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* [glibc/google/grte/v5-2.27/master] Fix -Os putc_unlocked, fputc_unlocked linknamespace, localplt issues (bug 15105, bug 19463).
@ 2021-11-15 22:40 Fangrui Song
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From: Fangrui Song @ 2021-11-15 22:40 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2641081f12b77defb12ecf65f528610aad6318fd
commit 2641081f12b77defb12ecf65f528610aad6318fd
Author: Joseph Myers <joseph@codesourcery.com>
Date: Wed Feb 21 18:02:24 2018 +0000
Fix -Os putc_unlocked, fputc_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 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.
(cherry picked from commit 039c721a30392790be50dba53b4c72dbcd65be67)
Diff:
---
include/stdio.h | 9 +++++++++
libio/fputc_u.c | 1 +
libio/putc_u.c | 4 +++-
misc/syslog.c | 4 ++--
4 files changed, 15 insertions(+), 3 deletions(-)
diff --git a/include/stdio.h b/include/stdio.h
index 6ad5794baa..c0cb776690 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -183,6 +183,9 @@ 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. */
@@ -221,6 +224,12 @@ __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 */
diff --git a/libio/fputc_u.c b/libio/fputc_u.c
index abe07f33d3..25e2035cf4 100644
--- a/libio/fputc_u.c
+++ b/libio/fputc_u.c
@@ -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)
diff --git a/libio/putc_u.c b/libio/putc_u.c
index 61ca95beda..2d122a6d23 100644
--- a/libio/putc_u.c
+++ b/libio/putc_u.c
@@ -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)
diff --git a/misc/syslog.c b/misc/syslog.c
index 2b6bd373bc..644dbe80ec 100644
--- a/misc/syslog.c
+++ b/misc/syslog.c
@@ -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. */
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2021-11-15 22:40 [glibc/google/grte/v5-2.27/master] Fix -Os putc_unlocked, fputc_unlocked linknamespace, localplt issues (bug 15105, bug 19463) Fangrui Song
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