diff options
| -rw-r--r-- | ChangeLog | 28 | ||||
| -rw-r--r-- | Makefile | 3 | ||||
| -rw-r--r-- | NEWS | 5 | ||||
| -rw-r--r-- | bits/libc-header-start.h | 43 | ||||
| -rw-r--r-- | include/features.h | 17 | ||||
| -rw-r--r-- | libio/stdio.h | 9 | ||||
| -rw-r--r-- | manual/creature.texi | 8 | ||||
| -rw-r--r-- | string/string.h | 8 | ||||
| -rw-r--r-- | wcsmbs/wchar.h | 5 |
9 files changed, 115 insertions, 11 deletions
@@ -1,3 +1,31 @@ +2016-08-02 Joseph Myers <joseph@codesourcery.com> + + * bits/libc-header-start.h: New file. + * Makefile (headers): Add bits/libc-header-start.h. + * include/features.h (__STDC_WANT_LIB_EXT2__): Document. + (__GLIBC_USE): New macro. + * libio/stdio.h: Define + __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION and include + <bits/libc-header-start.h> instead of including <features.h>. + (fmemopen): Declare also if [__GLIBC_USE (LIB_EXT2)]. + (open_memstream): Likewise. + (vasprintf): Declare if [__GLIBC_USE (LIB_EXT2)], not [__USE_GNU]. + (__asprintf): Likewise. + (asprintf): Likewise. + (__getdelim): Declare also if [__GLIBC_USE (LIB_EXT2)]. + (getdelim): Likewise. + (getline): Likewise. + * string/string.h: Define + __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION and include + <bits/libc-header-start.h> instead of including <features.h>. + (strdup): Declare also if [__GLIBC_USE (LIB_EXT2)] + (strndup): Likewise. + * wcsmbs/wchar.h: Define + __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION and include + <bits/libc-header-start.h> instead of including <features.h>. + (open_wmemstream): Declare also if [__GLIBC_USE (LIB_EXT2)]. + * manual/creature.texi (__STDC_WANT_LIB_EXT2__): Document macro. + 2016-08-02 Florian Weimer <fweimer@redhat.com> Support linking against compatibility symbols, for use in tests. @@ -60,7 +60,8 @@ endif # $(AUTOCONF) = no $(addprefix install-, no-libc.a bin lib data headers others) headers := limits.h values.h features.h gnu-versions.h \ - bits/xopen_lim.h gnu/libc-version.h stdc-predef.h + bits/xopen_lim.h gnu/libc-version.h stdc-predef.h \ + bits/libc-header-start.h echo-headers: subdir_echo-headers @@ -7,7 +7,10 @@ using `glibc' in the "product" field. Version 2.25 -[Add important changes here] +* The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR + 24731-2:2010, is supported to enable declarations of functions from that + TR. Note that not all functions from that TR are supported by the GNU C + Library. Security related changes: diff --git a/bits/libc-header-start.h b/bits/libc-header-start.h new file mode 100644 index 0000000000..c6663074a8 --- /dev/null +++ b/bits/libc-header-start.h @@ -0,0 +1,43 @@ +/* Handle feature test macros at the start of a header. + Copyright (C) 2016 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +/* This header is internal to glibc and should not be included outside + of glibc headers. Headers including it must define + __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION first. This header + cannot have multiple include guards because ISO C feature test + macros depend on the definition of the macro when an affected + header is included, not when the first system header is + included. */ + +#ifndef __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION +# error "Never include <bits/libc-header-start.h> directly." +#endif + +#undef __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION + +#include <features.h> + +/* ISO/IEC TR 24731-2:2010 defines the __STDC_WANT_LIB_EXT2__ + macro. */ +#undef __GLIBC_USE_LIB_EXT2 +#if (defined __USE_GNU \ + || (defined __STDC_WANT_LIB_EXT2__ && __STDC_WANT_LIB_EXT2__ > 0)) +# define __GLIBC_USE_LIB_EXT2 1 +#else +# define __GLIBC_USE_LIB_EXT2 0 +#endif diff --git