app: support C compiler that defaults to -fno-common
For the Android NDK, between r21 and r22 the NDK compiler switched the
default from "-fcommon" to "-fno-common", which causes duplicate
definitions when building the examples given the current C code. To
fix things, rework the C code to insure that we have a single
definition and an "extern" reference to the objects in question.
Updates golang/go#44121.
Change-Id: If198d5cfd977a7cfd1a37652d3a1916d8c8dbcb7
Reviewed-on: https://go-review.googlesource.com/c/mobile/+/290031
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Trust: Than McIntosh <thanm@google.com>
diff --git a/app/android.go b/app/android.go
index a0c3312..491af51 100644
--- a/app/android.go
+++ b/app/android.go
@@ -35,8 +35,9 @@
#include <pthread.h>
#include <stdlib.h>
-EGLDisplay display;
-EGLSurface surface;
+extern EGLDisplay display;
+extern EGLSurface surface;
+
char* createEGLSurface(ANativeWindow* window);
char* destroyEGLSurface();
