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[COMMITTED PATCH] NaCl: Call __nacl_main in preference to main.

The norm for NaCl C libraries is to call __nacl_main if it's defined,
rather than main.  This allows for libraries that wrap an application's
original main function.

I've also cherry-picked this onto the 2.22 branch.


2015-08-25  Roland McGrath  <>

	* sysdeps/nacl/start.c (_start): Call __nacl_main instead of main
	if the weak reference is not null.

diff --git a/sysdeps/nacl/start.c b/sysdeps/nacl/start.c
index a4b6dd3..8e8bc1a 100644
--- a/sysdeps/nacl/start.c
+++ b/sysdeps/nacl/start.c
@@ -44,6 +44,10 @@
 /* The application defines this, of course.  */
 extern int main (int argc, char **argv, char **envp);
+/* But maybe it defines this too, in which case it takes precedence.  */
+extern int __nacl_main (int argc, char **argv, char **envp)
+  __attribute__ ((weak));
 /* These are defined in libc.  */
 extern int __libc_csu_init (int argc, char **argv, char **envp);
 extern void __libc_csu_fini (void);
@@ -59,7 +63,7 @@ _start (uint32_t info[])
   /* The generic code actually assumes that envp follows argv.  */
-  __libc_start_main (&main,
+  __libc_start_main (&__nacl_main ?: &main,
 		     nacl_startup_argc (info),
 		     nacl_startup_argv (info),
 		     nacl_startup_auxv (info),

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