Re: GCC_NO_EXECUTABLES and Libtool

[Ralf Wildenhues]

Hello Paolo, Peter,

* Peter O'Gorman wrote on Tue, Dec 16, 2008 at 07:15:06AM CET:
> On 13-Dec-08, at 7:45 AM, Ralf Wildenhues wrote:
>>      Add cache variables to link tests.
>>      * libltdl/m4/libtool.m4 (_LT_SYS_DYNAMIC_LINKER)
>>      (_LT_LINKER_SHLIBS): Add cache variables to tests that
>>      require the linker to work.  For shlibpath_overrides_runpath,
>>      this also changes the semantics to let the result from the C
>>      compiler take precedence.
[...]

> I have not had the chance to apply this to test it, but it reads ok to  
> me. Please apply.

* Paolo Bonzini wrote on Sat, Dec 13, 2008 at 07:20:08PM CET:
> Ralf Wildenhues wrote:
> > [ gcc-patches: OK to pull the libtool.m4 bits over to the GCC tree
> >   once they are applied upstream? ]
> 
> Yes.

Thanks to both of you.  Pushed to git Libtool as shown, applied to GCC
trunk as follows.  Patch for src coming up on the binutils list.

Cheers,
Ralf

ChangeLog:
2008-12-18  Ralf Wildenhues  <address@hidden>

        Backport from upstream Libtool:
        * libltdl.m4 (_LT_SYS_DYNAMIC_LINKER)
        (_LT_LINKER_SHLIBS): Add cache variables to tests that
        require the linker to work.  For shlibpath_overrides_runpath,
        this also changes the semantics to let the result from the C
        compiler take precedence.

boehm-gc/ChangeLog:
2008-12-18  Ralf Wildenhues  <address@hidden>

        * configure: Regenerate.

fixincludes/ChangeLog:
2008-12-18  Ralf Wildenhues  <address@hidden>

        * configure: Regenerate.

gcc/ChangeLog:
2008-12-18  Ralf Wildenhues  <address@hidden>

        * configure: Regenerate.

libffi/ChangeLog:
2008-12-18  Ralf Wildenhues  <address@hidden>

        * configure: Regenerate.

libgfortran/ChangeLog:
2008-12-18  Ralf Wildenhues  <address@hidden>

        * configure: Regenerate.

libgomp/ChangeLog:
2008-12-18  Ralf Wildenhues  <address@hidden>

        * configure: Regenerate.

libjava/classpath/ChangeLog:
2008-12-18  Ralf Wildenhues  <address@hidden>

        * configure: Regenerate.

libjava/ChangeLog:
2008-12-18  Ralf Wildenhues  <address@hidden>

        * configure: Regenerate.

libmudflap/ChangeLog:
2008-12-18  Ralf Wildenhues  <address@hidden>

        * configure: Regenerate.

libobjc/ChangeLog:
2008-12-18  Ralf Wildenhues  <address@hidden>

        * configure: Regenerate.

libssp/ChangeLog:
2008-12-18  Ralf Wildenhues  <address@hidden>

        * configure: Regenerate.

libstdc++-v3/ChangeLog:
2008-12-18  Ralf Wildenhues  <address@hidden>

        * configure: Regenerate.

zlib/ChangeLog.gcj:
2008-12-18  Ralf Wildenhues  <address@hidden>

        * configure: Regenerate.

diff --git a/libtool.m4 b/libtool.m4
index 39ba996..66b1a3f 100644
--- a/libtool.m4
+++ b/libtool.m4
@@ -2454,16 +2454,21 @@ linux* | k*bsd*-gnu)
   finish_cmds='PATH="\$PATH:/sbin" ldconfig -n $libdir'
   shlibpath_var=LD_LIBRARY_PATH
   shlibpath_overrides_runpath=no
+
   # Some binutils ld are patched to set DT_RUNPATH
-  save_LDFLAGS=$LDFLAGS
-  save_libdir=$libdir
-  eval "libdir=/foo; wl=\"$_LT_TAGVAR(lt_prog_compiler_wl, $1)\"; \
-       LDFLAGS=\"\$LDFLAGS $_LT_TAGVAR(hardcode_libdir_flag_spec, $1)\""
-  AC_LINK_IFELSE([AC_LANG_PROGRAM([],[])],
-    [AS_IF([ ($OBJDUMP -p conftest$ac_exeext) 2>/dev/null | grep 
"RUNPATH.*$libdir" >/dev/null],
-       [shlibpath_overrides_runpath=yes])])
-  LDFLAGS=$save_LDFLAGS
-  libdir=$save_libdir
+  AC_CACHE_VAL([lt_cv_shlibpath_overrides_runpath],
+    [lt_cv_shlibpath_overrides_runpath=no
+    save_LDFLAGS=$LDFLAGS
+    save_libdir=$libdir
+    eval "libdir=/foo; wl=\"$_LT_TAGVAR(lt_prog_compiler_wl, $1)\"; \
+        LDFLAGS=\"\$LDFLAGS $_LT_TAGVAR(hardcode_libdir_flag_spec, $1)\""
+    AC_LINK_IFELSE([AC_LANG_PROGRAM([],[])],
+      [AS_IF([ ($OBJDUMP -p conftest$ac_exeext) 2>/dev/null | grep 
"RUNPATH.*$libdir" >/dev/null],
+        [lt_cv_shlibpath_overrides_runpath=yes])])
+    LDFLAGS=$save_LDFLAGS
+    libdir=$save_libdir
+    ])
+  shlibpath_overrides_runpath=$lt_cv_shlibpath_overrides_runpath
 
