKE_${lang}_USE_RESPONSE_FILE_FOR_LIBRARIES 1)
set(CMAKE_${lang}_USE_RESPONSE_FILE_FOR_INCLUDES 1)
# Create archiving rules to support large object file lists for static libraries.
set(CMAKE_${lang}_ARCHIVE_CREATE "<CMAKE_AR> qc <TARGET> <LINK_FLAGS> <OBJECTS>")
set(CMAKE_${lang}_ARCHIVE_APPEND "<CMAKE_AR> q <TARGET> <LINK_FLAGS> <OBJECTS>")
set(CMAKE_${lang}_ARCHIVE_FINISH "<CMAKE_RANLIB> <TARGET>")
set(CMAKE_${lang}_CREATE_SHARED_LIBRARY
"<CMAKE_${lang}_COMPILER> -nostartfiles -nostdlib <CMAKE_SHARED_LIBRARY_${lang}_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS> -o <TARGET> ${CMAKE_GNULD_IMAGE_VERSION} -Xlinker /implib:<TARGET_IMPLIB> -Xlinker /pdb:<TARGET_PDB> -Xlinker /version:<TARGET_VERSION_MAJOR>.<TARGET_VERSION_MINOR> <OBJECTS> <LINK_LIBRARIES>")
set(CMAKE_${lang}_CREATE_SHARED_MODULE ${CMAKE_${lang}_CREATE_SHARED_LIBRARY})
set(CMAKE_${lang}_LINK_EXECUTABLE
"<CMAKE_${lang}_COMPILER> -nostartfiles -nostdlib <FLAGS> <CMAKE_${lang}_LINK_FLAGS> <LINK_FLAGS> <OBJECTS> -o <TARGET> -Xlinker /implib:<TARGET_IMPLIB> -Xlinker /pdb:<TARGET_PDB> -Xlinker /version:<TARGET_VERSION_MAJOR>.<TARGET_VERSION_MINOR> ${CMAKE_GNULD_IMAGE_VERSION} <LINK_LIBRARIES>")
set(CMAKE_${lang}_COMPILE_OPTIONS_MSVC_RUNTIME_LIBRARY_MultiThreaded -Xclang -flto-visibility-public-std -D_MT -Xclang --dependent-lib=libcmt)
set(CMAKE_${lang}_COMPILE_OPTIONS_MSVC_RUNTIME_LIBRARY_MultiThreadedDLL -D_DLL -D_MT -Xclang --dependent-lib=msvcrt)
set(CMAKE_${lang}_COMPILE_OPTIONS_MSVC_RUNTIME_LIBRARY_MultiThreadedDebug -D_DEBUG -Xclang -flto-visibility-public-std -D_MT -Xclang --dependent-lib=libcmtd)
set(CMAKE_${lang}_COMPILE_OPTIONS_MSVC_RUNTIME_LIBRARY_MultiThreadedDebugDLL -D_DEBUG -D_DLL -D_MT -Xclang --dependent-lib=msvcrtd)
if(CMAKE_MSVC_RUNTIME_LIBRARY_DEFAULT)
set(__ADDED_FLAGS "")
set(__ADDED_FLAGS_DEBUG "")
else()
set(__ADDED_FLAGS_DEBUG "-D_DEBUG -D_DLL -D_MT -Xclang --dependent-lib=msvcrtd")
set(__ADDED_FLAGS "-D_DLL -D_MT -Xclang --dependent-lib=msvcrt")
endif()
string(APPEND CMAKE_${lang}_FLAGS_DEBUG_INIT " -g -Xclang -gcodeview -O0 ${__ADDED_FLAGS_DEBUG}")
string(APPEND CMAKE_${lang}_FLAGS_MINSIZEREL_INIT " -Os -DNDEBUG ${__ADDED_FLAGS}")
string(APPEND CMAKE_${lang}_FLAGS_RELEASE_INIT " -O3 -DNDEBUG ${__ADDED_FLAGS}")
string(APPEND CMAKE_${lang}_FLAGS_RELWITHDEBINFO_INIT " -O2 -g -DNDEBUG -Xclang -gcodeview ${__ADDED_FLAGS}")
set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-isystem ")
unset(__ADDED_FLAGS)
