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clang: introduce CMAKE_<lang>_COMPILER_FRONTEND_VARIANT

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This variable is set to GNU on Windows when clang.exe ar clang++.exe is
used, and set to MSVC for clang-cl.exe.

CMAKE_<lang>_SIMULATE_ID is set to MSVC in both cases, as clang defaults
to -fms-compatibility for all command lines on windows.
This commit is contained in:
Zsolt Parragi
2019-02-20 12:13:55 +01:00
parent 66efdbd21a
commit 53fbe23f3f
5 changed files with 30 additions and 38 deletions
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1
Modules/CMakeCCompiler.cmake.in
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@@ -12,6 +12,7 @@ set(CMAKE_C11_COMPILE_FEATURES "@CMAKE_C11_COMPILE_FEATURES@")
set(CMAKE_C_PLATFORM_ID "@CMAKE_C_PLATFORM_ID@")
set(CMAKE_C_SIMULATE_ID "@CMAKE_C_SIMULATE_ID@")
set(CMAKE_C_COMPILER_FRONTEND_VARIANT "@CMAKE_C_COMPILER_FRONTEND_VARIANT@")
set(CMAKE_C_SIMULATE_VERSION "@CMAKE_C_SIMULATE_VERSION@")
@_SET_CMAKE_C_COMPILER_ARCHITECTURE_ID@
@SET_MSVC_C_ARCHITECTURE_ID@

1
Modules/CMakeCXXCompiler.cmake.in
View File

@@ -14,6 +14,7 @@ set(CMAKE_CXX20_COMPILE_FEATURES "@CMAKE_CXX20_COMPILE_FEATURES@")
set(CMAKE_CXX_PLATFORM_ID "@CMAKE_CXX_PLATFORM_ID@")
set(CMAKE_CXX_SIMULATE_ID "@CMAKE_CXX_SIMULATE_ID@")
set(CMAKE_CXX_COMPILER_FRONTEND_VARIANT "@CMAKE_CXX_COMPILER_FRONTEND_VARIANT@")
set(CMAKE_CXX_SIMULATE_VERSION "@CMAKE_CXX_SIMULATE_VERSION@")
@_SET_CMAKE_CXX_COMPILER_ARCHITECTURE_ID@
@SET_MSVC_CXX_ARCHITECTURE_ID@

1
Modules/CMakeDetermineCCompiler.cmake
View File

@@ -111,7 +111,6 @@ if(NOT CMAKE_C_COMPILER_ID_RUN)
include(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerId.cmake)
CMAKE_DETERMINE_COMPILER_ID(C CFLAGS CMakeCCompilerId.c)
CMAKE_DIAGNOSE_UNSUPPORTED_CLANG(C CC)
# Set old compiler and platform id variables.
if(CMAKE_C_COMPILER_ID STREQUAL "GNU")

1
Modules/CMakeDetermineCXXCompiler.cmake
View File

@@ -106,7 +106,6 @@ if(NOT CMAKE_CXX_COMPILER_ID_RUN)
include(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerId.cmake)
CMAKE_DETERMINE_COMPILER_ID(CXX CXXFLAGS CMakeCXXCompilerId.cpp)
CMAKE_DIAGNOSE_UNSUPPORTED_CLANG(CXX CXX)
# Set old compiler and platform id variables.
if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")

