compiling on a mac: library 'stdc++fs' not found

[mchernos]

Hi,

When compiling on MacOS, using make GCC we get the following error (tested on several macs from 2018 onwards):

ld: library 'stdc++fs' not found
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [GCC] Error 1

Following https://stackoverflow.com/questions/74891427/make-error-library-not-found-for-lstdcfs we were able to compile by removing the -lstdc++fs in the makefile. i.e.

GCC:	$(SRC_FILES_CPP) $(SRC_FILES_C)
	g++ -std=c++17 -I$(INCLUDE_DIR) -I$(MPI_MEM_INCLUDE) $(SRC_FILES_CPP) $(MEM_FILES_C) -ldl -o Ostrich
	rm -f *.o

[dloney]

I think this is most likely a structural difference between Mac and Linux C++ libraries and compiler versions. I just recompiled again today on Linux, and the flag was necessary to include it on relatively new versions of RedHad and OpenSUSE. @lbearup We could modify the make file with an architecture input that would disable the filesystem flag until all the GCC compilers came standard with it?