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Re: Where does _environ come from?

At 12:03 PM -0800 1/7/04, Kevin Hoyt wrote: 
I have several projects in Xcode, one of which builds a framework.  The
link step for the framework project fails because '_environ' is not
defined.  This is not an issue for my other command line tools, which use
the same code base.  I've compared the projects and they appear to be
linking against the same set of system frameworks.

Any suggestions on why the framework project can't find _environ when the
command line tool projects do?

_environ is defined in /usr/lib/crt1.o, which is only linked into executables. The corresponding file for dylibs (which frameworks use) is /usr/lib/dylib1.o and doesn't define _environ. Annoying as that is, it's correct because otherwise your library's _environ would be different from the _environ of the executable that loaded it.

If you want to use _environ in a library on Mac OS X, you should use *_NSGetEnviron() instead. It's defined in /usr/include/crt_externs.h.

Hope this helps,
Eric
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