Fwd: libtool--gary--1.0--patch-8

[Gary V . Vaughan]

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In response to this thread:

Alexandre Oliva wrote:
> On Apr  7, 2004, "Gary V. Vaughan" <address@hidden> wrote:
> > Agreed.  Autoconf generates a config.h that encourages #ifdef/#ifndef.
>
> And then it promotes the use of #if.  I recall discussions about this
> in the autoconf list years ago, and there was a conscious decision to
> replace most uses of #ifdef with #if in the documentation, but I can't
> find any wording that explicitly recommends the use of #if over
> #ifdef.  Oh well...

I have had to patch up libltdl so that it doesn't give spurious warnings
when gcc isn't used:

> Tree version:   address@hidden/libtool--devo--1.0
> CVSROOT:        /cvsroot/libtool
> TIMESTAMP:       1.1477 2004/04/13 15:30:10
> Module name:    /cvsroot/libtool/libtool
> Changes by:     address@hidden
>
> Log Message:
>         
>         * libltdl/lt__pre89.h, libltdl/ltdl.c, libltdl/ltdl.h, libltdl/argz.c,
>         libltdl/argz.h, libltdl/lt__glibc.h, libltdl/lt_dlloader.h,
>         libltdl/lt__dirent.c, libltdl/lt__dirent.h, libltdl/lt__private.h,
>         libltdl/lt__alloc.c, libltdl/lt__alloc.h, libltdl/lt_system.h,
>         libltdl/loader-dld_link.c, libltdl/loader-dlopen.c,
>         libltdl/loader-dyld.c,  libltdl/loader-loadlibrary.c,
>         libltdl/loader-shl_load.c, libltdl/lt_error.h, libltdl/lt_mutex.h:
>         Autoconf either defines to 1 or undefs the discovery macros it
>         puts in config.h, and many (non-GNU) compilers throw a spurious
>         warning when testing an #undef macro with #if.  For consistency,
>         while we are touching all these lines, use defined(MACRO) style
>         throughout.
>         Reported by Bob Friesenhahn  <address@hidden>

I figured you might like to document that somewhere in autoconf.texi to
save anyone else from the same mistake.

Cheers,
        Gary.
- --
Gary V. Vaughan      ())_.  address@hidden,gnu.org}
Research Scientist   ( '/   http://tkd.kicks-ass.net
GNU Hacker           / )=   http://www.gnu.org/software/libtool
Technical Author   `(_~)_   http://sources.redhat.com/autobook

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