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CMake/Tests/Module/WriteCompilerDetectionHeader/CMakeLists.txt

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Features: Quote all compiler names when comparing with COMPILER_ID In preparation of adding MSVC support we need to quote all compiler names, as MSVC is also a CMake variable.
2015-01-06 21:31:30 +03:00
cmake_minimum_required(VERSION 3.1.0)
Add the WriteCompilerDetectionHeader module. Provide a function to write a portable header to detect compiler features. Generate a preprocessor #error for unknown compilers and compiler versions whose features are not yet recorded. This error condition might be relaxed in the future, but for now it is useful for verification of expectations.
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project(WriteCompilerDetectionHeader)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
include(WriteCompilerDetectionHeader)
get_property(cxx_known_features GLOBAL PROPERTY CMAKE_CXX_KNOWN_FEATURES)
Features: Extend concept to C language. Add properties and variables corresponding to CXX equivalents. Add features for c_function_prototypes (C90), c_restrict (C99), c_variadic_macros (C99) and c_static_assert (C11). This feature set can be extended later. Add a <PREFIX>_RESTRICT symbol define to WriteCompilerDetectionHeader to conditionally represent the c_restrict feature.
2013-11-04 04:15:43 +04:00
get_property(c_known_features GLOBAL PROPERTY CMAKE_C_KNOWN_FEATURES)
Add the WriteCompilerDetectionHeader module. Provide a function to write a portable header to detect compiler features. Generate a preprocessor #error for unknown compilers and compiler versions whose features are not yet recorded. This error condition might be relaxed in the future, but for now it is useful for verification of expectations.
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write_compiler_detection_header(
FILE "${CMAKE_CURRENT_BINARY_DIR}/test_compiler_detection.h"
PREFIX TEST
Features: Enable writing of MSVC compiler feature header. Notes: VS2015 and above are the only MSVC versions to support cxx_final, so remove usages from the tests, and instead only test for cxx_override. VS2012 and above to conform to cxx_decltype_incomplete_return_types proposal, but without support for auto return types the dcl.type.simple example in the proposal doesn't compile. VS2013 and above to conform to the updated cxx_contextual_conversions proposal, but VS2010 and above pass the test. Compilers such as MSVC have no explicit flags to enable C++11 mode, it just is always on. So only run the link tests with compilers that require a flag to specify the language version.
2015-01-06 21:19:44 +03:00
COMPILERS GNU Clang AppleClang MSVC
Add the WriteCompilerDetectionHeader module. Provide a function to write a portable header to detect compiler features. Generate a preprocessor #error for unknown compilers and compiler versions whose features are not yet recorded. This error condition might be relaxed in the future, but for now it is useful for verification of expectations.
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VERSION 3.1
PROLOG "// something"
EPILOG "// more"
FEATURES
Features: Extend concept to C language. Add properties and variables corresponding to CXX equivalents. Add features for c_function_prototypes (C90), c_restrict (C99), c_variadic_macros (C99) and c_static_assert (C11). This feature set can be extended later. Add a <PREFIX>_RESTRICT symbol define to WriteCompilerDetectionHeader to conditionally represent the c_restrict feature.
2013-11-04 04:15:43 +04:00
${cxx_known_features} ${c_known_features}
Add the WriteCompilerDetectionHeader module. Provide a function to write a portable header to detect compiler features. Generate a preprocessor #error for unknown compilers and compiler versions whose features are not yet recorded. This error condition might be relaxed in the future, but for now it is useful for verification of expectations.
2013-10-21 18:59:40 +04:00
)
Features: Extend concept to C language. Add properties and variables corresponding to CXX equivalents. Add features for c_function_prototypes (C90), c_restrict (C99), c_variadic_macros (C99) and c_static_assert (C11). This feature set can be extended later. Add a <PREFIX>_RESTRICT symbol define to WriteCompilerDetectionHeader to conditionally represent the c_restrict feature.
2013-11-04 04:15:43 +04:00
if (NOT CMAKE_CXX_COMPILE_FEATURES AND NOT CMAKE_C_COMPILE_FEATURES)
Add the WriteCompilerDetectionHeader module. Provide a function to write a portable header to detect compiler features. Generate a preprocessor #error for unknown compilers and compiler versions whose features are not yet recorded. This error condition might be relaxed in the future, but for now it is useful for verification of expectations.
2013-10-21 18:59:40 +04:00
file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/dummy.cpp"
"int main(int,char**) { return 0; }\n"
)
add_executable(WriteCompilerDetectionHeader "${CMAKE_CURRENT_BINARY_DIR}/dummy.cpp")
include(CheckCXXSourceCompiles)
check_cxx_source_compiles("#include \"${CMAKE_CURRENT_BINARY_DIR}/test_compiler_detection.h\"\nint main() { return 0; }\n"
file_include_works
)
if (file_include_works)
message(SEND_ERROR "Inclusion of ${CMAKE_CURRENT_BINARY_DIR}/test_compiler_detection.h was expected to cause an error, but did not.")
endif()
return()
endif()
Features: Add compiler version support to WriteCompilerDetectionHeader.
