Fix strftime wcschr namespace (bug 17634).

Use of strftime, a C90 function, ends up bringing in wcschr, which is
not a C90 function.  Although not a conformance bug (C90 reserves
wcs*), this is still contrary to glibc practice of avoiding relying on
those reservations; this patch arranges for the internal uses to use
__wcschr instead, with wcschr being a weak alias.  This is more
complicated than some such patches because of the various IFUNC
definitions of wcschr (which include code redefining libc_hidden_def
in a way that involves creating __GI_wcschr manually and so also needs
to create __GI___wcschr after the change of internal uses to use
__wcschr).

Tested for x86_64 and 32-bit x86 (testsuite, and that disassembly of
installed shared libraries is unchanged by the patch).

2014-12-10  Joseph Myers  <joseph@codesourcery.com>
	    Adhemerval Zanella  <azanella@linux.vnet.ibm.com>

	[BZ #17634]
	* wcsmbs/wcschr.c [!WCSCHR] (wcschr): Define as __wcschr.
	Undefine after defining function.  Define as weak alias of
	__wcschr.  Use libc_hidden_weak.
	* include/wchar.h (__wcschr): Declare.  Use libc_hidden_proto.
	* sysdeps/i386/i686/multiarch/wcschr-c.c [IS_IN (libc) && SHARED]
	(libc_hidden_def): Also define __GI___wcschr alias.
	* sysdeps/i386/i686/multiarch/wcschr.S (wcschr): Rename to
	__wcschr and define as weak alias of __wcschr.
	* sysdeps/powerpc/power6/wcschr.c [!WCSCHR] (WCSCHR): Define as
	__wcschr.
	[!WCSCHR] (DEFAULT_WCSCHR): Define.
	[DEFAULT_WCSCHR] (__wcschr): Use libc_hidden_def.
	[DEFAULT_WCSCHR] (wcschr): Define as weak alias of __wcschr.  Use
	libc_hidden_weak.  Do not use libc_hidden_def.
	* sysdeps/powerpc/powerpc32/power4/multiarch/wcschr-ppc32.c
	[IS_IN (libc) && SHARED] (libc_hidden_def): Also define
	__GI___wcschr alias.
	* sysdeps/powerpc/powerpc32/power4/multiarch/wcschr.c
	[IS_IN (libc)] (wcschr): Define as macro expanding to
	__redirect_wcschr.
	[IS_IN (libc)] (__wcschr_ppc): Use __redirect_wcschr in typeof.
	[IS_IN (libc)] (__wcschr_power6): Likewise.
	[IS_IN (libc)] (__wcschr_power7): Likewise.
	[IS_IN (libc)] (__libc_wcschr): New.  Define with libc_ifunc
	instead of wcschr.
	[IS_IN (libc)] (wcschr): Undefine and define as weak alias of
	__libc_wcschr.
	[!IS_IN (libc)] (libc_hidden_def): Do not undefine and redefine.
	* sysdeps/powerpc/powerpc64/multiarch/wcschr.c (wcschr): Rename to
	__wcschr and define as weak alias of __wcschr.  Use
	libc_hidden_builtin_def.
	* sysdeps/x86_64/wcschr.S (wcschr): Rename to __wcschr and define
	as weak alias of __wcschr.  Use libc_hidden_weak.
	* time/alt_digit.c (_nl_get_walt_digit): Use __wcschr instead of
	wcschr.
	* time/era.c (_nl_init_era_entries): Likewise.
	* conform/Makefile (test-xfail-ISO/time.h/linknamespace): Remove
	variable.
	(test-xfail-XPG3/time.h/linknamespace): Likewise.
	(test-xfail-XPG4/time.h/linknamespace): Likewise.

