Use a version script to restrict symbols in the .so

We want to stop aes_* and sha_* functions leaking out of our .so, as well as
internal _olm_* symbols.

This also means we need to link the unit tests against the objects. Possibly we
should distinguish between unit tests and integration tests.

1 files changed, 9 insertions, 0 deletions

diff --git a/version_script.ver b/version_script.ver
new file mode 100644
index 0000000..3aec5f6
--- /dev/null
+++ b/version_script.ver
@@ -0,0 +1,9 @@
+# this is a 'version script' for the linker which tells it to only export
+# symbols starting 'olm_'.
+
+{
+    global:
+        olm_*;
+    local:
+        *;
+};