Bug#519702: libtool: LTDL_INIT causes -ldl to be added to LIBS, thus linking every program with -ldl

[Török Edwin]

Package: libtool
Version: 2.2.6a-1
Severity: minor


When using LTDL_INIT in configure, it causes -ldl to be added to LIBS, thus
later causing all the programs in a package (that uses ltdl) to be linked with 
dl, even if not
all would need it, see below.

I think it would be better if LIBLTDL would contain -ldl, and thus only programs
that actually use ltdl get linked with dl, and not all.

This happens because the LT_DLLOADERS macro uses AC_SEARCH_LIBS that sets LIBS, 
and
LIBS is not saved/restored before/after:
LIBADD_DLOPEN=
AC_SEARCH_LIBS([dlopen], [dl],
...
LT_DLLOADERS="$LT_DLLOADERS ${lt_dlopen_dir+$lt_dlopen_dir/}dlopen.la"])])])
if test x"$libltdl_cv_func_dlopen" = xyes || test x"$libltdl_cv_lib_dl_dlopen" 
= xyes
then
  lt_save_LIBS="$LIBS"
  LIBS="$LIBS $LIBADD_DLOPEN"
  AC_CHECK_FUNCS([dlerror])
  LIBS="$lt_save_LIBS"
fi

Here is a snippet from the output of 'sh -x ./configure':
+ LIBS=
+ printf '%s\n' 'configure:11758: result: -ldl'
+ printf '%s\n' -ldl
+ ac_res=-ldl
+ test -ldl '!=' no
+ test -ldl = 'none required'
+ LIBS='-ldl '
+ cat
+ test -ldl '!=' 'none required'
+ LIBADD_DLOPEN=-ldl
+ libltdl_cv_lib_dl_dlopen=yes
+ LT_DLLOADERS=' dlopen.la'
+ test x = xyes
+ test xyes = xyes
+ lt_save_LIBS='-ldl '

Also configure snippet:
if test "$ac_res" != no; then
  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"

cat >>confdefs.h <<\_ACEOF
#define HAVE_LIBDL 1
_ACEOF

        if test "$ac_cv_search_dlopen" != "none required" ; then
          LIBADD_DLOPEN="-ldl"
        fi
...
if test x"$libltdl_cv_func_dlopen" = xyes || test x"$libltdl_cv_lib_dl_dlopen" 
= xyes
then
  lt_save_LIBS="$LIBS"


-- System Information:
Debian Release: 5.0
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.28.7 (SMP w/4 CPU cores; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages libtool depends on:
ii  autotools-dev                 20080123.2 Update infrastructure for config.{
ii  bcc [c-compiler]              0.16.17-3  16-bit x86 C compiler
ii  cpp                           4:4.3.3-2  The GNU C preprocessor (cpp)
ii  file                          4.26-2     Determines file type using "magic"
ii  gcc [c-compiler]              4:4.3.3-2  The GNU C compiler
ii  gcc-3.4 [c-compiler]          3.4.6-9    The GNU C compiler
ii  gcc-4.1 [c-compiler]          4.1.2-25   The GNU C compiler
ii  gcc-4.2 [c-compiler]          4.2.4-6    The GNU C compiler
ii  gcc-4.3 [c-compiler]          4.3.3-5    The GNU C compiler
ii  libc6-dev [libc-dev]          2.9-4      GNU C Library: Development Librari

Versions of packages libtool recommends:
ii  libltdl7-dev                  2.2.6a-1   A system independent dlopen wrappe

Versions of packages libtool suggests:
ii  autoconf                      2.63-3     automatic configure script builder
ii  automake [automaken]          1:1.10.1-3 A tool for generating GNU Standard
ii  automake1.7 [automaken]       1.7.9-9    A tool for generating GNU Standard
pn  gcj                           <none>     (no description available)
pn  gfortran | fortran95-compiler <none>     (no description available)
pn  libtool-doc                   <none>     (no description available)

-- no debconf information



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