   # This implies no fast_install, which is unacceptable.
   # Some rework will be needed to allow for fast_install
@@ -5111,36 +5116,38 @@ x|xyes)
       # Test whether the compiler implicitly links with -lc since on some
       # systems, -lgcc has to come before -lc. If gcc already passes -lc
       # to ld, don't add -lc before -lgcc.
-      AC_MSG_CHECKING([whether -lc should be explicitly linked in])
-      $RM conftest*
-      echo "$lt_simple_compile_test_code" > conftest.$ac_ext
-
-      if AC_TRY_EVAL(ac_compile) 2>conftest.err; then
-        soname=conftest
-        lib=conftest
-        libobjs=conftest.$ac_objext
-        deplibs=
-        wl=$_LT_TAGVAR(lt_prog_compiler_wl, $1)
-       pic_flag=$_LT_TAGVAR(lt_prog_compiler_pic, $1)
-        compiler_flags=-v
-        linker_flags=-v
-        verstring=
-        output_objdir=.
-        libname=conftest
-        lt_save_allow_undefined_flag=$_LT_TAGVAR(allow_undefined_flag, $1)
-        _LT_TAGVAR(allow_undefined_flag, $1)=
-        if AC_TRY_EVAL(_LT_TAGVAR(archive_cmds, $1) 2\>\&1 \| $GREP \" -lc \" 
\>/dev/null 2\>\&1)
-        then
-         _LT_TAGVAR(archive_cmds_need_lc, $1)=no
-        else
-         _LT_TAGVAR(archive_cmds_need_lc, $1)=yes
-        fi
-        _LT_TAGVAR(allow_undefined_flag, $1)=$lt_save_allow_undefined_flag
-      else
-        cat conftest.err 1>&5
-      fi
-      $RM conftest*
-      AC_MSG_RESULT([$_LT_TAGVAR(archive_cmds_need_lc, $1)])
+      AC_CACHE_CHECK([whether -lc should be explicitly linked in],
+       [lt_cv_]_LT_TAGVAR(archive_cmds_need_lc, $1),
+       [$RM conftest*
+       echo "$lt_simple_compile_test_code" > conftest.$ac_ext
+
+       if AC_TRY_EVAL(ac_compile) 2>conftest.err; then
+         soname=conftest
+         lib=conftest
+         libobjs=conftest.$ac_objext
+         deplibs=
+         wl=$_LT_TAGVAR(lt_prog_compiler_wl, $1)
+         pic_flag=$_LT_TAGVAR(lt_prog_compiler_pic, $1)
+         compiler_flags=-v
+         linker_flags=-v
+         verstring=
+         output_objdir=.
+         libname=conftest
+         lt_save_allow_undefined_flag=$_LT_TAGVAR(allow_undefined_flag, $1)
+         _LT_TAGVAR(allow_undefined_flag, $1)=
+         if AC_TRY_EVAL(_LT_TAGVAR(archive_cmds, $1) 2\>\&1 \| $GREP \" -lc \" 
\>/dev/null 2\>\&1)
+         then
+           lt_cv_[]_LT_TAGVAR(archive_cmds_need_lc, $1)=no
+         else
+           lt_cv_[]_LT_TAGVAR(archive_cmds_need_lc, $1)=yes
+         fi
+         _LT_TAGVAR(allow_undefined_flag, $1)=$lt_save_allow_undefined_flag
+       else
+         cat conftest.err 1>&5
+       fi
+       $RM conftest*
+       ])
+      _LT_TAGVAR(archive_cmds_need_lc, 
$1)=$lt_cv_[]_LT_TAGVAR(archive_cmds_need_lc, $1)
       ;;
     esac
   fi