RFC: Changing AC_PROG_CC to AC_PROG_CC_C99 in top level configure

[Nick Clifton]

Hi Joseph,

> This isn't an objection, since upgrading auto* for the toolchain can be
> complicated, but note that AC_PROG_CC_C99 is obsolete in Autoconf 2.70 

Ah - in which case changing to an about-to-be-obsolete macro is probably 
a bad idea.

> and instead AC_PROG_CC enables C11 mode if supported.  (So moving to the
> latest Autoconf and Automake releases would supersede this change.)

Makes sense.  Is changing to autoconf 2.70 something that is planned for 
the near future ?

I actually have a Fedora BZ open suggesting that the binutils be 
upgraded to use autoconf 2.71.  I have put off doing this however as I 
am not an autoconf expert and I have no idea what the consequences might be.

Cheers
   Nick