fixed the function dlsym casting problem

1 files changed, 8 insertions, 2 deletions

diff --git a/tests/library/test_loader.c b/tests/library/test_loader.c
index b9bce9d..7e5fa28 100644
--- a/tests/library/test_loader.c
+++ b/tests/library/test_loader.c
@@ -26,6 +26,8 @@ int main( void ) {
 	wolf_error_t error;
 	char errbuf[512];
 	typedef int (*multiply_by_two_func)( int );
+	union { multiply_by_two_func func; void *obj; } alias;
+	void *symbol;
 	multiply_by_two_func func;
 	int res = 0;
 
@@ -37,8 +39,12 @@ int main( void ) {
 		return EXIT_FAILURE;
 	}
 
-	/* fetch a known symbol (multiply_by_two) */
-	*(void **)(&func) = wolf_library_get( library, "multiply_by_two", &error );
+	/* fetch a known function symbol (multiply_by_two), for the reasons why naive 
+	 * casting doesn't work, see:
+	 * http://en.wikipedia.org/wiki/Dynamic_loading#cite_note-gcc-strict-aliasing-5 */
+	symbol = wolf_library_get( library, "multiply_by_two", &error );
+	alias.obj = symbol;
+	func = alias.func;
 
 	/* call it */
 	res = func( 2 );