What to link against for utils::Path

[yuzeni]

This might be a silly question, but I can't figure out what I need to link against to get the functionality in utils/Path.h. 'libutils' doesn't do the trick.
Here is what I have tried:

On Linux:

1. Get the latest release
2. Follow the steps in the README.md for the minimal filament project.
3. Replace the suggested main.cpp with this:

#include <filament/FilamentAPI.h>
#include <utils/Path.h>
int main() {
    auto path = utils::Path("");
    path.getName();
}

Executing make will fail with an 'undefined reference' error for getName().
Full output:

clang++ -Iinclude/ -std=c++17 -pthread -c main.cpp
clang++ -Llib/x86_64/ main.o -lfilament -lbackend -lbluegl -lbluevk -lfilabridge -lfilaflat -lutils -lgeometry -lsmol-v -lvkshaders -libl -lpthread -lc++ -ldl -o main
/usr/bin/ld: main.o: in function `main':
main.cpp:(.text+0x2c): undefined reference to `utils::Path::getName[abi:cxx11]() const'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [Makefile:5: main] Fehler 1

On Windows:

Fails to compile with just

#include <filament/FilamentAPI.h>
#include <utils/Path.h>
int main() {
    auto path = utils::Path("");
}

Linking with all the libraries in the libs folder and shuffeling the order also didn't work.
I tried to be thorough and not miss the obvious. Hoping I am not wasting anyone's time with this.

[poweifeng]

Did you build libutils locally? specifically, how did you get the library.

[yuzeni]

Hi, nothing was built locally. Although I have also tried that and failed :)
I simply downloaded the latest release.

[yuzeni]

Okay, here is the solution I found. Adding the flag -stdlib=libc++ for the compilation of main fixed the issue.
This is probably because of my Ubuntu defaulting to GCC for everything, so I need the explicit flag.
It would be nice if you could add this to the suggested Makefile in the linux section of the README.md inside the Release folder.

For context, the original Makefile:

FILAMENT_LIBS=-lfilament -lbackend -lbluegl -lbluevk -lfilabridge -lfilaflat -lutils -lgeometry -lsmol-v -lvkshaders -libl
CC=clang++

main: main.o
	$(CC) -Llib/x86_64/ main.o $(FILAMENT_LIBS) -lpthread -lc++ -ldl -o main

main.o: main.cpp
	$(CC) -Iinclude/ -std=c++17 -pthread -c main.cpp

clean:
	rm -f main main.o

.PHONY: clean

And now with the fix:

FILAMENT_LIBS=-lfilament -lbackend -lbluegl -lbluevk -lfilabridge -lfilaflat -lutils -lgeometry -lsmol-v -lvkshaders -libl
CC=clang++

main: main.o
	$(CC) -Llib/x86_64/ main.o $(FILAMENT_LIBS) -lpthread -lc++ -ldl -o main

main.o: main.cpp
	$(CC) -Iinclude/ -std=c++17 -stdlib=libc++ -pthread -c main.cpp

clean:
	rm -f main main.o

.PHONY: clean