Re: tweaks for autoconf 2.50

["Zack Weinberg" <zackw at Stanford dot EDU>]

On Mon, May 28, 2001 at 09:03:36PM -0400, Phil Edwards wrote:
> On Thu, May 24, 2001 at 01:17:19AM -0700, Zack Weinberg wrote:
> > On Thu, May 24, 2001 at 04:39:15AM -0300, Alexandre Oliva wrote:
> > > Huh?  AC_PROG_CC tests the bootstrap compiler in the GCC directory.
> > > The problem occurs when testing the compiler for the target.
> > 
> > Oh, now I get it.
> > 
> > Revised patch tomorrow morning, I need to go sleep now.
> 
> It's been almost four days.  Is that enough sleep?  :-)

Sorry.  I got stuck - being sick didn't help, but the libstdc++
situation is a thorough mess.  Here's where I am now:

- The gcc subdirectory is done.

- libltdl's aclocal.m4 needs a patch to break an expansion cycle
  between two of its macros.

- boehm-gc and libjava need to stop calling AC_CANONICAL_HOST and
  AC_CANONICAL_BUILD when AC_CANONICAL_SYSTEM has already been called.

- libjava has to have one of its macros renamed to avoid an automake
  issue, and needs to use 3 argument AC_DEFINE in one place.

- I've got an AC_NO_EXECUTABLES for 2.13 and a patch for libtool.m4 to
  avoid link tests under AC_NO_EXECUTABLES.

- libobjc can take AC_NO_EXECUTABLES with no further treatment.

- libjava, libiberty, libstdc++-v3, boehm-gc, zlib, libffi all do
  linkage tests which I see no easy way to avoid.

...
>   # Never versions of autoconf add an underscore to these functions.
>   # Prevent future problems ...
>   ifdef([AC_PROG_CC_G],[],[define([AC_PROG_CC_G],defn([_AC_PROG_CC_G]))])
>   ifdef([AC_PROG_CC_GNU],[],[define([AC_PROG_CC_GNU],defn([_AC_PROG_CC_GNU]))])
>   ifdef([AC_PROG_CXX_G],[],[define([AC_PROG_CXX_G],defn([_AC_PROG_CXX_G]))])
>   ifdef([AC_PROG_CXX_GNU],[],[define([AC_PROG_CXX_GNU],defn([_AC_PROG_CXX_GNU]))
> 
> (I thought defn was supposed to define a name; why is it complaining about
> that name being undefined?  Of course it's undefined, that's why we're
> calling defn on it... agh need advil.)

no, that's define().  defn([MACRO]) means "the definition of MACRO",
it's kinda like 'bind' in PostScript.  _AC_PROG_CC_GNU is not
defined, so it complains.

> Applying Zack's initial patch for autoconf 2.50 (by hand to acinclude.m4
> rather than aclocal.m4)

What is the deal with acinclude.m4 and aclocal.m4 exactly?  They are
often almost identical.  I don't know what acinclude.m4 is for.  The
autoconf manual only talks about aclocal.m4.

> I'm assuming yes, since these changes won't go in for 3.0.

I'm actually hoping to get something in for 3.0.

-- 
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