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Re: AC_CHECK_LIB(m, main, LIBM="-lm") broken with C++ [PATCH]
From: |
Bob Friesenhahn |
Subject: |
Re: AC_CHECK_LIB(m, main, LIBM="-lm") broken with C++ [PATCH] |
Date: |
Wed, 5 Feb 2003 21:06:17 -0600 (CST) |
On Wed, 5 Feb 2003, Robert Boehne wrote:
> How about this patch?
The patch looks great to me.
Bob
> The math library is not actually used by anything but the
> test suite in Libtool, so as long as the C standard and
> common practice put "cos" in -lm it's all good.
>
> ChangeLog entry:
>
> 2003-02-05 Robert Boehne <address@hidden>
>
> * libtool.m4 (AC_CHECK_LIBM): Search for a real symbol in
> the math library rather than 'main', it causes problems for
> C++ compilers with certain Auto* tools.
> (AC_LIBLTDL_INSTALLABLE): ditto.
>
> Index: libtool.m4
> ===================================================================
> RCS file: /cvsroot/libtool/libtool/libtool.m4,v
> retrieving revision 1.297
> diff -u -r1.297 libtool.m4
> --- libtool.m4 5 Feb 2003 07:03:55 -0000 1.297
> +++ libtool.m4 6 Feb 2003 02:50:39 -0000
> @@ -2246,10 +2246,10 @@
> ;;
> *-ncr-sysv4.3*)
> AC_CHECK_LIB(mw, _mwvalidcheckl, LIBM="-lmw")
> - AC_CHECK_LIB(m, main, LIBM="$LIBM -lm")
> + AC_CHECK_LIB(m, cos, LIBM="$LIBM -lm")
> ;;
> *)
> - AC_CHECK_LIB(m, main, LIBM="-lm")
> + AC_CHECK_LIB(m, cos, LIBM="-lm")
> ;;
> esac
> ])# AC_CHECK_LIBM
> @@ -2294,7 +2294,7 @@
> # In the future, this macro may have to be called after
> AC_PROG_LIBTOOL.
> AC_DEFUN([AC_LIBLTDL_INSTALLABLE],
> [AC_BEFORE([$0],[AC_LIBTOOL_SETUP])dnl
> - AC_CHECK_LIB(ltdl, main,
> + AC_CHECK_LIB(ltdl, lt_dlinit,
> [test x"$enable_ltdl_install" != xyes && enable_ltdl_install=no],
> [if test x"$enable_ltdl_install" = xno; then
> AC_MSG_WARN([libltdl not installed, but installation disabled])
>
>
> Albert Chin wrote:
> >
> > On Wed, Feb 05, 2003 at 03:00:39PM -0600, Bob Friesenhahn wrote:
> > > I posted a detailed message to address@hidden and
> > > address@hidden but there has been no response at all so I will
> > > post again.
> > >
> > > CVS libtool.m4 contains lines like
> > >
> > > AC_CHECK_LIB(m, main, LIBM="-lm")
> > >
> > > and
> > >
> > > AC_CHECK_LIB(ltdl, main, ... blah
> >
> > Gross!
> >
> > > What is the best path forward?
> >
> > Replace main with a *real* function in one of the libraries.
> >
> > --
> > albert chin (address@hidden)
> >
> > _______________________________________________
> > Libtool mailing list
> > address@hidden
> > http://mail.gnu.org/mailman/listinfo/libtool
>
>
> _______________________________________________
> Libtool-patches mailing list
> address@hidden
> http://mail.gnu.org/mailman/listinfo/libtool-patches
>
======================================
Bob Friesenhahn
address@hidden
http://www.simplesystems.org/users/bfriesen