[PR #3471] Xext/glx: exports symbols to make extension shared

In a987fc7 commit glx library is
statically linked which makes all glx library variables dublicated in
glx.so and glamoregl.so files and leads 'split-brain' problem where same
symbols exist in different depending on context (this evident when it
called using functions with static attribute).

This patch exports neccesary glx symbols for glamor library.

Signed-off-by: Tautvis <gtautvis@gmail.com>
(cherry picked from commit 9b74a3a)
PR: #3471

Author: cepelinas9000

Xext/glx/extension_string.h

@@ -34,6 +34,8 @@
 #ifndef GLX_EXTENSION_STRING_H
 #define GLX_EXTENSION_STRING_H
 
+#include <X11/Xfuncproto.h>
+
 enum {
 /*   GLX_ARB_get_proc_address is implemented on the client. */
     ARB_context_flush_control_bit = 0,
@@ -74,9 +76,16 @@ enum {
 
 #define __GLX_EXT_BYTES ((__NUM_GLX_EXTS + 7) / 8)
 
+/* exported for glamor */
+_X_EXPORT
 extern int __glXGetExtensionString(const unsigned char *enable_bits,
                                    char *buffer);
+/* exported for glamor */
+_X_EXPORT
 extern void __glXEnableExtension(unsigned char *enable_bits, const char *ext);
+
+/* exported for glamor */
+_X_EXPORT
 extern void __glXInitExtensionEnableBits(unsigned char *enable_bits);
 
 #endif                          /* GLX_EXTENSION_STRING_H */

Xext/glx/glxscreens.h

@@ -146,7 +146,10 @@ struct __GLXscreen {
     unsigned char glx_enable_bits[__GLX_EXT_BYTES];
 };
 
-void __glXScreenInit(__GLXscreen * screen, ScreenPtr pScreen);
-void __glXScreenDestroy(__GLXscreen * screen);
+/* exported for glamor */
+_X_EXPORT void __glXScreenInit(__GLXscreen * screen, ScreenPtr pScreen);
+
+/* exported for glamor */
+_X_EXPORT void __glXScreenDestroy(__GLXscreen * screen);
 
 #endif                          /* !__GLX_screens_h__ */

Xext/glx/glxserver.h

@@ -93,7 +93,9 @@ void glxResumeClients(void);
 
 typedef void (*glx_func_ptr)(void);
 typedef glx_func_ptr (*glx_gpa_proc)(const char *);
-void __glXsetGetProcAddress(glx_gpa_proc get_proc_address);
+
+/* exported for glamor */
+_X_EXPORT void __glXsetGetProcAddress(glx_gpa_proc get_proc_address);
 void *__glGetProcAddress(const char *);
 
 void

Xext/glx/glxutil.h

@@ -33,6 +33,8 @@
 
 #include "Xext/glx/glxserver.h"
 
+/* exported for glamor */
+_X_EXPORT
 extern GLboolean __glXDrawableInit(__GLXdrawable * drawable,
                                    __GLXscreen * screen,
                                    DrawablePtr pDraw, int type, XID drawID,

include/glx_extinit.h

@@ -41,6 +41,8 @@ struct __GLXprovider {
 };
 extern __GLXprovider __glXDRISWRastProvider;
 
+/* exported for glamor */
+_X_EXPORT
 void GlxPushProvider(__GLXprovider * provider);
 void xorgGlxCreateVendor(void);