From: H.J. Lu <hjl@gnu.org>
Date: Thu, 20 Jul 2000 02:28:44 +0000 (+0000)
Subject: * ltconfig.in: Check if -lc is necessary for building shared
X-Git-Tag: release-1-3d~151
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7bc0e24c4f2378572c73e7d299db93989a998f1d;p=thirdparty%2Flibtool.git

* ltconfig.in: Check if -lc is necessary for building shared
libary. Set build_libtool_need_lc to indicate it.
* ltmain.in: Add -lc when building shared libary only if
necessary.
---

diff --git a/ChangeLog b/ChangeLog
index ca588c8ac..538b9eb58 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2000-07-18  H.J. Lu  <hjl@gnu.org>
+
+	* ltconfig.in: Check if -lc is necessary for building shared
+	libary. Set build_libtool_need_lc to indicate it.
+	* ltmain.in: Add -lc when building shared libary only if
+	necessary.
+
 2000-07-10  Mo DeJong  <mdejong@redhat.com>
 
 	* libtool.m4 (AC_PROG_NM): Fix macro so that it
diff --git a/ltconfig.in b/ltconfig.in
index 4eee1aaf9..4f51ab7ae 100755
--- a/ltconfig.in
+++ b/ltconfig.in
@@ -2019,6 +2019,51 @@ esac
 
 echo "$ac_t$enable_shared" 1>&6
 
+need_lc=yes
+if test "$enable_shared" = yes && test "$with_gcc" = yes; then
+  case "$archive_cmds" in
+  *'~'*)
+    # FIXME: we may have to deal with multi-command sequences.
+    ;;
+  '$CC '*)
+    # 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.
+    echo $ac_n "checking whether -lc is implicitly linked in... $ac_c" 1>&6
+    if eval "test \"`echo '$''{'ac_cv_archive_cmds_needs_lc'+set}'`\" = set"; then
+      echo $ac_n "(cached) $ac_c" 1>&6
+      need_lc=$ac_cv_archive_cmds_needs_lc
+    else
+      $rm conftest*
+      echo "static int dummy;" > conftest.c
+      if { (eval echo $progname:@LINENO@: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>conftest.err; }; then
+	# Append any warnings to the config.log.
+	cat conftest.err 1>&5
+	soname=conftest
+	lib=conftest
+	libobjs=conftest.o
+	deplibs=
+	linkopts=-v
+	compiler_flags=-v
+	linker_flags=-v
+	verstring=
+	output_objdir=.
+	libname=conftest
+	allow_undefined_flag=
+	if { (eval echo $progname:@LINENO@: \"$archive_cmds\") 1>&5; (eval $archive_cmds) 2>&1 | grep " -lc " 1>&5 ; }; then
+	  need_lc=no
+	fi
+      else
+	cat conftest.err 1>&5
+      fi
+    fi
+    $rm conftest*
+    echo "$ac_t$need_lc" 1>&6
+    ;;
+  esac
+fi
+ac_cv_archive_cmds_needs_lc=$need_lc
+
 # Make sure either enable_shared or enable_static is yes.
 test "$enable_shared" = yes || enable_static=yes
 
@@ -2628,6 +2673,9 @@ SHELL=$LTSHELL
 # Whether or not to build shared libraries.
 build_libtool_libs=$enable_shared
 
+# Whether or not to add -lc for building shared libraries.
+build_libtool_need_lc=$need_lc
+
 # Whether or not to build static libraries.
 build_old_libs=$enable_static
 
diff --git a/ltmain.in b/ltmain.in
index 17686090f..14fea5518 100644
--- a/ltmain.in
+++ b/ltmain.in
@@ -2384,8 +2384,10 @@ compiler."
 	    # these systems don't actually have a c library (as such)!
 	    ;;
 	  *)
-	    # Add libc to deplibs on all other systems.
-	    deplibs="$deplibs -lc"
+ 	    # Add libc to deplibs on all other systems if necessary.
+ 	    if test $build_libtool_need_lc = "yes"; then
+ 	      deplibs="$deplibs -lc"
+ 	    fi
 	    ;;
 	  esac
 	fi