From 5c57848093d4bc4ffc6140365707a879c7a7838c Mon Sep 17 00:00:00 2001
From: eban <eban@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 4 Oct 2002 05:18:05 +0000
Subject: * configure.in (RUBY_PROG_GNU_LD): check whether the linker is GNU
 ld. * ext/extmk.rb (create_makefile): add -Wl,-no-undefined to $DLDFLAGS   on
 Linux if GNU ld is used and --enable-shared is specified.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@2931 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 configure.in | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

(limited to 'configure.in')

diff --git a/configure.in b/configure.in
index 90d2230f6b..b3425ceffd 100644
--- a/configure.in
+++ b/configure.in
@@ -32,6 +32,17 @@ AC_SUBST(CPPOUTFILE)
 rm -f conftest*])
 ])
 
+AC_DEFUN(RUBY_PROG_GNU_LD,
+[AC_CACHE_CHECK(whether the linker is GNU ld, rb_cv_prog_gnu_ld,
+[if `$CC --print-prog-name=ld` -v 2>&1 | grep "GNU ld" > /dev/null; then
+  rb_cv_prog_gnu_ld=yes
+else
+  rb_cv_prog_gnu_ld=no
+fi
+])
+GNU_LD=$rb_cv_prog_gnu_ld
+AC_SUBST(GNU_LD)])
+
 rb_version=`grep RUBY_VERSION $srcdir/version.h`
 MAJOR=`expr "$rb_version" : '#define RUBY_VERSION "\([0-9][0-9]*\)\.[0-9][0-9]*\.[0-9][0-9]*"'`
 MINOR=`expr "$rb_version" : '#define RUBY_VERSION "[0-9][0-9]*\.\([0-9][0-9]*\)\.[0-9][0-9]*"'`
@@ -127,6 +138,7 @@ fi
 AC_PROG_CC
 AC_PROG_GCC_TRADITIONAL
 
+RUBY_PROG_GNU_LD
 RUBY_CPPOUTFILE
 
 OUTFLAG='-o '
@@ -729,7 +741,7 @@ if test "$with_dln_a_out" != yes; then
 			rb_cv_dlopen=yes;;
 	solaris*) 	if test "$GCC" = yes; then
 			   LDSHARED='$(CC) -Wl,-G'
-			   if `$CC --print-prog-name=ld` -v 2>&1 | grep "GNU ld" > /dev/null; then
+			   if test $rb_cv_prog_gnu_ld = yes; then
 	 		       LDFLAGS="-Wl,-E"
 			       LDSHARED="$LDSHARED -shared"
 			   fi
-- 
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