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Subject: bug#20622: libtool 2.4.6: incorrect linking with tcc under GNU/Linux
Resent-From: Vincent Lefevre <vincent@HIDDEN>
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Date: Thu, 21 May 2015 18:41:07 +0200
From: Vincent Lefevre <vincent@HIDDEN>
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I've installed libtool 2.4.6 on my Debian unstable machine in some
non-system directory. When I build GNU MPFR with CC=3Dtcc LD=3Dtcc, I
get things like:

  libtool: link: tcc -O2 -o tzeta_ui tzeta_ui.o  -L../src/.libs ./.libs/l=
ibfrtests.a -lm ../src/.libs/libmpfr.so -lgmp

The problem is that the MPFR library used at run time is not
../src/.libs/libmpfr.so but the one installed on the system.

When I use libtool 2.4.2 with the following patch:

--- a/libltdl/m4/libtool.m4
+++ b/libltdl/m4/libtool.m4
@@ -4375,6 +4375,14 @@
        _LT_TAGVAR(lt_prog_compiler_pic, $1)=3D'-PIC'
        _LT_TAGVAR(lt_prog_compiler_static, $1)=3D'-Bstatic'
        ;;
+      tcc*)
+       # Fabrice Bellard et al's Tiny C Compiler
+       # When it learns to make shared objects, it will
+       # presumably use -fPIC.
+       _LT_TAGVAR(lt_prog_compiler_wl, $1)=3D'-Wl,'
+       _LT_TAGVAR(lt_prog_compiler_pic, $1)=3D'-fPIC'
+       _LT_TAGVAR(lt_prog_compiler_static, $1)=3D'-static'
+       ;;
       pgcc* | pgf77* | pgf90* | pgf95* | pgfortran*)
         # Portland Group compilers (*not* the Pentium gcc compiler,
        # which looks to be a dead project)

I get:

  libtool: link: tcc -O2 -o tzeta_ui tzeta_ui.o  -L../src/.libs ./.libs/l=
ibfrtests.a -lm ../src/.libs/libmpfr.a -lgmp

(libmpfr.a instead of libmpfr.so) and the problem doesn't occur.

So, either libtool should select libmpfr.a as before or it should
make sure that the correct full path to libmpfr.so be used (something
like run path setting?).

--=20
Vincent Lef=E8vre <vincent@HIDDEN> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Vincent Lefevre <vincent@HIDDEN>
Subject: bug#20622: Acknowledgement (libtool 2.4.6: incorrect linking with
 tcc under GNU/Linux)
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References: <20150521164107.GA19980@HIDDEN>
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Date: Thu, 21 May 2015 16:42:02 +0000

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Subject: bug#20622: libtool 2.4.6: incorrect linking with tcc under GNU/Linux
Resent-From: Vincent Lefevre <vincent@HIDDEN>
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Date: Thu, 21 May 2015 18:53:57 +0200
From: Vincent Lefevre <vincent@HIDDEN>
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In libtool.m4,

      tcc*)
        # Fabrice Bellard et al's Tiny C Compiler
        _LT_TAGVAR(ld_shlibs, $1)=yes

if I replace "yes" by "no", libmpfr.a is used and the problem
disappears.

-- 
Vincent Lef�vre <vincent@HIDDEN> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

Message sent to bug-libtool@HIDDEN:

Subject: bug#20622: libtool 2.4.6: incorrect linking with tcc under GNU/Linux
Resent-From: Vincent Lefevre <vincent@HIDDEN>
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Date: Fri, 22 May 2015 11:30:21 +0200
From: Vincent Lefevre <vincent@HIDDEN>
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On 2015-05-21 18:53:57 +0200, Vincent Lefevre wrote:
> In libtool.m4,
> 
>       tcc*)
>         # Fabrice Bellard et al's Tiny C Compiler
>         _LT_TAGVAR(ld_shlibs, $1)=yes
> 
> if I replace "yes" by "no", libmpfr.a is used and the problem
> disappears.

Or better, using a run path like with gcc fixes the problem. I've
just sent a patch to libtool-patches. I'm not quite sure whether
both instances of

  _LT_TAGVAR(hardcode_libdir_flag_spec, $1)='$wl-rpath $wl$libdir'

are necessary (but this seems to be done for other compilers).

-- 
Vincent Lef�vre <vincent@HIDDEN> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

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On 2015-05-22 11:30:21 +0200, Vincent Lefevre wrote:
> Or better, using a run path like with gcc fixes the problem. I've
> just sent a patch to libtool-patches. I'm not quite sure whether
> both instances of
> 
>   _LT_TAGVAR(hardcode_libdir_flag_spec, $1)='$wl-rpath $wl$libdir'
> 
> are necessary (but this seems to be done for other compilers).

Here's the URL of my patch:

https://lists.gnu.org/archive/html/libtool-patches/2015-05/msg00000.html

-- 
Vincent Lef�vre <vincent@HIDDEN> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

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