14 files changed, 97 insertions, 23 deletions

diff --git a/ChangeLog b/ChangeLog
index ac8f639..0199461 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,49 @@
 2014-12-10  Joseph Myers  <joseph@codesourcery.com>
+	    Adhemerval Zanella  <azanella@linux.vnet.ibm.com>
+
+	[BZ #17634]
+	* wcsmbs/wcschr.c [!WCSCHR] (wcschr): Define as __wcschr.
+	Undefine after defining function.  Define as weak alias of
+	__wcschr.  Use libc_hidden_weak.
+	* include/wchar.h (__wcschr): Declare.  Use libc_hidden_proto.
+	* sysdeps/i386/i686/multiarch/wcschr-c.c [IS_IN (libc) && SHARED]
+	(libc_hidden_def): Also define __GI___wcschr alias.
+	* sysdeps/i386/i686/multiarch/wcschr.S (wcschr): Rename to
+	__wcschr and define as weak alias of __wcschr.
+	* sysdeps/powerpc/power6/wcschr.c [!WCSCHR] (WCSCHR): Define as
+	__wcschr.
+	[!WCSCHR] (DEFAULT_WCSCHR): Define.
+	[DEFAULT_WCSCHR] (__wcschr): Use libc_hidden_def.
+	[DEFAULT_WCSCHR] (wcschr): Define as weak alias of __wcschr.  Use
+	libc_hidden_weak.  Do not use libc_hidden_def.
+	* sysdeps/powerpc/powerpc32/power4/multiarch/wcschr-ppc32.c
+	[IS_IN (libc) && SHARED] (libc_hidden_def): Also define
+	__GI___wcschr alias.
+	* sysdeps/powerpc/powerpc32/power4/multiarch/wcschr.c
+	[IS_IN (libc)] (wcschr): Define as macro expanding to
+	__redirect_wcschr.
+	[IS_IN (libc)] (__wcschr_ppc): Use __redirect_wcschr in typeof.
+	[IS_IN (libc)] (__wcschr_power6): Likewise.
+	[IS_IN (libc)] (__wcschr_power7): Likewise.
+	[IS_IN (libc)] (__libc_wcschr): New.  Define with libc_ifunc
+	instead of wcschr.
+	[IS_IN (libc)] (wcschr): Undefine and define as weak alias of
+	__libc_wcschr.
+	[!IS_IN (libc)] (libc_hidden_def): Do not undefine and redefine.
+	* sysdeps/powerpc/powerpc64/multiarch/wcschr.c (wcschr): Rename to
+	__wcschr and define as weak alias of __wcschr.  Use
+	libc_hidden_builtin_def.
+	* sysdeps/x86_64/wcschr.S (wcschr): Rename to __wcschr and define
+	as weak alias of __wcschr.  Use libc_hidden_weak.
+	* time/alt_digit.c (_nl_get_walt_digit): Use __wcschr instead of
+	wcschr.
+	* time/era.c (_nl_init_era_entries): Likewise.
+	* conform/Makefile (test-xfail-ISO/time.h/linknamespace): Remove
+	variable.
+	(test-xfail-XPG3/time.h/linknamespace): Likewise.
+	(test-xfail-XPG4/time.h/linknamespace): Likewise.
+
+2014-12-10  Joseph Myers  <joseph@codesourcery.com>
 
 	* libio/tst-ftell-active-handler.c (do_ftruncate_test): Use %ld
 	format for long int variable.
diff --git a/NEWS b/NEWS
index 4235d37..480e3b1 100644
--- a/NEWS
+++ b/NEWS
@@ -13,8 +13,8 @@ Version 2.21
   15884, 16469, 16619, 16740, 16857, 17192, 17266, 17344, 17363, 17370,
   17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
   17570, 17571, 17572, 17573, 17574, 17581, 17582, 17583, 17584, 17585,
-  17589, 17594, 17601, 17608, 17616, 17625, 17633, 17647, 17653, 17664,
-  17665, 17668, 17682.
+  17589, 17594, 17601, 17608, 17616, 17625, 17633, 17634, 17647, 17653,
+  17664, 17665, 17668, 17682.
 
