Add a failing testcase for the public API of epoxy_has_glx_extension.

test/Makefile.am

@@ -34,9 +34,12 @@ AM_CPPFLAGS = \
 TESTS = \
 	glx_public_api \
 	glx_glxgetprocaddress_nocontext \
+	glx_has_extension_nocontext \
 	headerguards \
 	$()
 
+XFAIL_TESTS = glx_has_extension_nocontext
+
 check_PROGRAMS = $(TESTS)
 
 glx_public_api_LDFLAGS = $(X11_LIBS) $(EPOXY) libglx_common.la
@@ -45,3 +48,6 @@ glx_public_api_DEPENDENCIES = libglx_common.la
 glx_glxgetprocaddress_nocontext_LDFLAGS = $(X11_LIBS) $(EPOXY) libglx_common.la
 glx_glxgetprocaddress_nocontext_DEPENDENCIES = libglx_common.la
 
+glx_has_extension_nocontext_LDFLAGS = $(X11_LIBS) $(EPOXY) libglx_common.la
+glx_has_extension_nocontext_DEPENDENCIES = libglx_common.la
+

test/glx_has_extension_nocontext.c

@@ -0,0 +1,56 @@
+/*
+ * 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.
+ */
+
+/**
+ * @file glx_has_extension_nocontext.c
+ *
+ * Catches a bug in early development where glXGetProcAddress() with
+ * no context bound would fail out in dispatch.
+ */
+
+#include <stdio.h>
+#include <assert.h>
+#include <err.h>
+#include "epoxy/gl.h"
+#include "epoxy/glx.h"
+#include <X11/Xlib.h>
+
+#include "glx_common.h"
+
+static Display *dpy;
+
+int
+main(int argc, char **argv)
+{
+    bool pass = true;
+
+    dpy = get_display_or_skip();
+
+    if (!epoxy_has_glx_extension("GLX_ARB_get_proc_address"))
+        errx(1, "Implementation reported absence of GLX_ARB_get_proc_address");
+
+    if (epoxy_has_glx_extension("GLX_ARB_ham_sandwich"))
+        errx(1, "Implementation reported presence of GLX_ARB_ham_sandwich");
+
+    return pass != true;
+}