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Re: checking twice the same library with AC_CHECK_LIB

From: Eric Blake
Subject: Re: checking twice the same library with AC_CHECK_LIB
Date: Fri, 18 Mar 2011 08:41:19 -0600
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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.  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.

Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library

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