Re: c99, autoconf and a couple compilers

[Bruno Haible]

Hi Eric,

> I'm installing the following to autoconf (and
> wonder if something similar should be done in gnulib):
> 
> 2007-09-25  Eric Blake  <address@hidden>
> 
>       Improve C99 detection.
>       * lib/autoconf/c.m4 (_AC_PROG_CC_C99): Add support for HP cc, and
>       avoid deprecation warning with icc.

While certainly fine for autoconf, why should gnulib override such basic
autoconf macros?
  - gnulib should also work when C99 mode cannot be enabled.
  - The user can also set the variable CC="cc -AC99" himself; a package's
    INSTALL file can recommend this.

Bruno