unset(__ADDED_FLAGS_DEBUG)
string(TOLOWER "${CMAKE_BUILD_TYPE}" BUILD_TYPE_LOWER)
set(CMAKE_${lang}_STANDARD_LIBRARIES_INIT "-lkernel32 -luser32 -lgdi32 -lwinspool -lshell32 -lole32 -loleaut32 -luuid -lcomdlg32 -ladvapi32 -loldnames")
enable_language(RC)
endmacro()
if("x${CMAKE_C_SIMULATE_ID}" STREQUAL "xMSVC"
OR "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC")
if ( DEFINED CMAKE_C_COMPILER_ID AND DEFINED CMAKE_CXX_COMPILER_ID
AND NOT "x${CMAKE_C_COMPILER_ID}" STREQUAL "x${CMAKE_CXX_COMPILER_ID}")
message(FATAL_ERROR "The current configuration mixes Clang and MSVC or "
"some other CL compatible compiler tool. This is not supported. "
"Use either clang or MSVC as both C and C++ compilers.")
endif()
if ( DEFINED CMAKE_C_COMPILER_FRONTEND_VARIANT AND DEFINED CMAKE_CXX_COMPILER_FRONTEND_VARIANT
AND NOT "x${CMAKE_C_COMPILER_FRONTEND_VARIANT}" STREQUAL "x${CMAKE_CXX_COMPILER_FRONTEND_VARIANT}")
message(FATAL_ERROR "The current configuration uses the Clang compiler "
"tool with mixed frontend variants, both the GNU and in MSVC CL "
"like variants. This is not supported. Use either clang/clang++ "
"or clang-cl as both C and C++ compilers.")
endif()
if(NOT CMAKE_RC_COMPILER_INIT)
# Check if rc is already in the path
# This may happen in cases where the user is already in a visual studio environment when CMake is invoked
find_program(__RC_COMPILER_PATH NAMES rc)
# Default to rc if it's available, otherwise fall back to llvm-rc
if(__RC_COMPILER_PATH)
set(CMAKE_RC_COMPILER_INIT rc)
else()
set(CMAKE_RC_COMPILER_INIT llvm-rc)
endif()
unset(__RC_COMPILER_PATH CACHE)
endif()
if ( "x${CMAKE_CXX_COMPILER_FRONTEND_VARIANT}" STREQUAL "xMSVC" OR "x${CMAKE_C_COMPILER_FRONTEND_VARIANT}" STREQUAL "xMSVC" )
include(Platform/Windows-MSVC)
macro(__windows_compiler_clang lang)
set(_COMPILE_${lang} "${_COMPILE_${lang}_MSVC}")
__windows_compiler_msvc(${lang})
endmacro()
else()
cmake_policy(GET CMP0091 __WINDOWS_CLANG_CMP0091)
if(__WINDOWS_CLANG_CMP0091 STREQUAL "NEW")
set(CMAKE_MSVC_RUNTIME_LIBRARY_DEFAULT "MultiThreaded$<$<CONFIG:Debug>:Debug>DLL")
else()
set(CMAKE_MSVC_RUNTIME_LIBRARY_DEFAULT "")
endif()
unset(__WINDOWS_CLANG_CMP0091)
set(CMAKE_BUILD_TYPE_INIT Debug)
macro(__windows_compiler_clang lang)
__windows_compiler_clang_gnu(${lang})
endmacro()
endif()
else()
include(Platform/Windows-GNU)
macro(__windows_compiler_clang lang)
__windows_compiler_gnu(${lang})
endmacro()
endif()
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