Re: if (...) then; AC_PROG_CC else AC_PROG_CC fi doesn't work?

[Eric Blake]

Brooks Moses <brooks.moses <at> codesourcery.com> writes:

> Thanks!  Unfortunately, however, that "fixes" it by breaking the desired 
> functionality.  The point of enable_foo is not the echo statements, but 
> the fact that AC_PROG_CC uses the "[gcc]" list when foo is enabled, and 
> uses the default program list when foo is disabled.

gcc is already the first compiler checked, so your attempt to specify gcc 
merely repeats what is already the default.  (Oh, maybe what you are trying to 
do is give up if gcc is not found?  Or maybe you aren't posting the real 
problem you are having?)

> 
> Is there some way to define a variable argument to AC_PROG_CC to get 
> this functionality?

No, but you can do a followup check that gcc was indeed selected, and bail if 
some other compiler was selected (although, by requiring gcc, your program is 
not as portable; so maybe you should rethink the more fundamental issue of why 
enable_foo seems to require gcc).

And, while we're at it, let's use proper quoting, and take advantage of 
AC_ARG_ENABLE's optional parameters.

AC_INIT
AC_PROG_CC
AC_ARG_ENABLE([foo], [AS_HELP_STRING([--enable-foo], [whatever foo does])],
  [echo "enabled"
   if test "x$CC" != xgcc ; then
     echo "uh-oh - gcc not detected"],
  [echo "disabled"])

-- 
Eric Blake