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check_cxx_source_compiles FILESYSTEM

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This commit is contained in:
qPCR4vir 2019-11-05 19:25:14 +01:00
parent 25353e4325
commit babcdb477d
1 changed files with 96 additions and 5 deletions
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101
build/cmake/select_filesystem.cmake
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@ -13,7 +13,8 @@
option(NANA_CMAKE_NANA_FILESYSTEM_FORCE "Force nana filesystem over ISO and boost?" OFF)
option(NANA_CMAKE_STD_FILESYSTEM_FORCE "Use of STD filesystem?(a compilation error will ocurre if not available)" OFF)
option(NANA_CMAKE_BOOST_FILESYSTEM_FORCE "Force use of Boost filesystem if available (over STD)?" OFF)
option(NANA_CMAKE_FIND_BOOST_FILESYSTEM "Search: Is Boost filesystem available?" OFF)
set (TEST_FS_LIB OFF)
if(NANA_CMAKE_NANA_FILESYSTEM_FORCE)
if(NANA_CMAKE_STD_FILESYSTEM_FORCE)
@ -48,11 +49,101 @@ elseif(NANA_CMAKE_BOOST_FILESYSTEM_FORCE)
set(Boost_USE_STATIC_RUNTIME ON)
else()
# todo test for std (for now just force nana or boost if there no std)
target_link_libraries (nana PUBLIC stdc++fs)
# todo if not test for boost
# if not add nana filesystem
if(NANA_CMAKE_STD_FILESYSTEM_FORCE)
target_compile_definitions(nana PUBLIC STD_FILESYSTEM_FORCE)
endif()
check_include_file_cxx (filesystem NANA_HAVE_FILESYSTEM)
check_include_file_cxx (experimental/filesystem NANA_HAVE_EXP_FILESYSTEM)
if (NANA_HAVE_FILESYSTEM)
message (STATUS "C++ Filesystem header: <filesystem>")
set (TEST_FS_LIB ON)
set (CXXSTD_TEST_SOURCE
"#include <filesystem>
int main()
{
std::filesystem::path p{\"\tmp/\"};
throw std::filesystem::filesystem_error(\"Empty file name!\", std::make_error_code(std::errc::invalid_argument));
}")
elseif (NANA_HAVE_EXP_FILESYSTEM)
message (STATUS "C++ Filesystem header: <experimental/filesystem>")
set (TEST_FS_LIB ON)
set (CXXSTD_TEST_SOURCE
"#include <experimental/filesystem>
int main()
{
std::experimental::filesystem::path p{\"/tmp/\"};
throw std::experimental::filesystem::filesystem_error(\"Empty file name!\", std::make_error_code(std::errc::invalid_argument));
}")
else ()
message (WARNING "No std::filesystem found: nana::filesystem will be used.
Set NANA_CMAKE_NANA_FILESYSTEM_FORCE to ON to avoid this warning.")
target_compile_definitions(nana PUBLIC STD_FILESYSTEM_NOT_SUPPORTED)
set (TEST_FS_LIB OFF)
endif ()
if (TEST_FS_LIB)
include (FindPackageMessage)
include (CheckIncludeFileCXX)
include (CheckCXXSourceCompiles)
# CMAKE_REQUIRED_FLAGS = string of compile command line flags
# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
# CMAKE_REQUIRED_INCLUDES = list of include directories
set (CMAKE_REQUIRED_INCLUDES ${CMAKE_INCLUDE_PATH})
set (CMAKE_REQUIRED_FLAGS ${CMAKE_CXX_FLAGS})
set (CMAKE_REQUIRED_FLAGS_ORIGINAL ${CMAKE_REQUIRED_FLAGS})
set (CXXSTD_TEST_SOURCE
"#if !defined (__cplusplus) || (__cplusplus < 201703L)
#error NOCXX17
#endif
int main() {}")
check_cxx_source_compiles ("${CXXSTD_TEST_SOURCE}" CXX17_BUILTIN)
if (CXX17_BUILTIN)
message (STATUS "C++ Standard-17 support: builtin")
else ()
set (CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS_ORIGINAL} -std=c++17")
check_cxx_source_compiles ("${CXXSTD_TEST_SOURCE}" CXX17_FLAG)
if (CXX17_FLAG)
message (STATUS "C++ Standard-17 support: via -std=c++17")
else ()
message (WARNING "nana requires C++17??, but your compiler does not support it.")
endif ()
endif ()
set (CMAKE_REQUIRED_LIBRARIES_ORIGINAL ${CMAKE_REQUIRED_LIBRARIES})
check_cxx_source_compiles ("${CXXSTD_TEST_SOURCE}" C++17FS_BUILTIN)
if (C++17FS_BUILTIN)
message (STATUS "C++ Filesystem library: builtin")
else ()
set (C++17FS_LIB "")
foreach (_LIB stdc++fs)
set (CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES_ORIGINAL} ${_LIB})
check_cxx_source_compiles ("${CXXSTD_TEST_SOURCE}" C++17FS_LIB-l${_LIB})
message (STATUS "C++ Filesystem library: testing -l${_LIB}")
if (C++17FS_LIB-l${_LIB})
target_link_libraries (nana PUBLIC ${_LIB})
message (STATUS "C++ Filesystem library: via -l${_LIB}")
set (C++17FS_LIB ${_LIB})
break ()
endif ()
set (CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES_ORIGINAL})
endforeach ()
if (C++17FS_LIB)
message (STATUS "C++ Filesystem library: via -l${C++17FS_LIB}")
else ()
message (WARNING "No std::filesystem library found: nana::filesystem will be used.
Set NANA_CMAKE_NANA_FILESYSTEM_FORCE to ON to avoid this warning.")
target_compile_definitions(nana PUBLIC STD_FILESYSTEM_NOT_SUPPORTED)
endif ()
endif ()
endif ()
endif()