Add a test for EGL and GLX returning different function pointers.

This is the case on the nvidia binary driver's GL, or when you've got
a system mixing nvidia binary GL and Mesa EGL.

1 files changed, 10 insertions, 0 deletions

diff --git a/test/dlwrap.h b/test/dlwrap.h
index 7e943e0..39ec9ec 100644
--- a/test/dlwrap.h
+++ b/test/dlwrap.h
@@ -53,5 +53,15 @@ dlwrap_dlopen_libfips(void);
 void *
 dlwrap_real_dlsym(void *handle, const char *symbol);
 
+#define DEFER_TO_GL(library, func, name, args)                          \
+({                                                                      \
+    void *lib = dlwrap_real_dlopen(library, RTLD_LAZY | RTLD_LOCAL);    \
+    typeof(&func) real_func = dlwrap_real_dlsym(lib, name);             \
+    /* gcc extension -- func's return value is the return value of      \
+     * the statement.                                                   \
+     */                                                                 \
+    real_func args;                                                     \
+})
+
 #endif