From 1b7973626e27beb05a55df6085f643a1323db987 Mon Sep 17 00:00:00 2001
From: Hubert Chathi <hubertc@matrix.org>
Date: Wed, 16 Jun 2021 15:05:19 -0400
Subject: [PATCH] only export olm functions to avoid colliding with other
 libraries

---
 CMakeLists.txt | 4 ++++
 libolm.version | 4 ++++
 2 files changed, 8 insertions(+)
 create mode 100644 libolm.version

diff --git a/CMakeLists.txt b/CMakeLists.txt
index dbe3b6a..0bd5ec8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -48,6 +48,10 @@ add_library(olm
     lib/curve25519-donna/curve25519-donna.c)
 add_library(Olm::Olm ALIAS olm)
 
+# restrict the exported symbols
+set(CMAKE_SHARED_LINKER_FLAGS ${CMAKE_SHARED_LINKER_FLAGS} -Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/libolm.version)
+set_target_properties(olm PROPERTIES LINK_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/libolm.version)
+
 target_include_directories(olm
     PUBLIC
         $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
diff --git a/libolm.version b/libolm.version
new file mode 100644
index 0000000..f93b6f2
--- /dev/null
+++ b/libolm.version
@@ -0,0 +1,4 @@
+{
+  global: olm*; _olm*; megolm*; _ZN3olm*;
+  local: *;
+};