errno and *_init cleanup

Define a common view of __errno_location, __h_errno_location in common header
and use that everywhere, __uClibc_main.c is no special.
The rule adopted:
for enabled threads we make in libc the __GI_x() variants strong, x() weak
and (should) provide another strong x() in libpthread.
If threads are disabled, even the __GI_x() variants are weak.

_stdio_init,_stdio_term,_locale_init: make all hidden weak in common header

Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

include/netdb.h

@@ -59,6 +59,11 @@ __BEGIN_DECLS
 
 /* Function to get address of global `h_errno' variable.  */
 extern int *__h_errno_location (void) __THROW __attribute__ ((__const__));
+#ifdef _LIBC
+# ifndef __UCLIBC_HAS_THREADS__
+extern int weak_const_function *__h_errno_location(void);
+# endif
+#endif
 libc_hidden_proto(__h_errno_location)
 
 /* Macros for accessing h_errno from inside libc.  */

libc/misc/internals/__errno_location.c

@@ -6,15 +6,8 @@
 
 #include "internal_errno.h"
 
-/* psm: moved to bits/errno.h: */
-int *
-#ifndef __UCLIBC_HAS_THREADS__
-weak_const_function
-#endif
-__errno_location (void)
+int *__errno_location(void)
 {
     return &errno;
 }
-#ifdef IS_IN_libc /* not really need, only to keep in sync w/ libc_hidden_proto */
 libc_hidden_weak(__errno_location)
-#endif

libc/misc/internals/__h_errno_location.c

@@ -6,7 +6,7 @@
 
 #include "internal_errno.h"
 
-int * weak_const_function __h_errno_location (void)
+int *__h_errno_location(void)
 {
     return &h_errno;
 }

libc/misc/internals/__uClibc_main.c

@@ -15,9 +15,6 @@
  */
 
 #include <features.h>
-#ifndef __UCLIBC_HAS_THREADS_NATIVE__
-#define	_ERRNO_H
-#endif
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
@@ -25,13 +22,13 @@
 #include <link.h>
 #include <bits/uClibc_page.h>
 #include <paths.h>
-#include <unistd.h>
-#include <asm/errno.h>
+#include <errno.h>
+#include <netdb.h>
+#include <stdio.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <sys/sysmacros.h>
 #ifdef __UCLIBC_HAS_THREADS_NATIVE__
-#include <errno.h>
 #include <pthread-functions.h>
 #include <not-cancel.h>
 #include <atomic.h>
@@ -39,6 +36,9 @@
 #ifdef __UCLIBC_HAS_THREADS__
 #include <pthread.h>
 #endif 
+#ifdef __UCLIBC_HAS_LOCALE__
+#include <locale.h>
+#endif
 
 #ifndef SHARED
 void *__libc_stack_end = NULL;
@@ -116,12 +116,6 @@ static __always_inline int not_null_ptr(const void *p)
 /*
  * Prototypes.
  */
-extern int *weak_const_function __errno_location(void);
-extern int *weak_const_function __h_errno_location(void);
-extern void weak_function _stdio_init(void) attribute_hidden;
-#ifdef __UCLIBC_HAS_LOCALE__
-extern void weak_function _locale_init(void) attribute_hidden;
-#endif
 #ifdef __UCLIBC_HAS_THREADS__
 #if !defined (__UCLIBC_HAS_THREADS_NATIVE__) || defined (SHARED)
 extern void weak_function __pthread_initialize_minimal(void);

libc/misc/locale/locale.c

@@ -906,7 +906,6 @@ void attribute_hidden _locale_init_l(__locale_t base)
 	_locale_set_l((unsigned char*) C_LOCALE_SELECTOR, base);
 }
 
-void _locale_init(void) attribute_hidden;
 void _locale_init(void)
 {
 	/* TODO: mmap the locale file  */

libc/stdio/_stdio.c

@@ -252,7 +252,7 @@ void _stdio_term(void)
 }
 
 #if defined __STDIO_BUFFERS || !defined __UCLIBC__
-void attribute_hidden _stdio_init(void)
+void _stdio_init(void)
 {
 #ifdef __STDIO_BUFFERS
 	int old_errno = errno;

libc/sysdeps/linux/common/bits/errno.h

@@ -43,6 +43,11 @@
 # ifndef __ASSEMBLER__
 /* Function to get address of global `errno' variable.  */
 extern int *__errno_location (void) __THROW __attribute__ ((__const__));
+#  ifdef _LIBC
+#   ifndef __UCLIBC_HAS_THREADS__
+extern int weak_const_function *__errno_location(void);
+#   endif
+#  endif
 libc_hidden_proto(__errno_location)
 
 #  ifdef __UCLIBC_HAS_THREADS__

libc/sysdeps/linux/common/bits/uClibc_locale.h

@@ -93,7 +93,7 @@ typedef struct __uclibc_locale_struct *__locale_t;
 #ifdef _LIBC
 
 /* extern void _locale_set(const unsigned char *p); */
-/* extern void _locale_init(void); */
+extern void weak_function _locale_init(void) attribute_hidden;
 
 #include <stddef.h>
 #include <stdint.h>

libc/sysdeps/linux/common/bits/uClibc_stdio.h

@@ -327,8 +327,8 @@ struct __STDIO_FILE_STRUCT {
  **********************************************************************/
 #if defined _LIBC && (defined IS_IN_libc || defined NOT_IN_libc)
 
-extern void _stdio_init(void) attribute_hidden;
-extern void _stdio_term(void) attribute_hidden;
+extern void weak_function _stdio_init(void) attribute_hidden;
+extern void weak_function _stdio_term(void) attribute_hidden;
 
 #ifdef __STDIO_HAS_OPENLIST