Fix -Os ferror_unlocked linknamespace, localplt issues (bug 15105, bug 19463).

Continuing the fixes for linknamespace and localplt test failures with
-Os that arise from functions not being inlined in that case, this
patch fixes such failures for ferror_unlocked.

The usual approach is followed of adding __ferror_unlocked (inlined
when ferror_unlocked is), making calls use it when required for
namespace reasons (only one such call), and using libc_hidden_proto /
libc_hidden_weak for the ferror_unlocked weak alias when only localplt
but not namespace issues are involved.

Tested for x86_64 (both without -Os to make sure that case continues
to work, and with -Os to make sure all the relevant linknamespace and
localplt test failures are resolved).  Because of other such failures
that remain after this patch, neither of the bugs can yet be closed.

	[BZ #15105]
	[BZ #19463]
	* libio/ferror_u.c (ferror_unlocked): Rename to __ferror_unlocked
	and define as weak alias of __ferror_unlocked.  Use
	libc_hidden_weak.
	* include/stdio.h [!_ISOMAC] (ferror_unlocked): Use
	libc_hidden_proto.
	[!_ISOMAC] (__ferror_unlocked) New declaration, and inline
	function if [__USE_EXTERN_INLINES].
	* time/getdate.c (__getdate_r): Call __ferror_unlocked instead of
	ferror_unlocked.

1 files changed, 8 insertions, 0 deletions

diff --git a/include/stdio.h b/include/stdio.h
index 7871000071..1bf49a92b5 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -185,6 +185,8 @@ extern __typeof (fputs_unlocked) __fputs_unlocked;
 libc_hidden_proto (__fputs_unlocked)
 libc_hidden_proto (feof_unlocked)
 extern __typeof (feof_unlocked) __feof_unlocked attribute_hidden;
+libc_hidden_proto (ferror_unlocked)
+extern __typeof (ferror_unlocked) __ferror_unlocked attribute_hidden;
 libc_hidden_proto (fmemopen)
 /* The prototype needs repeating instead of using __typeof to use
    __THROW in C++ tests.  */
@@ -211,6 +213,12 @@ __NTH (__feof_unlocked (FILE *__stream))
 {
   return __feof_unlocked_body (__stream);
 }
+
+__extern_inline int
+__NTH (__ferror_unlocked (FILE *__stream))
+{
+  return __ferror_unlocked_body (__stream);
+}
 #  endif
 
 # endif /* not _ISOMAC */