Re: unreliable detection of universal builds in AC_C_BIGENDIAN

[Eric Blake]

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According to Bruno Haible on 12/25/2008 6:06 AM:
>       # Check for potential -arch flags.  It is not universal unless
> !     # there are some -arch flags.
> !     ac_prev=
> !     for ac_word in ${CC} ${CFLAGS} ${CPPFLAGS} ${LDFLAGS}; do
> !       if test -n "$ac_prev"; then
> !         case $ac_word in
> !           i386 | x86_64 | ppc | ppc64) ac_cv_c_bigendian=universal ;;
> !         esac
> !         ac_prev=
> !       else
> !         if test "x$ac_word" = "x-arch"; then

Can the argument to -arch be specified with an =, rather than as the next
argument, in which case this doesn't work?

> !           ac_prev=arch
> !         fi
> !       fi
> !     done])

Wouldn't this also do the trick, by narrowing the search to an argument
that starts with -arch, without resorting to an iteration over arguments?

case " $CC $CFLAGS $CPPFLAGS $LDFLAGS" in  #(
  *\ -arch*ppc* | *\ -arch*i386* | *\ -arch*x86_64*)
    ac_cv_c_bigendian=universal;;
esac

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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