I'm thinking about using PhysicsFS in my game engine project, but I'd like to first make sure it's entirely platform-independent. That's because I'd like to port my engine to some rather obscure platforms after I'm done with the Windows code (Wii Homebrew, for example).
In accordance with the official specs the developers provide on their site it:
Compiles/runs on GNU/Linux (x86, PPC, MIPS, Sparc, Alpha, Itanium, and x86-64 tested; gcc). Compiles/runs on Windows, Win95 and later (x86 tested; Visual C++, Visual Studio, Cygwin, and MinGW). Compiles/runs on Mac OS X (x86 and PPC tested; XCode).
And even
May compile and run elsewhere with little to no modification. Success stories and patches are welcome.
So the answer is Yes, it is platform-independent.
Following @rubenvb advice, I'd better define it as a cross-platform library. That's because PhysicsFS library utilizes #ifdefs and provides particular implementations for Windows, BeOS / Haiku, Mac OS X, OS/2, PocketPC, POSIX and UNIX platforms.