Fix strftime wcschr namespace (bug 17634)
diff mbox

Message ID alpine.DEB.2.10.1411280043560.15307@digraph.polyomino.org.uk
State New
Headers show

Commit Message

Joseph Myers Nov. 28, 2014, 12:45 a.m. UTC
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).

2014-11-28  Joseph Myers  <joseph@codesourcery.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 (wcschr):
	Rename to __wcschr and define as weak alias of __wcschr.
	* sysdeps/powerpc/powerpc64/multiarch/wcschr.c (wcschr): Likewise.
	* 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.

Comments

Roland McGrath Dec. 9, 2014, 10:57 p.m. UTC | #1
OK by me.

Patch
diff mbox

diff --git a/conform/Makefile b/conform/Makefile
index 4a498e4..5c9bc66 100644
--- a/conform/Makefile
+++ b/conform/Makefile
@@ -325,7 +325,6 @@  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
@@ -334,7 +333,6 @@  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
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..d273d8d 100644
--- a/sysdeps/powerpc/powerpc32/power4/multiarch/wcschr.c
+++ b/sysdeps/powerpc/powerpc32/power4/multiarch/wcschr.c
@@ -25,12 +25,13 @@  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)
 #else
 #undef libc_hidden_def
 #define libc_hidden_def(a)
diff --git a/sysdeps/powerpc/powerpc64/multiarch/wcschr.c b/sysdeps/powerpc/powerpc64/multiarch/wcschr.c
index 6b8cd9c..d273d8d 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/wcschr.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/wcschr.c
@@ -25,12 +25,13 @@  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)
 #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