Re: [PATCH] Compilation warnings, configure

[Werner Koch <wk@xxxxxxxxx>]

On Wed,  4 Apr 2007 09:50, grobian@xxxxxxxxxxxxxx said:

> I just think -Werror can be useful.  Whether you add it using a
> --enable-werror or some variable that you can set yourself doesn't

FWIW, you may use code like this to test for gcc features:
  
  if test "$GCC" = yes; then
      # Note that it is okay to use CFLAGS here because these are just
      # warning options and the user should have a chance of overriding
      # them.
      AC_MSG_CHECKING([if gcc supports -Wno-pointer-sign])
      _gcc_cflags_save=$CFLAGS
      CFLAGS="-Wno-pointer-sign"
      AC_COMPILE_IFELSE(AC_LANG_PROGRAM([]),_gcc_psign=yes,_gcc_psign=no)
      AC_MSG_RESULT($_gcc_psign)
      CFLAGS=$_gcc_cflags_save;
      if test x"$_gcc_psign" = xyes ; then
         CFLAGS="$CFLAGS -Wno-pointer-sign"
      fi
  fi



Shalom-Salam,

   Werner