 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
   under certain input conditions resulting in the execution of a shell for
diff --git a/conform/Makefile b/conform/Makefile
index f99c30c..848aae7 100644
--- a/conform/Makefile
+++ b/conform/Makefile
@@ -345,7 +345,6 @@ test-xfail-XOPEN2K/ndbm.h/linknamespace = yes
 test-xfail-XOPEN2K8/ndbm.h/linknamespace = yes
 
 # Unsorted expected failures.
-test-xfail-ISO/time.h/linknamespace = yes
 test-xfail-ISO99/ctype.h/linknamespace = yes
 test-xfail-ISO11/ctype.h/linknamespace = yes
 test-xfail-XPG3/ctype.h/linknamespace = yes
@@ -354,7 +353,6 @@ test-xfail-XPG3/glob.h/linknamespace = yes
 test-xfail-XPG3/regex.h/linknamespace = yes
 test-xfail-XPG3/search.h/linknamespace = yes
 test-xfail-XPG3/stdio.h/linknamespace = yes
-test-xfail-XPG3/time.h/linknamespace = yes
 test-xfail-XPG3/unistd.h/linknamespace = yes
 test-xfail-XPG3/wordexp.h/linknamespace = yes
 test-xfail-XPG4/ctype.h/linknamespace = yes
@@ -370,7 +368,6 @@ test-xfail-XPG4/search.h/linknamespace = yes
 test-xfail-XPG4/stdio.h/linknamespace = yes
 test-xfail-XPG4/stdlib.h/linknamespace = yes
 test-xfail-XPG4/syslog.h/linknamespace = yes
-test-xfail-XPG4/time.h/linknamespace = yes
 test-xfail-XPG4/unistd.h/linknamespace = yes
 test-xfail-XPG4/wordexp.h/linknamespace = yes
 test-xfail-POSIX/aio.h/linknamespace = yes
diff --git a/include/wchar.h b/include/wchar.h
index 8207a53..7b5e1a1 100644
--- a/include/wchar.h
+++ b/include/wchar.h
@@ -85,6 +85,12 @@ libc_hidden_proto (wcscmp)
 libc_hidden_proto (wcsftime)
 libc_hidden_proto (wcsspn)
 libc_hidden_proto (wcschr)
+/* The C++ overloading of wcschr means we have to repeat the type to
+   declare __wcschr instead of using typeof, to avoid errors in C++
+   tests.  */
+extern wchar_t *__wcschr (const wchar_t *__wcs, wchar_t __wc)
+     __THROW __attribute_pure__;
+libc_hidden_proto (__wcschr)
 libc_hidden_proto (wcscoll)
 libc_hidden_proto (wcspbrk)
 
diff --git a/sysdeps/i386/i686/multiarch/wcschr-c.c b/sysdeps/i386/i686/multiarch/wcschr-c.c
index 4c5f0f6..786c132 100644
--- a/sysdeps/i386/i686/multiarch/wcschr-c.c
+++ b/sysdeps/i386/i686/multiarch/wcschr-c.c
@@ -4,7 +4,9 @@
 # ifdef SHARED
 #  undef libc_hidden_def
 #  define libc_hidden_def(name) \
-   __hidden_ver1 (__wcschr_ia32, __GI_wcschr, __wcschr_ia32);
+   __hidden_ver1 (__wcschr_ia32, __GI_wcschr, __wcschr_ia32); \
+   strong_alias (__wcschr_ia32, __wcschr_ia32_1); \
+   __hidden_ver1 (__wcschr_ia32_1, __GI___wcschr, __wcschr_ia32_1);
 # endif
 # define WCSCHR  __wcschr_ia32
 #endif
diff --git a/sysdeps/i386/i686/multiarch/wcschr.S b/sysdeps/i386/i686/multiarch/wcschr.S
index 9a80a33..ccbc058 100644
--- a/sysdeps/i386/i686/multiarch/wcschr.S
+++ b/sysdeps/i386/i686/multiarch/wcschr.S
@@ -23,7 +23,7 @@
 
