build: add symbol versioning when we build with gnu ld

There's --enable-symbol-versioning=no to disable it.

metze
(cherry picked from commit cb5492978b6b157f529806afb2f5fc6202888129)
(This used to be commit a739652d94300881479262648592223536fc8eec)

2 files changed, 29 insertions, 8 deletions

diff --git a/source3/script/mksyms.awk b/source3/script/mksyms.awk
index a30bea4d34..dfe51dba7f 100644
--- a/source3/script/mksyms.awk
+++ b/source3/script/mksyms.awk
@@ -9,9 +9,6 @@
 BEGIN {
 	inheader=0;
 	current_file="";
-	print "#"
-	print "# This file is automatically generated with \"make symbols\". DO NOT EDIT "
-	print "#"
 	print "{"
 	print "\tglobal:"
 }
diff --git a/source3/script/mksyms.sh b/source3/script/mksyms.sh
index 51d3fbd999..673c77a3cf 100755
--- a/source3/script/mksyms.sh
+++ b/source3/script/mksyms.sh
@@ -15,26 +15,50 @@ LANG=C; export LANG
 LC_ALL=C; export LC_ALL
 LC_COLLATE=C; export LC_COLLATE
 
-if [ $# -lt 2 ]
+if [ $# -lt 3 ]
 then
-  echo "Usage: $0 awk output_file header_files"
+  echo "Usage: $0 awk versionfile output_file header_files"
   exit 1
 fi
 
 awk="$1"
 shift
 
+versionfile="$1"
+shift
+
 symsfile="$1"
 shift
 symsfile_tmp="$symsfile.$$.tmp~"
 
-proto_src="`echo $@ | tr ' ' '\n' | sort | uniq `"
+libname=`basename $symsfile | cut -d '.' -f1`
+verline=`grep $libname $versionfile`
+majver=`echo -n "$verline" | cut -d ':' -f2`
+minver=`echo -n "$verline" | cut -d ':' -f3`
+upname=`echo -n "$libname" | sed -e 's/^lib//' | tr '[a-z]' '[A-Z]'`
+symver="${upname}_${majver}.${minver}"
 
-echo creating $symsfile
+symsext=`basename $symsfile | cut -d '.' -f2-`
+
+if test x"$symsext" = x"version.syms"; then
+	echo "creating $symsfile for $symver"
+else
+	echo "creating $symsfile"
+	symver="# no symbol versioning"
+fi
+
+proto_src="`echo $@ | tr ' ' '\n' | sort | uniq `"
 
 mkdir -p `dirname $symsfile`
 
-${awk} -f `dirname $0`/mksyms.awk $proto_src > $symsfile_tmp
+cat > $symsfile_tmp <<_ACEOF
+#
+# This file is automatically generated with "$0". DO NOT EDIT
+#
+$symver
+_ACEOF
+
+${awk} -f `dirname $0`/mksyms.awk $proto_src >> $symsfile_tmp
 
 if cmp -s $symsfile $symsfile_tmp 2>/dev/null
 then