Fix a bug in which "DllMain" isn't called when using the static version of Epoxy in Windows.

src/CMakeLists.txt

@@ -63,21 +63,28 @@ if (EPOXY_SUPPORT_WGL)
                          "${CMAKE_CURRENT_BINARY_DIR}/../include/epoxy/wgl_generated.h")
 endif ()
 
+set (EPOXY_INCLUDE_DIRS  "../include"
+                         "${CMAKE_CURRENT_BINARY_DIR}/../include"
+                         "${CMAKE_CURRENT_SOURCE_DIR}")
+
 set (TARGET_OBJS_NAME "${TARGET_NAME}_objs")
 add_library ("${TARGET_NAME}_objs" OBJECT ${SOURCES} ${HEADERS})
 set_target_properties ("${TARGET_NAME}_objs" PROPERTIES
                            POSITION_INDEPENDENT_CODE  TRUE)
-target_include_directories ("${TARGET_NAME}_objs" PUBLIC
+target_include_directories ("${TARGET_NAME}_objs" PUBLIC ${EPOXY_INCLUDE_DIRS})
-                                "../include"
-                                "${CMAKE_CURRENT_BINARY_DIR}/../include"
-                                "${CMAKE_CURRENT_SOURCE_DIR}")
 if (CMAKE_C_COMPILER_ID STREQUAL "MSVC")
     target_compile_definitions ("${TARGET_NAME}_objs" PUBLIC "inline=__inline" EPOXY_EXPORTS)
 endif ()
+set (EPOXY_LIBS_FILES $<TARGET_OBJECTS:${TARGET_NAME}_objs>)
+if (WIN32)
+    set (EPOXY_LIBS_EXTRA_FILES dllmain.c)
+else ()
+    set (EPOXY_LIBS_EXTRA_FILES "")
+endif ()
 set (TARGETS_BUILT_NAMES "")
 if (EPOXY_BUILD_SHARED)
     list (APPEND TARGETS_BUILT_NAMES "${TARGET_NAME}_shared")
-    add_library ("${TARGET_NAME}_shared" SHARED $<TARGET_OBJECTS:${TARGET_NAME}_objs>)
+    add_library ("${TARGET_NAME}_shared" SHARED $<TARGET_OBJECTS:${TARGET_NAME}_objs> ${EPOXY_LIBS_EXTRA_FILES})
     if (WIN32 OR ANDROID)
         set_target_properties ("${TARGET_NAME}_shared" PROPERTIES
                                   OUTPUT_NAME "${TARGET_OUTPUT_NAME}_${TARGET_ABI_VER}")
@@ -90,10 +97,12 @@ if (EPOXY_BUILD_SHARED)
                                   VERSION    "${TARGET_VER}"
                                   SOVERSION  "${TARGET_ABI_VER}")
     endif ()
-endif()
+    target_include_directories ("${TARGET_NAME}_shared" PUBLIC ${EPOXY_INCLUDE_DIRS})
+    target_compile_definitions ("${TARGET_NAME}_shared" PUBLIC EPOXY_EXPORTS EPOXY_BUILDING_SHARED_LIB)
+endif ()
 if (EPOXY_BUILD_STATIC)
     list (APPEND TARGETS_BUILT_NAMES "${TARGET_NAME}_static")
-    add_library ("${TARGET_NAME}_static" STATIC $<TARGET_OBJECTS:${TARGET_NAME}_objs>)
+    add_library ("${TARGET_NAME}_static" STATIC $<TARGET_OBJECTS:${TARGET_NAME}_objs> ${EPOXY_LIBS_EXTRA_FILES})
     if (WIN32)
         set_target_properties ("${TARGET_NAME}_static" PROPERTIES
                                   OUTPUT_NAME "${TARGET_OUTPUT_NAME}_static_${TARGET_ABI_VER}")
@@ -101,7 +110,9 @@ if (EPOXY_BUILD_STATIC)
         set_target_properties ("${TARGET_NAME}_static" PROPERTIES
                                   OUTPUT_NAME "${TARGET_OUTPUT_NAME}_${TARGET_ABI_VER}")
     endif ()
-endif()
+    target_include_directories ("${TARGET_NAME}_static" PUBLIC ${EPOXY_INCLUDE_DIRS})
+    target_compile_definitions ("${TARGET_NAME}_static" PUBLIC EPOXY_EXPORTS EPOXY_BUILDING_STATIC_LIB)
+endif ()
 install (FILES ${HEADERS} DESTINATION "include/epoxy")
 install (TARGETS ${TARGETS_BUILT_NAMES}
            RUNTIME DESTINATION bin

src/dispatch_common.h

@@ -166,4 +166,8 @@ extern BOOL UNWRAPPED_PROTO(wglMakeCurrent_unwrapped)(HDC hdc, HGLRC hglrc);
 extern BOOL UNWRAPPED_PROTO(wglMakeContextCurrentARB_unwrapped)(HDC hDrawDC, HDC hReadDC, HGLRC hglrc);
 extern BOOL UNWRAPPED_PROTO(wglMakeContextCurrentEXT_unwrapped)(HDC hDrawDC, HDC hReadDC, HGLRC hglrc);
 extern BOOL UNWRAPPED_PROTO(wglMakeAssociatedContextCurrentAMD_unwrapped)(HGLRC hglrc);
-#endif /* _WIN32_ */
+#endif /* _WIN32 */
+
+#if EPOXY_SUPPORT_WGL
+extern bool epoxy_first_context_current;
+#endif

src/dispatch_wgl.c

@@ -27,7 +27,7 @@
 
 #include "dispatch_common.h"
 
