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[cmake] Use FindFilesystem instead of own code

pull/1142/head
Hleb Valoshka 2021-10-20 18:44:02 +04:00
parent 5f050040fe
commit 481f81c664
3 changed files with 8 additions and 41 deletions
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35
CMakeLists.txt
View File

@ -343,36 +343,17 @@ include_directories("${CMAKE_SOURCE_DIR}/src" ${CMAKE_BINARY_DIR})
include(CheckSymbolExists)
check_symbol_exists(wordexp wordexp.h HAVE_WORDEXP)
check_include_files(byteswap.h HAVE_BYTESWAP_H)
try_compile(HAVE_FILESYSTEM ${CMAKE_BINARY_DIR} "${CMAKE_SOURCE_DIR}/checks/cxxfs.cpp")
check_include_file_cxx(experimental/filesystem HAVE_EXPERIMENTAL_FILESYSTEM)
if((NOT HAVE_FILESYSTEM) AND HAVE_EXPERIMENTAL_FILESYSTEM)
# Try compile without linking against any library
try_compile(CXXFSLIB ${CMAKE_BINARY_DIR} "${CMAKE_SOURCE_DIR}/checks/cxxfsexp.cpp")
if(CXXFSLIB)
# Nothing to do, linking is not explicitly required
find_package(Filesystem)
if(Filesystem_FOUND)
if(CXX_FILESYSTEM_IS_EXPERIMENTAL)
set(HAVE_EXPERIMENTAL_FILESYSTEM ON)
else()
# Find the filesystem lib we need to link against
if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
find_library(CLANG_FS_LIBRARY "c++fs")
if(CLANG_FS_LIBRARY)
set(FS_LIBRARY c++fs)
else()
set(FS_LIBRARY stdc++fs)
endif()
elseif(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
set(FS_LIBRARY stdc++fs)
endif()
try_compile(CXXFSLIB ${CMAKE_BINARY_DIR} "${CMAKE_SOURCE_DIR}/checks/cxxfs.cpp" LINK_LIBRARIES "${FS_LIBRARY}")
if(CXXFSLIB)
link_libraries("${FS_LIBRARY}")
else()
set(HAVE_EXPERIMENTAL_FILESYSTEM OFF)
message(WARNING "C++ experimental filesystem library is unusable!\nWill use own implementation.")
endif()
set(HAVE_FILESYSTEM ON)
endif()
link_libraries(std::filesystem)
else()
message(WARNING "C++ experimental filesystem library is unusable!\nWill use own implementation.")
endif()
try_compile(HAVE_STRING_VIEW ${CMAKE_BINARY_DIR} "${CMAKE_SOURCE_DIR}/checks/cxxsv.cpp")

7
checks/cxxfs.cpp
View File

@ -1,7 +0,0 @@
#include <filesystem>
int main()
{
std::error_code ec;
throw std::filesystem::filesystem_error("test", ec);
}

7
checks/cxxfsexp.cpp
View File

@ -1,7 +0,0 @@
#include <experimental/filesystem>
int main()
{
std::error_code ec;
throw std::experimental::filesystem::filesystem_error("test", ec);
}