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Allows compilation on older gcc #27

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Allows compilation on older gcc #27

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31 changes: 31 additions & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -4,11 +4,42 @@ project(argparse VERSION 1.4.0 LANGUAGES CXX)

include(GNUInstallDirs)


include(CheckCXXSourceCompiles)
set(CMAKE_REQUIRED_FLAGS "--std=c++17")
check_cxx_source_compiles(
"#include <filesystem>
int main() {
std::filesystem::path(\"foo\");
return 0;
}"
ARGPARSE_HAS_FILESYSTEM)
if(NOT ARGPARSE_HAS_FILESYSTEM)
set(CMAKE_REQUIRED_LIBRARIES "-lstdc++fs")
check_cxx_source_compiles(
"#include <experimental/filesystem>
int main() {
std::experimental::filesystem::path(\"foo\");
return 0;
}"
ARGPARSE_HAS_EXPERIMENTAL_FILESYSTEM)
if(NOT ARGPARSE_HAS_EXPERIMENTAL_FILESYSTEM)
message(
FATAL_ERROR
"Compiler does not have either <filesystem> or <experimental/filesystem> support"
)
endif()
endif()

# installing the header-only-library
add_library(${PROJECT_NAME} INTERFACE)
add_library(morrisfranken::argparse ALIAS argparse)

target_compile_features(argparse INTERFACE cxx_std_17)
if(ARGPARSE_HAS_EXPERIMENTAL_FILESYSTEM)
target_compile_definitions(argparse INTERFACE "-DARGPARSE_USE_EXPERIMENTAL_FS=1")
target_link_libraries(argparse INTERFACE "-lstdc++fs")
endif()
target_include_directories(argparse INTERFACE
$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include>)
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7 changes: 7 additions & 0 deletions include/argparse/argparse.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -35,7 +35,14 @@
#include <memory> // for allocator, shared_ptr, __shared_ptr_ac...
#include <optional> // for optional, nullopt
#include <stdexcept> // for runtime_error, invalid_argument
#ifdef ARGPARSE_USE_EXPERIMENTAL_FS
#include <experimental/filesystem>
namespace std {
namespace filesystem = experimental::filesystem;
}
#else
#include <filesystem> // for getting program_name from path
#endif
#include <string> // for string, operator+, basic_string, char_...
#include <type_traits> // for declval, false_type, true_type, is_enum
#include <utility> // for move, pair
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