[configury patch] don't add 'mpfr' to --with-mpfr-dir

[Rainer Orth]

Paul Brook <paul@codesourcery.com> writes:

> > 2005-06-04  Tobias Schl"uter  <tobias.schlueter@physik.uni-muenchen.de>
> >
> > 	* configure.in: Don't add another '/mpfr' to the directory given
> > 	in --with-mpfr-dir.
> > 	* configure: Regenerate.
> 
> Ok.
> 
> This looks like is a copy/paste error from when we assumed a combined gmp+mpfr 
> build.

one could argue the other way round: the /mpfr infix is missing from
gmplibs here.  According to the installation docs

--with-gmp=pathname
--with-mpfr=pathname
--with-gmp-dir=pathname
--with-mpfr-dir=pathname
    If you don't have GMP (the GNU Multiple Precision library) and the MPFR
    Libraries installed in a standard location and you want to build the
    Fortran front-end, you can explicitly specify the directory where they
    are installed (`--with-gmp=gmpinstalldir',
    `--with-mpfr=mpfrinstalldir') or where you built them without
    installing (`--with-gmp-dir=gmpbuilddir',
    `--with-mpfr-dir=gmpbuilddir').

i.e. the arg to --with-mpfr-dir is supposed to be gmpbuilddir.  With this
patch and gmp build with --enable-mpfr, you need to know that mpfr is built
inside an mpfr subdir.  On the other hand, omitting mpfr is correct if you
have a separate build of e.g. mpfr 2.1.1.

However this is resolved, there are more problems in this area: for a VPATH
build of gmp with --enable-mpfr, mpfr.h isn't found because (unlike
libmpfr.a) it lives in the gmp $srcdir, not the build dir.  One can work
around this by adding a symlink in the build dir, but this is all terribly
ugly.  It's probably high time for including a copy of gmp and mpfr in GCC
CVS.

	Rainer

-- 
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Rainer Orth, Faculty of Technology, Bielefeld University