Configure for what project?

Oh, the project I'm trying to build. Not emscripten itself.

Which project is it, out of curiosity? And what is NSGetEnviron?

tor

_NSGetEnviron() is used to get direct access to environ on OS X

And what header is it defined in? If configure checks for it, it must be in some system header of ours? Otherwise what is configure looking for?

It's defined in crt_externs.h on my system but nowhere in emscripten, hence the pull.

The configure file check is generated with automake's,

AC_CHECK_FUNCS(
    _NSGetEnviron \
    ...
)

I guess that bypasses whatever emconfigure does to ensure checks are against emscripten's system.

That header file is not part of emscripten though. I guess it's a system header on your machine?

We can't implement stuff in our library files that is specific to some system. In principle, configure should not be looking in your system headers, just the portable emscripten ones.

Indeed, it's a system header on my machine and, unfortunately, in practice, configure is looking at it.

I guess a better patch would be to figure why that is and try to prevent it. Thanks for the help.

I think the right solution is to modify that configure to be more friendly to cross-compilers (like emscripten), and not look at hardcoded paths to system headers. I am not sure there is something more general we can do.