1 include(${CMAKE_CURRENT_LIST_DIR}/cm_message_checks_compat.cmake)
3 function(cm_check_cxx_feature name)
4 set(TRY_RUN_FEATURE "${ARGN}")
5 string(TOUPPER ${name} FEATURE)
6 if(NOT DEFINED CMake_HAVE_CXX_${FEATURE})
7 cm_message_checks_compat(
8 "Checking if compiler supports C++ ${name}"
9 __checkStart __checkPass __checkFail)
10 message(${__checkStart})
11 if(CMAKE_CXX_STANDARD)
12 set(maybe_cxx_standard -DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD})
14 set(maybe_cxx_standard "")
17 try_run(CMake_RUN_CXX_${FEATURE} CMake_COMPILE_CXX_${FEATURE}
18 ${CMAKE_CURRENT_BINARY_DIR}
19 ${CMAKE_CURRENT_LIST_DIR}/cm_cxx_${name}.cxx
20 CMAKE_FLAGS ${maybe_cxx_standard}
21 OUTPUT_VARIABLE OUTPUT
23 if (CMake_RUN_CXX_${FEATURE} EQUAL "0" AND CMake_COMPILE_CXX_${FEATURE})
24 set(CMake_HAVE_CXX_${FEATURE} ON CACHE INTERNAL "TRY_RUN" FORCE)
26 set(CMake_HAVE_CXX_${FEATURE} OFF CACHE INTERNAL "TRY_RUN" FORCE)
29 try_compile(CMake_HAVE_CXX_${FEATURE}
30 ${CMAKE_CURRENT_BINARY_DIR}
31 ${CMAKE_CURRENT_LIST_DIR}/cm_cxx_${name}.cxx
32 CMAKE_FLAGS ${maybe_cxx_standard}
33 OUTPUT_VARIABLE OUTPUT
36 set(check_output "${OUTPUT}")
37 # Filter out MSBuild output that looks like a warning.
38 string(REGEX REPLACE " +0 Warning\\(s\\)" "" check_output "${check_output}")
39 # Filter out MSBuild output that looks like a warning.
40 string(REGEX REPLACE "[^\n]*warning MSB[0-9][0-9][0-9][0-9][^\n]*" "" check_output "${check_output}")
41 # Filter out warnings caused by user flags.
42 string(REGEX REPLACE "[^\n]*warning:[^\n]*-Winvalid-command-line-argument[^\n]*" "" check_output "${check_output}")
43 # Filter out warnings caused by local configuration.
44 string(REGEX REPLACE "[^\n]*warning:[^\n]*directory not found for option[^\n]*" "" check_output "${check_output}")
45 string(REGEX REPLACE "[^\n]*warning:[^\n]*object file compiled with -mlong-branch which is no longer needed[^\n]*" "" check_output "${check_output}")
46 # Filter out other warnings unrelated to feature checks.
47 string(REGEX REPLACE "[^\n]*warning:[^\n]*sprintf\\(\\) is often misused, please use snprintf[^\n]*" "" check_output "${check_output}")
48 # Filter out libhugetlbfs warnings.
49 string(REGEX REPLACE "[^\n]*libhugetlbfs [^\n]*: WARNING[^\n]*" "" check_output "${check_output}")
50 # Filter out xcodebuild warnings.
51 string(REGEX REPLACE "[^\n]* xcodebuild\\[[0-9]*:[0-9]*\\] warning: [^\n]*" "" check_output "${check_output}")
52 # Filter out icpc warnings
53 string(REGEX REPLACE "[^\n]*icpc: command line warning #10121: overriding [^\n]*" "" check_output "${check_output}")
54 # Filter out ld warnings.
55 string(REGEX REPLACE "[^\n]*ld: warning: [^\n]*" "" check_output "${check_output}")
56 # If using the feature causes warnings, treat it as broken/unavailable.
57 if(check_output MATCHES "(^|[ :])[Ww][Aa][Rr][Nn][Ii][Nn][Gg]")
58 set(CMake_HAVE_CXX_${FEATURE} OFF CACHE INTERNAL "TRY_COMPILE" FORCE)
60 if(CMake_HAVE_CXX_${FEATURE})
61 message(${__checkPass} "yes")
62 file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
63 "Determining if compiler supports C++ ${name} passed with the following output:\n"
68 message(${__checkFail} "no")
69 file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
70 "Determining if compiler supports C++ ${name} failed with the following output:\n"
78 cm_check_cxx_feature(make_unique)
79 if(CMake_HAVE_CXX_MAKE_UNIQUE)
80 set(CMake_HAVE_CXX_UNIQUE_PTR 1)
82 cm_check_cxx_feature(unique_ptr)
83 if (NOT CMAKE_CXX_STANDARD LESS "17")
84 if (NOT CMAKE_CROSSCOMPILING OR CMAKE_CROSSCOMPILING_EMULATOR)
85 cm_check_cxx_feature(filesystem TRY_RUN)
87 # In cross-compiling mode, it is not possible to check implementation bugs
88 # so rely only on conformance done by compilation
89 cm_check_cxx_feature(filesystem)
92 set(CMake_HAVE_CXX_FILESYSTEM FALSE)