First Commit

ext/libpqxx-7.7.3/config-tests/need_fslib.cxx

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+// Check whether we need to link to the stdc++fs library.
+//
+// We assume that the presence of the <filesystem> header means that we have
+// support for the basics of std::filesystem.  This check will succeed if
+// either there is no <filesystem> header, or there is one and it works without
+// any special options.  If the link fails, we assume that -lstdc++fs will fix
+// it for us.
+
+#include <iostream>
+
+#if __has_include(<filesystem>)
+#  include <filesystem>
+#endif
+
+
+int main()
+{
+#if __has_include(<filesystem>)
+  std::cout << std::filesystem::path{"foo.bar"}.c_str() << '\n';
+#endif
+}