-static bool first_context_current = false;
+bool epoxy_first_context_current = false;
 static bool already_switched_to_dispatch_table = false;
 
 /**
@@ -75,8 +75,8 @@ epoxy_has_wgl_extension(HDC hdc, const char *ext)
 EPOXY_IMPORTEXPORT void
 epoxy_handle_external_wglMakeCurrent(void)
 {
-    if (!first_context_current) {
+    if (!epoxy_first_context_current) {
-        first_context_current = true;
+        epoxy_first_context_current = true;
     } else {
         if (!already_switched_to_dispatch_table) {
             already_switched_to_dispatch_table = true;
@@ -89,58 +89,6 @@ epoxy_handle_external_wglMakeCurrent(void)
     }
 }
 
-/**
- * This global symbol is apparently looked up by Windows when loading
- * a DLL, but it doesn't declare the prototype.
- */
-BOOL WINAPI
-DllMain(HINSTANCE dll, DWORD reason, LPVOID reserved);
-
-BOOL WINAPI
-DllMain(HINSTANCE dll, DWORD reason, LPVOID reserved)
-{
-    void *data;
-
-    switch (reason) {
-    case DLL_PROCESS_ATTACH:
-        gl_tls_index = TlsAlloc();
-        if (gl_tls_index == TLS_OUT_OF_INDEXES)
-            return FALSE;
-        wgl_tls_index = TlsAlloc();
-        if (wgl_tls_index == TLS_OUT_OF_INDEXES)
-            return FALSE;
-
-        first_context_current = false;
-
-        /* FALLTHROUGH */
-
-    case DLL_THREAD_ATTACH:
-        data = LocalAlloc(LPTR, gl_tls_size);
-        TlsSetValue(gl_tls_index, data);
-
-        data = LocalAlloc(LPTR, wgl_tls_size);
-        TlsSetValue(wgl_tls_index, data);
-
-        break;
-
-    case DLL_THREAD_DETACH:
-    case DLL_PROCESS_DETACH:
-        data = TlsGetValue(gl_tls_index);
-        LocalFree(data);
-
-        data = TlsGetValue(wgl_tls_index);
-        LocalFree(data);
-
-        if (reason == DLL_PROCESS_DETACH) {
-            TlsFree(gl_tls_index);
-            TlsFree(wgl_tls_index);
-        }
-        break;
-    }
-
-    return TRUE;
-}
-
 WRAPPER_VISIBILITY (BOOL)
 WRAPPER(epoxy_wglMakeCurrent)(HDC hdc, HGLRC hglrc)
 {

src/dllmain.c

@@ -0,0 +1,101 @@
+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#if !defined _WIN32
+#error This file should only be used in Windows.
+#endif
+ 
+#include "dispatch_common.h"
+
+/**
+ * This global symbol is apparently looked up by Windows when loading
+ * a DLL, but it doesn't declare the prototype.
+ */
+BOOL WINAPI
+DllMain(HINSTANCE dll, DWORD reason, LPVOID reserved);
+
+BOOL WINAPI
+DllMain(HINSTANCE dll, DWORD reason, LPVOID reserved)
+{
+    void *data;
+
+    switch (reason) {
+    case DLL_PROCESS_ATTACH:
+        gl_tls_index = TlsAlloc();
+        if (gl_tls_index == TLS_OUT_OF_INDEXES)
+            return FALSE;
+        wgl_tls_index = TlsAlloc();
+        if (wgl_tls_index == TLS_OUT_OF_INDEXES)
+            return FALSE;
+
+        epoxy_first_context_current = false;
+
+        /* FALLTHROUGH */
+
+    case DLL_THREAD_ATTACH:
+        data = LocalAlloc(LPTR, gl_tls_size);
+        TlsSetValue(gl_tls_index, data);
+
+        data = LocalAlloc(LPTR, wgl_tls_size);
+        TlsSetValue(wgl_tls_index, data);
+
+        break;
+
+    case DLL_THREAD_DETACH:
+    case DLL_PROCESS_DETACH:
+        data = TlsGetValue(gl_tls_index);
+        LocalFree(data);
+
+        data = TlsGetValue(wgl_tls_index);
+        LocalFree(data);
+
+        if (reason == DLL_PROCESS_DETACH) {
+            TlsFree(gl_tls_index);
+            TlsFree(wgl_tls_index);
+        }
+        break;
+    }
+
+    return TRUE;
+}
+
+#ifdef EPOXY_BUILDING_STATIC_LIB
+#ifdef __GNUC__
+	PIMAGE_TLS_CALLBACK dllmain_callback __attribute__((section(".CRT$XLB"))) = (PIMAGE_TLS_CALLBACK)DllMain;
+#else
+#	ifdef _WIN64
+#		pragma comment(linker, "/INCLUDE:_tls_used")
+#		pragma comment(linker, "/INCLUDE:dllmain_callback")
+#		pragma const_seg(".CRT$XLB")
+		extern const PIMAGE_TLS_CALLBACK dllmain_callback;
+		const PIMAGE_TLS_CALLBACK dllmain_callback = DllMain;
+#		pragma const_seg()
+#	else
+#		pragma comment(linker, "/INCLUDE:__tls_used")
+#		pragma comment(linker, "/INCLUDE:_dllmain_callback")
+#		pragma data_seg(".CRT$XLB")
+		PIMAGE_TLS_CALLBACK dllmain_callback = DllMain;
+#		pragma data_seg()
+#	endif
+#endif
+#endif