c++ and whole-program optimization

[Philippe Suter]

Hi everyone,

I tried compiling a C++ project using the --combine and
--whole-program flags, and passing all source files at once, but I get
linker errors for essentially all functions called from main(). I seem
to remember that I read somewhere that --combine and --whole-program
only work with C code.. Is this a confirmed fact and the reason I'm
getting these errors, or am I missing something?

Thanks in advance,
PS