Correct way to link std::filesystem with GCC 8?

Dakon · September 20, 2021, 6:22pm

I had the same issue in OSM2go, and that’s how I solved it:

osm2go/osm2go/blob/master/find_filesystem.cmake

# SPDX-License-Identifier: GPL-3.0-or-later
# SPDX-FileCopyrightText: 2018 Rolf Eike Beer <eike@sf-mail.de>.

# find out if std::filesystem can be used

set(FS_TESTCODE
"
#if defined(CXX17_FILESYSTEM) || defined (CXX17_FILESYSTEM_LIBFS)
#include <filesystem>
#elif defined(CXX11_EXP_FILESYSTEM) || defined (CXX11_EXP_FILESYSTEM_LIBFS)
#include <experimental/filesystem>
namespace std {
	namespace filesystem {
		using experimental::filesystem::is_regular_file;
	}
}
#endif

int main(void)
{

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Maybe I’ll rewrite it to use targets one day.

Eike