Re: [PPL-devel] User-visible changes to lib-link.m4 and lib-prefix.m4

[Bruno Haible]

Hi Roberto,

> However, the problem we observe is not in the location of the library.

The problem should go away if, on Linux/x86_64 systems, you use
  --prefix=PREFIX --libdir=PREFIX/lib64
when installing the gmp library or, as a simple measure afterwards, copy
or symlink lib to lib64.

> The problem is that, passing from the version
> distributed with Gettext 0.14.6 to the version distributed with
> Gettext 0.15, the right -Idir flag is not added to CPPFLAGS.

The AC_LIB_LINKFLAGS macro does not augment CPPFLAGS if it does not find
the library. Augmenting CPPFLAGS without setting the LIBGMP, LIBGMPXX
variables accordingly would only cause trouble.

>      AC_DEFUN([AC_CHECK_GMP],
>      [
>      dnl Since libgmp and libgmpxx are usually installed in the same location,
>      dnl let the prefixes default from each other.
>      if test -n "$with_libgmpxx_prefix" && test -z "$with_libgmp_prefix"; then
>        with_libgmp_prefix="$with_libgmpxx_prefix"
>      else
>        if test -n "$with_libgmp_prefix" && test -z "$with_libgmpxx_prefix"; 
> then
>          with_libgmpxx_prefix="$with_libgmp_prefix"
>        fi
>      fi
> 
>      dnl Check how to link with libgmp.
>      AC_LIB_LINKFLAGS([gmp])
> 
>      dnl Check how to link with libgmpxx.
>      AC_LIB_LINKFLAGS([gmpxx], [gmp])

This all OK.

Bruno