Fix -Os getc_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 getc_unlocked.

__getc_unlocked already exists; this patch makes it explicitly hidden,
calls it where needed for namespace reasons, adds an inline function
for it when inline functions are used and adds libc_hidden_proto /
libc_hidden_weak for getc_unlocked.

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/getc_u.c (getc_unlocked): Use libc_hidden_weak.
	* include/stdio.h [!_ISOMAC] (__getc_unlocked): Use
	attribute_hidden, and define inline if [__USE_EXTERN_INLINES].
	[!_ISOMAC] (getc_unlocked): Use libc_hidden_proto.
	* misc/getttyent.c (__getttyent): Call __getc_unlocked instead of
	getc_unlocked.
	* time/tzfile.c (__tzfile_read): Likewise.

1 files changed, 6 insertions, 6 deletions

diff --git a/time/tzfile.c b/time/tzfile.c
index 1e59fd5abc..3e39723148 100644
--- a/time/tzfile.c
+++ b/time/tzfile.c
@@ -343,11 +343,11 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
 					      sizeof (x), f) != sizeof (x),
 			    0))
 	goto lose;
-      c = getc_unlocked (f);
+      c = __getc_unlocked (f);
       if (__glibc_unlikely ((unsigned int) c > 1u))
 	goto lose;
       types[i].isdst = c;
-      c = getc_unlocked (f);
+      c = __getc_unlocked (f);
       if (__glibc_unlikely ((size_t) c > chars))
 	/* Bogus index in data file.  */
 	goto lose;
@@ -376,7 +376,7 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
 
   for (i = 0; i < num_isstd; ++i)
     {
-      int c = getc_unlocked (f);
+      int c = __getc_unlocked (f);
       if (__glibc_unlikely (c == EOF))
 	goto lose;
       types[i].isstd = c != 0;
@@ -386,7 +386,7 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
 
   for (i = 0; i < num_isgmt; ++i)
     {
-      int c = getc_unlocked (f);
+      int c = __getc_unlocked (f);
       if (__glibc_unlikely (c == EOF))
 	goto lose;
       types[i].isgmt = c != 0;
@@ -398,7 +398,7 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
   if (sizeof (time_t) == 8 && tzspec != NULL)
     {
       /* Skip over the newline first.  */
-      if (getc_unlocked (f) != '\n'
+      if (__getc_unlocked (f) != '\n'
 	  || (__fread_unlocked (tzspec, 1, tzspec_len - 1, f)
 	      != tzspec_len - 1))
 	tzspec = NULL;
@@ -440,7 +440,7 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
       char *tzstr = malloc (tzspec_len);
       if (tzstr == NULL)
 	goto lose;
-      if (getc_unlocked (f) != '\n'
+      if (__getc_unlocked (f) != '\n'
 	  || (__fread_unlocked (tzstr, 1, tzspec_len - 1, f)
 	      != tzspec_len - 1))
 	{