64
Modules/CMakeDetermineCompilerId.cmake
View File

@@ -103,6 +103,31 @@ function(CMAKE_DETERMINE_COMPILER_ID lang flagvar src)
set(CMAKE_${lang}_CL_SHOWINCLUDES_PREFIX "")
endif()
set(_variant "")
if("x${CMAKE_${lang}_COMPILER_ID}" STREQUAL "xClang")
if(CMAKE_HOST_WIN32 AND "x${CMAKE_${lang}_SIMULATE_ID}" STREQUAL "xMSVC")
if(CMAKE_GENERATOR MATCHES "Visual Studio")
set(CMAKE_${lang}_COMPILER_FRONTEND_VARIANT "MSVC")
else()
# Test whether an MSVC-like command-line option works.
execute_process(COMMAND "${CMAKE_${lang}_COMPILER}" -?
RESULT_VARIABLE _clang_result
OUTPUT_VARIABLE _clang_stdout
ERROR_VARIABLE _clang_stderr)
if(_clang_result EQUAL 0)
set(CMAKE_${lang}_COMPILER_FRONTEND_VARIANT "MSVC")
else()
set(CMAKE_${lang}_COMPILER_FRONTEND_VARIANT "GNU")
endif()
endif()
set(_variant " with ${CMAKE_${lang}_COMPILER_FRONTEND_VARIANT}-like command-line")
else()
set(CMAKE_${lang}_COMPILER_FRONTEND_VARIANT "GNU")
endif()
else()
set(CMAKE_${lang}_COMPILER_FRONTEND_VARIANT "")
endif()
# Display the final identification result.
if(CMAKE_${lang}_COMPILER_ID)
if(CMAKE_${lang}_COMPILER_VERSION)
@@ -116,9 +141,10 @@ function(CMAKE_DETERMINE_COMPILER_ID lang flagvar src)
set(_archid "")
endif()
message(STATUS "The ${lang} compiler identification is "
"${CMAKE_${lang}_COMPILER_ID}${_archid}${_version}")
"${CMAKE_${lang}_COMPILER_ID}${_archid}${_version}${_variant}")
unset(_archid)
unset(_version)
unset(_variant)
else()
message(STATUS "The ${lang} compiler identification is unknown")
endif()
@@ -137,6 +163,7 @@ function(CMAKE_DETERMINE_COMPILER_ID lang flagvar src)
PARENT_SCOPE)
set(CMAKE_${lang}_XCODE_ARCHS "${CMAKE_${lang}_XCODE_ARCHS}" PARENT_SCOPE)
set(CMAKE_${lang}_CL_SHOWINCLUDES_PREFIX "${CMAKE_${lang}_CL_SHOWINCLUDES_PREFIX}" PARENT_SCOPE)
set(CMAKE_${lang}_COMPILER_FRONTEND_VARIANT "${CMAKE_${lang}_COMPILER_FRONTEND_VARIANT}" PARENT_SCOPE)
set(CMAKE_${lang}_COMPILER_VERSION "${CMAKE_${lang}_COMPILER_VERSION}" PARENT_SCOPE)
set(CMAKE_${lang}_COMPILER_VERSION_INTERNAL "${CMAKE_${lang}_COMPILER_VERSION_INTERNAL}" PARENT_SCOPE)
set(CMAKE_${lang}_COMPILER_WRAPPER "${CMAKE_${lang}_COMPILER_WRAPPER}" PARENT_SCOPE)
@@ -838,38 +865,3 @@ function(CMAKE_DETERMINE_MSVC_SHOWINCLUDES_PREFIX lang userflags)
set(CMAKE_${lang}_CL_SHOWINCLUDES_PREFIX "" PARENT_SCOPE)
endif()
endfunction()
function(CMAKE_DIAGNOSE_UNSUPPORTED_CLANG lang envvar)
if(NOT CMAKE_HOST_WIN32 OR CMAKE_GENERATOR MATCHES "Visual Studio" OR
NOT "${CMAKE_${lang}_COMPILER_ID};${CMAKE_${lang}_SIMULATE_ID}" STREQUAL "Clang;MSVC")
return()
endif()
# Test whether an MSVC-like command-line option works.
execute_process(COMMAND "${CMAKE_${lang}_COMPILER}" -?
RESULT_VARIABLE _clang_result
OUTPUT_VARIABLE _clang_stdout
ERROR_VARIABLE _clang_stderr)
if(_clang_result EQUAL 0)
return()
endif()
# Help the user configure the environment to use the MSVC-like Clang.
string(CONCAT _msg
"The Clang compiler tool\n"
" \"${CMAKE_${lang}_COMPILER}\"\n"
"targets the MSVC ABI but has a GNU-like command-line interface. "
"This is not supported. "
"Use 'clang-cl' instead, e.g. by setting '${envvar}=clang-cl' in the environment."
)
execute_process(COMMAND rc -help
RESULT_VARIABLE _rc_result
OUTPUT_VARIABLE _rc_stdout
ERROR_VARIABLE _rc_stderr)
if(NOT _rc_result EQUAL 0)
string(APPEND _msg " "
"Furthermore, use the MSVC command-line environment."
)
endif()
message(FATAL_ERROR "${_msg}")
endfunction()