From 79176757fc8f514b51726ef4102397eebb7a3ec1 Mon Sep 17 00:00:00 2001
From: Andrew Noyes <andrew@weaselab.dev>
Date: Tue, 30 Jan 2024 10:39:43 -0800
Subject: [PATCH] Test symbol visibility

---
 CMakeLists.txt  | 13 +++++++++++++
 linker.map      |  6 ++++++
 test_symbols.sh |  5 +++++
 3 files changed, 24 insertions(+)
 create mode 100644 linker.map
 create mode 100755 test_symbols.sh

diff --git a/CMakeLists.txt b/CMakeLists.txt
index fad6d30..a712c2c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -52,6 +52,11 @@ target_compile_options(${PROJECT_NAME} PRIVATE -fPIC -fno-exceptions
 target_link_options(${PROJECT_NAME} PRIVATE $<$<NOT:$<CONFIG:Debug>>:
                     -nodefaultlibs -lc>)
 
+if(NOT APPLE)
+  target_link_options(${PROJECT_NAME} PRIVATE
+                      LINKER:--version-script=${CMAKE_SOURCE_DIR}/linker.map)
+endif()
+
 add_library(${PROJECT_NAME}_static STATIC ConflictSet.cpp)
 target_compile_options(conflict_set_static PRIVATE -fno-exceptions
                                                    -fvisibility=hidden)
@@ -125,6 +130,14 @@ set_property(TARGET conflict_set_c_api_test PROPERTY CXX_STANDARD 98)
 set_property(TARGET conflict_set_c_api_test PROPERTY CXX_STANDARD_REQUIRED ON)
 add_test(NAME conflict_set_cxx_api_test COMMAND conflict_set_cxx_api_test)
 
+add_test(NAME conflict_set_shared_symbols
+         COMMAND ${CMAKE_SOURCE_DIR}/test_symbols.sh
+                 $<TARGET_FILE:${PROJECT_NAME}> ${CMAKE_SOURCE_DIR}/symbols.txt)
+add_test(
+  NAME conflict_set_static_symbols
+  COMMAND ${CMAKE_SOURCE_DIR}/test_symbols.sh
+          $<TARGET_FILE:${PROJECT_NAME}_static> ${CMAKE_SOURCE_DIR}/symbols.txt)
+
 # packaging
 
 set(CPACK_PACKAGE_CONTACT andrew@weaselab.dev)
diff --git a/linker.map b/linker.map
new file mode 100644
index 0000000..3691443
--- /dev/null
+++ b/linker.map
@@ -0,0 +1,6 @@
+{
+  global:
+    *ConflictSet*;
+  local:
+    *;
+};
\ No newline at end of file
diff --git a/test_symbols.sh b/test_symbols.sh
new file mode 100755
index 0000000..6217cdf
--- /dev/null
+++ b/test_symbols.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+
+set -euo pipefail
+
+diff -u <(nm $1 | grep " T " | cut -f3 -d " " | sort) $2