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detecting need to link with stdfs

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This commit is contained in:
Erik Fröjdh 2024-11-18 15:19:57 +01:00
parent 37d3dfcf71
commit 30d05f9203
2 changed files with 51 additions and 1 deletions
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12
CMakeLists.txt
View File

@ -22,6 +22,8 @@ include(FetchContent)
#Set default build type if none was specified
include(cmake/helpers.cmake)
default_build_type("Release")
link_std_fs()
message(STATUS fs_lib:${STD_FS_LIB})
set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake" ${CMAKE_MODULE_PATH})
@ -310,7 +312,15 @@ target_include_directories(aare_core PUBLIC
"$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>"
)
target_link_libraries(aare_core PUBLIC fmt::fmt nlohmann_json::nlohmann_json PRIVATE aare_compiler_flags )
target_link_libraries(
aare_core
PUBLIC
fmt::fmt
nlohmann_json::nlohmann_json
${STD_FS_LIB} # from helpers.cmake
PRIVATE
aare_compiler_flags
)
set_target_properties(aare_core PROPERTIES
ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}

40
cmake/helpers.cmake
View File

@ -4,3 +4,43 @@ if (NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
set(CMAKE_BUILD_TYPE ${val} CACHE STRING "Build type (default ${val})" FORCE)
endif()
endfunction()
function(link_std_fs)
# from pybind11
# Check if we need to add -lstdc++fs or -lc++fs or nothing
if(DEFINED CMAKE_CXX_STANDARD AND CMAKE_CXX_STANDARD LESS 17)
set(STD_FS_NO_LIB_NEEDED TRUE)
elseif(MSVC)
set(STD_FS_NO_LIB_NEEDED TRUE)
else()
file(
WRITE ${CMAKE_CURRENT_BINARY_DIR}/main.cpp
"#include <filesystem>\nint main(int argc, char ** argv) {\n std::filesystem::path p(argv[0]);\n return p.string().length();\n}"
)
try_compile(
STD_FS_NO_LIB_NEEDED ${CMAKE_CURRENT_BINARY_DIR}
SOURCES ${CMAKE_CURRENT_BINARY_DIR}/main.cpp
COMPILE_DEFINITIONS -std=c++17)
try_compile(
STD_FS_NEEDS_STDCXXFS ${CMAKE_CURRENT_BINARY_DIR}
SOURCES ${CMAKE_CURRENT_BINARY_DIR}/main.cpp
COMPILE_DEFINITIONS -std=c++17
LINK_LIBRARIES stdc++fs)
try_compile(
STD_FS_NEEDS_CXXFS ${CMAKE_CURRENT_BINARY_DIR}
SOURCES ${CMAKE_CURRENT_BINARY_DIR}/main.cpp
COMPILE_DEFINITIONS -std=c++17
LINK_LIBRARIES c++fs)
endif()
if(${STD_FS_NEEDS_STDCXXFS})
set(STD_FS_LIB stdc++fs)
elseif(${STD_FS_NEEDS_CXXFS})
set(STD_FS_LIB c++fs)
elseif(${STD_FS_NO_LIB_NEEDED})
set(STD_FS_LIB "")
else()
message(WARNING "Unknown C++17 compiler - not passing -lstdc++fs")
set(STD_FS_LIB "")
endif()
endfunction()