Font cannot be loaded with Emscripten but with g++ - c++

Question

I am trying to use FreeType the first time with OpenGL in C/C++ with this tutorial: https://learnopengl.com/In-Practice/Text-Rendering.
#include <iostream>
#include <ft2build.h>
#include FT_FREETYPE_H
FT_Library ft;
FT_Face face;
int main(int argc, char** argv)
{
FT_Init_FreeType(&ft);
if (FT_New_Face(ft, "/usr/share/fonts/truetype/malayalam/Uroob-Regular.ttf", 0, &face))
{
std::cout << "Font could not be loaded" << std::endl;
return -1;
}
}
Now when I try to compile this it works with g++ so far as there is no error output, but with em++ (Emscripten) the font cannot be loaded as the error output "Font could not be loaded" then indicates.
I do not need THIS kind of font "Uroob-Regular.ttf", any readable Latin font would do it for me. I am under Ubuntu.
I use the flag -s USE_FREETYPE=1 with Emscripten.

Answer 1

It seems like Emscripten cannot find files below the current directory, because when I try to compile it with --preload-file "/usr/share/fonts/truetype/malayalam/Uroob-Regular.ttf" to help it find the font it indicates: "Embedding "/usr/share/fonts/truetype/malayalam/Uroob-Regular.ttf" which is below the current directory "xxx". This is invalid since the current directory becomes the root that the generated code will see".
I don't know if this is a valid way to do so, but then I put the font file in the same directory as the cpp file. Then I used --preload-file "Uroob-Regular.ttf" and changed the corresponding code line to if (FT_New_Face(ft, "Uroob-Regular.ttf", 0, &face)) and it worked for both Emscripten and g++.