Is Gnulib still targeting C89?

[Paul Eggert]

Pádraig Brady wrote:
> In general gnulib is still targeting c89 right?
> BTW, when should we update that requirement?

Now is a good time. As far as I know, no Gnulib-using application still requires 
porting to C89-only platforms. Although we still may have some issues with old C 
libraries that support C89 but not C99 behavior, we no longer need to worry 
about porting to C89-only compilers. In other words, all platforms that we care 
about now have a compiler available that supports significant C99 features (even 
if it does not support full C99).

With that in mind, I propose (and have installed) the attached patch to try to 
document the current situation more accurately. Comments and further patches are 
welcome.

0001-Target-a-C99-subset-not-a-C89-subset.patch
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