 #if IS_IN (libc)
 	.text
-ENTRY(wcschr)
+ENTRY(__wcschr)
 	.type	wcschr, @gnu_indirect_function
 	pushl	%ebx
 	cfi_adjust_cfa_offset (4)
@@ -40,5 +40,6 @@ ENTRY(wcschr)
 	cfi_adjust_cfa_offset (-4);
 	cfi_restore (ebx)
 	ret
-END(wcschr)
+END(__wcschr)
+weak_alias (__wcschr, wcschr)
 #endif
diff --git a/sysdeps/powerpc/power6/wcschr.c b/sysdeps/powerpc/power6/wcschr.c
index 7045677..af5dc8c 100644
--- a/sysdeps/powerpc/power6/wcschr.c
+++ b/sysdeps/powerpc/power6/wcschr.c
@@ -19,7 +19,8 @@
 #include <wchar.h>
 
 #ifndef WCSCHR
-# define WCSCHR wcschr
+# define WCSCHR __wcschr
+# define DEFAULT_WCSCHR
 #endif
 
 /* Find the first occurrence of WC in WCS.  */
@@ -86,4 +87,10 @@ WCSCHR (const wchar_t *wcs, const wchar_t wc)
 
   return NULL;
 }
+#ifdef DEFAULT_WCSCHR
+libc_hidden_def (__wcschr)
+weak_alias (__wcschr, wcschr)
+libc_hidden_weak (wcschr)
+#else
 libc_hidden_def (wcschr)
+#endif
diff --git a/sysdeps/powerpc/powerpc32/power4/multiarch/wcschr-ppc32.c b/sysdeps/powerpc/powerpc32/power4/multiarch/wcschr-ppc32.c
index 9a067af..d698efc 100644
--- a/sysdeps/powerpc/powerpc32/power4/multiarch/wcschr-ppc32.c
+++ b/sysdeps/powerpc/powerpc32/power4/multiarch/wcschr-ppc32.c
@@ -21,7 +21,9 @@
 # ifdef SHARED
 #   undef libc_hidden_def
 #   define libc_hidden_def(name)  \
-    __hidden_ver1 (__wcschr_ppc, __GI_wcschr, __wcschr_ppc);
+    __hidden_ver1 (__wcschr_ppc, __GI_wcschr, __wcschr_ppc); \
+    strong_alias (__wcschr_ppc, __wcschr_ppc_1); \
+    __hidden_ver1 (__wcschr_ppc_1, __GI___wcschr, __wcschr_ppc_1);
 # endif
 # define WCSCHR  __wcschr_ppc
 #endif
diff --git a/sysdeps/powerpc/powerpc32/power4/multiarch/wcschr.c b/sysdeps/powerpc/powerpc32/power4/multiarch/wcschr.c
index 6b8cd9c..ae5c517 100644
--- a/sysdeps/powerpc/powerpc32/power4/multiarch/wcschr.c
+++ b/sysdeps/powerpc/powerpc32/power4/multiarch/wcschr.c
@@ -17,22 +17,25 @@
    <http://www.gnu.org/licenses/>.  */
 
 #if IS_IN (libc)
+# define wcschr __redirect_wcschr
 # include <wchar.h>
 # include <shlib-compat.h>
 # include "init-arch.h"
 
-extern __typeof (wcschr) __wcschr_ppc attribute_hidden;
-extern __typeof (wcschr) __wcschr_power6 attribute_hidden;
-extern __typeof (wcschr) __wcschr_power7 attribute_hidden;
+extern __typeof (__redirect_wcschr) __wcschr_ppc attribute_hidden;
+extern __typeof (__redirect_wcschr) __wcschr_power6 attribute_hidden;
+extern __typeof (__redirect_wcschr) __wcschr_power7 attribute_hidden;
 
-libc_ifunc (wcschr,
+extern __typeof (__redirect_wcschr) __libc_wcschr;
+
+libc_ifunc (__libc_wcschr,
 	     (hwcap & PPC_FEATURE_HAS_VSX)
              ? __wcschr_power7 :
 	       (hwcap & PPC_FEATURE_ARCH_2_05)
 	       ? __wcschr_power6
              : __wcschr_ppc);
+#undef wcschr
+weak_alias (__libc_wcschr, wcschr)
 #else
-#undef libc_hidden_def
-#define libc_hidden_def(a)
 #include <wcsmbs/wcschr.c>
 #endif
diff --git a/sysdeps/powerpc/powerpc64/multiarch/wcschr.c b/sysdeps/powerpc/powerpc64/multiarch/wcschr.c
index 6b8cd9c..658cd93 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/wcschr.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/wcschr.c
@@ -25,12 +25,14 @@ extern __typeof (wcschr) __wcschr_ppc attribute_hidden;
 extern __typeof (wcschr) __wcschr_power6 attribute_hidden;
 extern __typeof (wcschr) __wcschr_power7 attribute_hidden;
 
