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

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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 putc_unlocked and fputc_unlocked.

libc_hidden_* are used for both functions, while namespace issues are
addressed by making putc_unlocked a weak alias of hidden
__putc_unlocked, which is called in the one place where namespace
issues arise (and defined as an inline function in include/stdio.h).

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).  This completes fixing the -Os
linknamespace failures (at least for x86_64); localplt failures remain
after this patch.

2018-02-19  Joseph Myers  <joseph@codesourcery.com>

	[BZ #15105]
	[BZ #19463]
	* libio/fputc_u.c (fputc_unlocked): Use libc_hidden_def.
	* libio/putc_u.c (putc_unlocked): Rename to __putc_unlocked and
	define as weak alias of __putc_unlocked.  Use libc_hidden_weak.
	* include/stdio.h [!_ISOMAC] (fputc_unlocked): Use
	libc_hidden_proto.
	[!_ISOMAC] (putc_unlocked): Likewise.
	[!_ISOMAC] (__putc_unlocked): Declare as hidden function, and
	define inline if [__USE_EXTERN_INLINES].
	* misc/syslog.c (__vsyslog_chk): Call __putc_unlocked instead of
	putc_unlocked.
This commit is contained in:
Joseph Myers 2018-02-21 18:02:24 +00:00
parent 30ac923dbe
commit 039c721a30
5 changed files with 28 additions and 3 deletions
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13
ChangeLog
View File

@ -1,5 +1,18 @@
2018-02-21 Joseph Myers <joseph@codesourcery.com>
[BZ #15105]
[BZ #19463]
* libio/fputc_u.c (fputc_unlocked): Use libc_hidden_def.
* libio/putc_u.c (putc_unlocked): Rename to __putc_unlocked and
define as weak alias of __putc_unlocked. Use libc_hidden_weak.
* include/stdio.h [!_ISOMAC] (fputc_unlocked): Use
libc_hidden_proto.
[!_ISOMAC] (putc_unlocked): Likewise.
[!_ISOMAC] (__putc_unlocked): Declare as hidden function, and
define inline if [__USE_EXTERN_INLINES].
* misc/syslog.c (__vsyslog_chk): Call __putc_unlocked instead of
putc_unlocked.
[BZ #15105]
[BZ #19463]
* libio/getc_u.c (getc_unlocked): Use libc_hidden_weak.

9
include/stdio.h
View File

@ -188,6 +188,9 @@ extern __typeof (feof_unlocked) __feof_unlocked attribute_hidden;
libc_hidden_proto (ferror_unlocked)
extern __typeof (ferror_unlocked) __ferror_unlocked attribute_hidden;
libc_hidden_proto (getc_unlocked)
libc_hidden_proto (fputc_unlocked)
libc_hidden_proto (putc_unlocked)
extern __typeof (putc_unlocked) __putc_unlocked attribute_hidden;
libc_hidden_proto (fmemopen)
/* The prototype needs repeating instead of using __typeof to use
__THROW in C++ tests. */
@ -226,6 +229,12 @@ __getc_unlocked (FILE *__fp)
{
return __getc_unlocked_body (__fp);
}
__extern_inline int
__putc_unlocked (int __c, FILE *__stream)
{
return __putc_unlocked_body (__c, __stream);
}
# endif
# endif /* not _ISOMAC */

1
libio/fputc_u.c
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@ -35,3 +35,4 @@ fputc_unlocked (int c, _IO_FILE *fp)
CHECK_FILE (fp, EOF);
return _IO_putc_unlocked (c, fp);
}
libc_hidden_def (fputc_unlocked)

4
libio/putc_u.c
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@ -21,8 +21,10 @@
#undef putc_unlocked
int
putc_unlocked (int c, _IO_FILE *fp)
__putc_unlocked (int c, _IO_FILE *fp)
{
CHECK_FILE (fp, EOF);
return _IO_putc_unlocked (c, fp);
}
weak_alias (__putc_unlocked, putc_unlocked)
libc_hidden_weak (putc_unlocked)

4
misc/syslog.c
View File

@ -207,8 +207,8 @@ __vsyslog_chk(int pri, int flag, const char *fmt, va_list ap)
fprintf (f, "[%d]", (int) __getpid ());
if (LogTag != NULL)
{
putc_unlocked (':', f);
putc_unlocked (' ', f);
__putc_unlocked (':', f);
__putc_unlocked (' ', f);
}
/* Restore errno for %m format. */