2014-06-05 15:16:56 +04:00
string(REGEX REPLACE "^([0-9]+)\\.[0-9]+\\.[0-9]+.*" "\\1" COMPILER_VERSION_MAJOR "${CMAKE_CXX_COMPILER_VERSION}")
string(REGEX REPLACE "^[0-9]+\\.([0-9]+)\\.[0-9]+.*" "\\1" COMPILER_VERSION_MINOR "${CMAKE_CXX_COMPILER_VERSION}")
string(REGEX REPLACE "^[0-9]+\\.[0-9]+\\.([0-9]+).*" "\\1" COMPILER_VERSION_PATCH "${CMAKE_CXX_COMPILER_VERSION}")
Add the WriteCompilerDetectionHeader module. Provide a function to write a portable header to detect compiler features. Generate a preprocessor #error for unknown compilers and compiler versions whose features are not yet recorded. This error condition might be relaxed in the future, but for now it is useful for verification of expectations.
2013-10-21 18:59:40 +04:00
macro(set_defines target true_defs false_defs)
set(defines)
foreach(def ${true_defs})
list(APPEND defines ${def}=1)
endforeach()
foreach(def ${false_defs})
list(APPEND defines ${def}=0)
endforeach()
target_compile_definitions(${target}
PRIVATE
${defines}
Features: Add compiler version support to WriteCompilerDetectionHeader.
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EXPECTED_COMPILER_VERSION_MAJOR=${COMPILER_VERSION_MAJOR}
EXPECTED_COMPILER_VERSION_MINOR=${COMPILER_VERSION_MINOR}
EXPECTED_COMPILER_VERSION_PATCH=${COMPILER_VERSION_PATCH}
Add the WriteCompilerDetectionHeader module. Provide a function to write a portable header to detect compiler features. Generate a preprocessor #error for unknown compilers and compiler versions whose features are not yet recorded. This error condition might be relaxed in the future, but for now it is useful for verification of expectations.
2013-10-21 18:59:40 +04:00
)
endmacro()
Features: Quote all compiler names when comparing with COMPILER_ID In preparation of adding MSVC support we need to quote all compiler names, as MSVC is also a CMake variable.
2015-01-06 21:31:30 +03:00
if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU"
OR CMAKE_CXX_COMPILER_ID STREQUAL "Clang"
OR CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
Add the WriteCompilerDetectionHeader module. Provide a function to write a portable header to detect compiler features. Generate a preprocessor #error for unknown compilers and compiler versions whose features are not yet recorded. This error condition might be relaxed in the future, but for now it is useful for verification of expectations.
2013-10-21 18:59:40 +04:00
# False for C++98 mode.
list(APPEND false_defs EXPECTED_COMPILER_CXX_DELEGATING_CONSTRUCTORS)
list(APPEND false_defs EXPECTED_COMPILER_CXX_VARIADIC_TEMPLATES)
endif()
Features: Enable writing of MSVC compiler feature header. Notes: VS2015 and above are the only MSVC versions to support cxx_final, so remove usages from the tests, and instead only test for cxx_override. VS2012 and above to conform to cxx_decltype_incomplete_return_types proposal, but without support for auto return types the dcl.type.simple example in the proposal doesn't compile. VS2013 and above to conform to the updated cxx_contextual_conversions proposal, but VS2010 and above pass the test. Compilers such as MSVC have no explicit flags to enable C++11 mode, it just is always on. So only run the link tests with compilers that require a flag to specify the language version.
2015-01-06 21:19:44 +03:00
# for msvc the compiler version determines which c++11 features are available.
# Both variadic templates and delegating constructors support exist in
# all versions that we write compile headers for.
if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC" AND
";${CMAKE_CXX_COMPILE_FEATURES};" MATCHES ";cxx_delegating_constructors;")
list(APPEND true_defs EXPECTED_COMPILER_CXX_DELEGATING_CONSTRUCTORS)
list(APPEND true_defs EXPECTED_COMPILER_CXX_VARIADIC_TEMPLATES)
else(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
list(APPEND false_defs EXPECTED_COMPILER_CXX_DELEGATING_CONSTRUCTORS)
list(APPEND false_defs EXPECTED_COMPILER_CXX_VARIADIC_TEMPLATES)
endif()
Features: Quote all compiler names when comparing with COMPILER_ID In preparation of adding MSVC support we need to quote all compiler names, as MSVC is also a CMake variable.