-libc_ifunc (wcschr,
+libc_ifunc (__wcschr,
 	     (hwcap & PPC_FEATURE_HAS_VSX)
              ? __wcschr_power7 :
 	       (hwcap & PPC_FEATURE_ARCH_2_05)
 	       ? __wcschr_power6
              : __wcschr_ppc);
+weak_alias (__wcschr, wcschr)
+libc_hidden_builtin_def (wcschr)
 #else
 #undef libc_hidden_def
 #define libc_hidden_def(a)
diff --git a/sysdeps/x86_64/wcschr.S b/sysdeps/x86_64/wcschr.S
index faca759..5c2f2d4 100644
--- a/sysdeps/x86_64/wcschr.S
+++ b/sysdeps/x86_64/wcschr.S
@@ -20,7 +20,7 @@
 #include <sysdep.h>
 
 	.text
-ENTRY (wcschr)
+ENTRY (__wcschr)
 
 	movd	%rsi, %xmm1
 	pxor	%xmm2, %xmm2
@@ -149,6 +149,8 @@ L(return_null):
 	xor	%rax, %rax
 	ret
 
-END (wcschr)
+END (__wcschr)
 
-libc_hidden_def(wcschr)
+libc_hidden_def(__wcschr)
+weak_alias (__wcschr, wcschr)
+libc_hidden_weak (wcschr)
diff --git a/time/alt_digit.c b/time/alt_digit.c
index bd13abd..36859a9 100644
--- a/time/alt_digit.c
+++ b/time/alt_digit.c
@@ -132,7 +132,7 @@ _nl_get_walt_digit (unsigned int number, struct __locale_data *current)
 		data->walt_digits[cnt] = ptr;
 
 		/* Skip digit format. */
-		ptr = wcschr (ptr, L'\0') + 1;
+		ptr = __wcschr (ptr, L'\0') + 1;
 	      }
 	}
     }
diff --git a/time/era.c b/time/era.c
index fd311c6..5ac75e0 100644
--- a/time/era.c
+++ b/time/era.c
@@ -122,11 +122,11 @@ _nl_init_era_entries (struct __locale_data *current)
 
 		  /* Set and skip wide era name.  */
 		  new_eras[cnt].era_wname = (wchar_t *) ptr;
-		  ptr = (char *) (wcschr ((wchar_t *) ptr, L'\0') + 1);
+		  ptr = (char *) (__wcschr ((wchar_t *) ptr, L'\0') + 1);
 
 		  /* Set and skip wide era format.  */
 		  new_eras[cnt].era_wformat = (wchar_t *) ptr;
-		  ptr = (char *) (wcschr ((wchar_t *) ptr, L'\0') + 1);
+		  ptr = (char *) (__wcschr ((wchar_t *) ptr, L'\0') + 1);
 		}
 	    }
 	}
diff --git a/wcsmbs/wcschr.c b/wcsmbs/wcschr.c
index 1a35b80..bed66a7 100644
--- a/wcsmbs/wcschr.c
+++ b/wcsmbs/wcschr.c
@@ -20,6 +20,8 @@
 /* Find the first occurrence of WC in WCS.  */
 #ifdef WCSCHR
 # define wcschr WCSCHR
+#else
+# define wcschr __wcschr
 #endif
 
 wchar_t *
@@ -35,3 +37,8 @@ wcschr (wcs, wc)
   return NULL;
 }
 libc_hidden_def (wcschr)
+#ifndef WCSCHR
+# undef wcschr
+weak_alias (__wcschr, wcschr)
+libc_hidden_weak (wcschr)
+#endif