From 8de01a81c73fd663ef17c9216fec162063fe783b Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@samba.org>
Date: Mon, 23 Apr 2012 10:28:35 +0200
Subject: [PATCH] add symbol-versions/

This shows that upgrades from libraries without symbol versions
to libraries with symbol versions seem to work.

(At least on ubuntu 11.04 amd64)

metze
---
 symbol-versions/Makefile | 37 +++++++++++++++++++++++++++++++++++++
 symbol-versions/app.c    |  7 +++++++
 symbol-versions/lib.c    |  6 ++++++
 3 files changed, 50 insertions(+)
 create mode 100644 symbol-versions/Makefile
 create mode 100644 symbol-versions/app.c
 create mode 100644 symbol-versions/lib.c

diff --git a/symbol-versions/Makefile b/symbol-versions/Makefile
new file mode 100644
index 0000000..27c3403
--- /dev/null
+++ b/symbol-versions/Makefile
@@ -0,0 +1,37 @@
+default: all
+
+CFLAGS=-fPIC
+
+clean:
+	rm -rf *.o *.so* without-version/ with-version/ app
+
+without-version:
+	mkdir -p without-version
+
+without-version/vscript: without-version
+	echo "{ global: *; };" > without-version/vscript
+
+without-version/lib.so.0: lib.o without-version/vscript
+	gcc -shared -o without-version/lib.so.0 -Wl,-soname=lib.so.0 -Wl,--version-script=without-version/vscript lib.o
+
+with-version:
+	mkdir -p with-version
+
+with-version/vscript: with-version
+	echo "LIB_0 { global: *; };" > with-version/vscript
+
+with-version/lib.so.0: lib.o with-version/vscript
+	gcc -shared -o with-version/lib.so.0 -Wl,-soname=lib.so.0 -Wl,--version-script=with-version/vscript lib.o
+
+app: app.o without-version/lib.so.0 with-version/lib.so.0
+	gcc -o app app.o without-version/lib.so.0
+
+show: clean app
+	readelf -a without-version/lib.so.0 |grep lib_function
+	LD_LIBRARY_PATH=without-version/ ldd ./app
+	LD_LIBRARY_PATH=without-version/ ./app
+	readelf -a with-version/lib.so.0 |grep lib_function
+	LD_LIBRARY_PATH=with-version/ ldd ./app
+	LD_LIBRARY_PATH=with-version/ ./app
+
+all: show
diff --git a/symbol-versions/app.c b/symbol-versions/app.c
new file mode 100644
index 0000000..d916ea5
--- /dev/null
+++ b/symbol-versions/app.c
@@ -0,0 +1,7 @@
+
+int main(void)
+{
+	lib_function();
+	return 0;
+}
+
diff --git a/symbol-versions/lib.c b/symbol-versions/lib.c
new file mode 100644
index 0000000..397b746
--- /dev/null
+++ b/symbol-versions/lib.c
@@ -0,0 +1,6 @@
+
+void lib_function(void)
+{
+	printf("lib_function\n");
+}
+
-- 
2.34.1