From df40d1dc737a6393eedfc72e3a660daaa6114db3 Mon Sep 17 00:00:00 2001
From: anon <anon [at] nowhere>
Date: Tue, 27 Apr 2021 12:06:42 +0000
Subject: [PATCH] cmake: export all symbols

---
 CMakeLists.txt | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9a932d28e..339609e8c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -234,6 +234,18 @@ add_library(l3 OBJECT incorrect_source.cpp)
 endfunction()
 forbid_undefined_symbols()
 
+if (MINGW)
+  function(export_all_symbols)
+    unset(TMP)
+    add_linker_flag_if_supported(-Wl,--export-all-symbols TMP)
+    string(APPEND CMAKE_SHARED_LINKER_FLAGS ${TMP})
+    string(APPEND CMAKE_MODULE_LINKER_FLAGS ${TMP})
+    set(CMAKE_SHARED_LINKER_FLAGS ${CMAKE_SHARED_LINKER_FLAGS} PARENT_SCOPE)
+    set(CMAKE_MODULE_LINKER_FLAGS ${CMAKE_MODULE_LINKER_FLAGS} PARENT_SCOPE)
+  endfunction()
+  export_all_symbols()
+endif()
+
 if(NOT CMAKE_BUILD_TYPE)
   set(CMAKE_BUILD_TYPE Release CACHE STRING "Build type" FORCE)
   message(STATUS "Setting default build type: ${CMAKE_BUILD_TYPE}")