Manuel and I were looking into a problem with applications failing to link

(undefined reference to `main') when the .o file containing main was contained
in an static library(a '.a' ar archive).  It turns out that due to its single
pass nature, GNU ld was failing to pull it into the build.  This sticks a dummy
reference to main() into crt0.o, so that when an application is linked with the
main() function in a static library, we can be sure that main() actually gets
linked in.
 -Erik

2 files changed, 8 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/m68k/crt0.S b/libc/sysdeps/linux/m68k/crt0.S
index 78f3ca8a9..c09146fa5 100644
--- a/libc/sysdeps/linux/m68k/crt0.S
+++ b/libc/sysdeps/linux/m68k/crt0.S
@@ -60,3 +60,10 @@ empty_func:
 	.set atexit,empty_func
 #endif
 
+
+/* Stick in a dummy reference to main(), so that if an application
+ * is linking when the main() function is in a static library (.a)
+ * we can be sure that main() actually gets linked in */
+L_dummy_main_reference:
+	.long	main
+
diff --git a/libc/sysdeps/linux/m68k/crt0.c b/libc/sysdeps/linux/m68k/crt0.c
index 0af108f1e..791b7349b 100644
--- a/libc/sysdeps/linux/m68k/crt0.c
+++ b/libc/sysdeps/linux/m68k/crt0.c
@@ -32,6 +32,7 @@ void _start(unsigned int first_arg)
 	argc = *(stack - 1);
 	argv = (char **) stack;
 	envp = (char **)stack + argc + 1;
+	volatile void (*mainp)(int argc,void *argv,void *envp) = main;
 
 	__uClibc_main(argc, argv, envp);
 }