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Re: Further on gcc-3.0 sparc-solaris bootstrap failure


On Jun  6, 2001, Stephen L Moshier <moshier@mediaone.net> wrote:

> The libobjc/configure script in the cvs archive is not the same as
> the one that gets generated during the build.  For some reason make
> insists on running autoconf, which generates a libobjc/configure
> file about 50 Kbytes larger than the one in cvs.  The autoconf on
> this machine is version 2.50, and the generated configure script
> stops here:

>   # We need AC_EXEEXT to keep automake happy in cygnus mode.  However,
>   # at least currently, we never actually build a program, so we never
>   # need to use $(EXEEXT).  Moreover, the test for EXEEXT normally
>   # fails, because we are probably configuring with a cross compiler
>   # which cant create executables.  So we include AC_EXEEXT to keep
>   # automake happy, but we dont execute it, since we dont care about
>   # the result.
>   if false; then

>   fi

The blank line contains AC_EXEEXT in configure.in.  Since AC_EXEEXT is
run by default by default by autoconf 2.50, the duplicate expands to
nothing, which breaks.

For backward compatibility, autoconf's AC_EXEEXT (and any other
duplicate-discarded macro, for that matter) should probably be
expanded to `:', not nothing, so that constructs as above keep on
working.

As for GCC, we should probably add a line containing `:' inside the
conditional, so that it works with autoconf 2.50 even if the problem
is fixed in 2.51.

Stephen, would you please post a patch?

Next time, use contrib/gcc_update, so that you get to test the exact
configure script in the CVS tree, instead of having it rebuilt with
potentially different versions of autoconf.

-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist    *Please* write to mailing lists, not to me


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