Re: checking twice the same library with AC_CHECK_LIB

[Vincent Torri]

On Fri, 18 Mar 2011, Eric Blake wrote:

> On 03/18/2011 08:29 AM, Vincent Torri wrote:
> > Hey,
> >
> > on Windows, with mingw, libbfd may depend on gettext (libintl, more
> > precisely). I would like to do something like:
> >
> > AC_CHECK_LIB([bfd], [bfd_openr],
> >    [
> >     have_bfd="yes"
> >     bfd_libs="-lbfd"
> >    ],
> >    [have_bfd="no"])
> > if test "x$have_bfd" = "xno" ; then
> >    AC_CHECK_LIB([bfd], [bfd_openr],
> >       [bfd_libs="-lbfd -lintl"],
> >       [AC_MSG_ERROR([the symbol bfd_openr can not be found])],
> >       [-lintl])
> > fi
>
> According to the autoconf manual, you should rearrange the test order,
> and test for libintl first prior to bfd, so that $LIBS will already
> include -lintl by the time you are ready to test for -bfd.

It's not what I want. The test I want is:

1) checking if libbfd can be used without libintl. If yes, then setting 
bfd_libs to "-lbfd"

2) If no, then checking if libbfd can be used with libintl. If yes, then 
setting bfd_libs to "-lbfd -lintl". If not, I exit.

I want to set bfd_libs like that (because of static linking and .pc files)

> Also,
> AC_CHECK_LIB has a fifth argument (other-libraries); you may want to try:
>
> AC_CHECK_LIB([bfd], [bfd_openr], [...], [...], [-lintl])
>
> if you haven't already guaranteed that -lintl is in $LIBS.

that's what I use when the first check fails (see above)

Vincent Torri