G_HAVE_ISO_VARARGS

[Joel Becker <jlbec evilplan org>]

Folks,
	AFAICT, glibconfig.h sets G_HAVE_ISO_VARARGS if configure finds
the compiler can do them.  They are then activated merely by default.
Unfortunately, this breaks anyone using -ansi -pedantic (because those
still specify c89).  A prime example is abiword and wv.  We're currently
porting them up to gtk 2 in house, and, well, it doesn't work.  It did a
couple weeks ago, when the gmessage.h macros checked __STDC_VERSION__.
	I would suggest that the G_HAVE_ISO_VARARGS macro in
glibconfig.h read:

#if defined (G_HAVE_ISO_VARARGS) && defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L

	In this fashion, folks building with -ansi -pedantic will
successfully use glib,a nd folks using c99 will as well.

Joel

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