gmodule – Check for RTLD_LAZY and others in configure

They are no #defines on Android but enum values, and on 64 bit Android
they have different values than what we would otherwise fall-back to.

https://bugzilla.gnome.org/show_bug.cgi?id=776876

configure.ac

@@ -1489,6 +1489,16 @@ dnl *** check whether we need preceeding underscores
   		G_MODULE_NEED_USCORE=0
 	fi
 
+        AC_CHECK_DECL([RTLD_LAZY],
+                      [AC_DEFINE(HAVE_RTLD_LAZY, 1, [Define to 1 if RTLD_LAZY is available])],
+                      [], [[#include <dlfcn.h>]])
+        AC_CHECK_DECL([RTLD_NOW],
+                      [AC_DEFINE(HAVE_RTLD_NOW, 1, [Define to 1 if RTLD_NOW is available])],
+                      [], [[#include <dlfcn.h>]])
+        AC_CHECK_DECL([RTLD_GLOBAL],
+                      [AC_DEFINE(HAVE_RTLD_GLOBAL, 1, [Define to 1 if RTLD_GLOBAL is available])],
+                      [], [[#include <dlfcn.h>]])
+
 	LDFLAGS="$LDFLAGS_orig"
 dnl *** check for having dlerror()
 	AC_CHECK_FUNC(dlerror,

gmodule/gmodule-dl.c

@@ -57,17 +57,18 @@
  * RTLD_GLOBAL - the external symbols defined in the library will be made
  *		 available to subsequently loaded libraries.
  */
-#ifndef	RTLD_LAZY
+#ifndef	HAVE_RTLD_LAZY
 #define	RTLD_LAZY	1
 #endif	/* RTLD_LAZY */
-#ifndef	RTLD_NOW
+#ifndef	HAVE_RTLD_NOW
 #define	RTLD_NOW	0
 #endif	/* RTLD_NOW */
 /* some systems (OSF1 V5.0) have broken RTLD_GLOBAL linkage */
 #ifdef G_MODULE_BROKEN_RTLD_GLOBAL
 #undef	RTLD_GLOBAL
+#undef	HAVE_RTLD_GLOBAL
 #endif /* G_MODULE_BROKEN_RTLD_GLOBAL */
-#ifndef	RTLD_GLOBAL
+#ifndef	HAVE_RTLD_GLOBAL
 #define	RTLD_GLOBAL	0
 #endif	/* RTLD_GLOBAL */