2015-01-06 21:31:30 +03:00
if (CMAKE_C_COMPILER_ID STREQUAL "GNU"
OR CMAKE_C_COMPILER_ID STREQUAL "Clang"
OR CMAKE_C_COMPILER_ID STREQUAL "AppleClang")
WCDH: Make the header -Wundef safe for the C language. The __STDC_VERSION__ macro may be defined or not depending on the implementation dialect of C. Test that it is defined before testing its value. The CXX tests do not need such a change because they define __cplusplus in all dialects.
2014-11-24 23:47:48 +03:00
add_executable(C_undefined c_undefined.c)
set_property(TARGET C_undefined PROPERTY CXX_STANDARD 90)
target_compile_options(C_undefined PRIVATE -Werror=undef)
endif()
Add the WriteCompilerDetectionHeader module. Provide a function to write a portable header to detect compiler features. Generate a preprocessor #error for unknown compilers and compiler versions whose features are not yet recorded. This error condition might be relaxed in the future, but for now it is useful for verification of expectations.
2013-10-21 18:59:40 +04:00
add_executable(WriteCompilerDetectionHeader main.cpp)
set_property(TARGET WriteCompilerDetectionHeader PROPERTY CXX_STANDARD 98)
set_defines(WriteCompilerDetectionHeader "${true_defs}" "${false_defs}")
WCDH: Make it possible to generate multiple files. Extend the write_compiler_detection_header interface to allow specifying a location for supplementary files, and getting the list of resulting files as a variable.
2014-10-31 02:41:53 +03:00
write_compiler_detection_header(
FILE "${CMAKE_CURRENT_BINARY_DIR}/compiler_multi_files/multi_file_compiler_detection.h"
PREFIX MULTI
OUTPUT_FILES_VAR multi_files
OUTPUT_DIR "${CMAKE_CURRENT_BINARY_DIR}/compiler_multi_files/compiler_support"
Features: Enable writing of MSVC compiler feature header. Notes: VS2015 and above are the only MSVC versions to support cxx_final, so remove usages from the tests, and instead only test for cxx_override. VS2012 and above to conform to cxx_decltype_incomplete_return_types proposal, but without support for auto return types the dcl.type.simple example in the proposal doesn't compile. VS2013 and above to conform to the updated cxx_contextual_conversions proposal, but VS2010 and above pass the test. Compilers such as MSVC have no explicit flags to enable C++11 mode, it just is always on. So only run the link tests with compilers that require a flag to specify the language version.
2015-01-06 21:19:44 +03:00
COMPILERS GNU Clang AppleClang MSVC
WCDH: Make it possible to generate multiple files. Extend the write_compiler_detection_header interface to allow specifying a location for supplementary files, and getting the list of resulting files as a variable.
2014-10-31 02:41:53 +03:00
VERSION 3.1
FEATURES
${cxx_known_features} ${c_known_features}
)
add_executable(multi_files multi_files.cpp)
set_property(TARGET multi_files PROPERTY CXX_STANDARD 98)
target_include_directories(multi_files PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/compiler_multi_files)
set_defines(multi_files "${true_defs}" "${false_defs}")
Add the WriteCompilerDetectionHeader module. Provide a function to write a portable header to detect compiler features. Generate a preprocessor #error for unknown compilers and compiler versions whose features are not yet recorded. This error condition might be relaxed in the future, but for now it is useful for verification of expectations.
2013-10-21 18:59:40 +04:00
if(MSVC)
return() # MSVC has only one mode.
endif()
# Since GNU 4.7
if (";${CMAKE_CXX_COMPILE_FEATURES};" MATCHES ";cxx_delegating_constructors;")
list(APPEND true_defs EXPECTED_COMPILER_CXX_DELEGATING_CONSTRUCTORS)
list(REMOVE_ITEM false_defs EXPECTED_COMPILER_CXX_DELEGATING_CONSTRUCTORS)
endif()
# Since GNU 4.4
if (";${CMAKE_CXX_COMPILE_FEATURES};" MATCHES ";cxx_variadic_templates;")
list(APPEND true_defs EXPECTED_COMPILER_CXX_VARIADIC_TEMPLATES)
list(REMOVE_ITEM false_defs EXPECTED_COMPILER_CXX_VARIADIC_TEMPLATES)
endif()
add_executable(WriteCompilerDetectionHeader_11 main.cpp)
set_property(TARGET WriteCompilerDetectionHeader_11 PROPERTY CXX_STANDARD 11)
set_defines(WriteCompilerDetectionHeader_11 "${true_defs}" "${false_defs}")
WCDH: Make it possible to generate multiple files. Extend the write_compiler_detection_header interface to allow specifying a location for supplementary files, and getting the list of resulting files as a variable.
2014-10-31 02:41:53 +03:00
add_executable(multi_files_11 multi_files.cpp)
set_property(TARGET multi_files_11 PROPERTY CXX_STANDARD 11)
target_include_directories(multi_files_11 PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/compiler_multi_files)
set_defines(multi_files_11 "${true_defs}" "${false_defs}")