a/include/features.h b/include/features.h index 56d1c571b6..404014115a 100644 --- a/include/features.h +++ b/include/features.h @@ -24,6 +24,7 @@ __STRICT_ANSI__ ISO Standard C. _ISOC99_SOURCE Extensions to ISO C89 from ISO C99. _ISOC11_SOURCE Extensions to ISO C99 from ISO C11. + __STDC_WANT_LIB_EXT2__ Extensions to ISO C99 from TR 27431-2:2010. _POSIX_SOURCE IEEE Std 1003.1. _POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2; if >=199309L, add IEEE Std 1003.1b-1993; @@ -58,6 +59,10 @@ These are defined by this file and are used by the header files to decide what to declare or define: + __GLIBC_USE (F) Define things from feature set F. This is defined + to 1 or 0; the subsequent macros are either defined + or undefined, and those tests should be moved to + __GLIBC_USE. __USE_ISOC11 Define ISO C11 things. __USE_ISOC99 Define ISO C99 things. __USE_ISOC95 Define ISO C90 AMD1 (C95) things. @@ -90,7 +95,14 @@ explicitly undefined if they are not explicitly defined. Feature-test macros that are not defined by the user or compiler but are implied by the other feature-test macros defined (or by the - lack of any definitions) are defined by the file. */ + lack of any definitions) are defined by the file. + + ISO C feature test macros depend on the definition of the macro + when an affected header is included, not when the first system + header is included, and so they are handled in + <bits/libc-header-start.h>, which does not have a multiple include + guard. Feature test macros that can be handled from the first + system header included are handled here. */ /* Undefine everything, so we get a clean slate. */ @@ -139,6 +151,9 @@ # define __GNUC_PREREQ(maj, min) 0 #endif +/* Whether to use feature set F. */ +#define __GLIBC_USE(F) __GLIBC_USE_ ## F + /* _BSD_SOURCE and _SVID_SOURCE are deprecated aliases for _DEFAULT_SOURCE. If _DEFAULT_SOURCE is present we do not issue a warning; the expectation is that the source is being diff --git a/libio/stdio.h b/libio/stdio.h index 4511c3cc69..e37f901e5f 100644 --- a/libio/stdio.h +++ b/libio/stdio.h @@ -24,7 +24,8 @@ #if !defined __need_FILE && !defined __need___FILE # define _STDIO_H 1 -# include <features.h> +# define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION +# include <bits/libc-header-start.h> __BEGIN_DECLS @@ -316,7 +317,7 @@ extern FILE *fopencookie (void *__restrict __magic_cookie, _IO_cookie_io_functions_t __io_funcs) __THROW __wur; #endif -#ifdef __USE_XOPEN2K8 +#if defined __USE_XOPEN2K8 || __GLIBC_USE (LIB_EXT2) /* Create a new stream that refers to a memory buffer. */ extern FILE *fmemopen (void *__s, size_t __len, const char *__modes) __THROW __wur; @@ -395,7 +396,7 @@ extern int vsnprintf (char *__restrict __s, size_t __maxlen, __END_NAMESPACE_C99 #endif -#ifdef __USE_GNU +#if __GLIBC_USE (LIB_EXT2) /* Write formatted output to a string dynamically allocated with `malloc'. Store the address of the string in *PTR. */ extern int vasprintf (char **__restrict __ptr, const char *__restrict __f, @@ -653,7 +654,7 @@ extern char *fgets_unlocked (char *__restrict __s, int __n, #endif -#ifdef __USE_XOPEN2K8 +#if defined __USE_XOPEN2K8 || __GLIBC_USE (LIB_EXT2) /* Read up to (and including) a DELIMITER from STREAM into *LINEPTR (and null-terminate it). *LINEPTR is a pointer returned from malloc (or NULL), pointing to *N characters of space. It is realloc'd as diff --git a/manual/creature.texi b/manual/creature.texi index 3c686165f1..65c5928343 100644 --- a/manual/creature.texi +++ b/manual/creature.texi @@ -166,6 +166,14 @@ macro @code{_ISOC99_SOURCE} should be defined. @end defvr @comment (none) +@comment ISO +@defvr Macro __STDC_WANT_LIB_EXT2__ +If you define this macro to the value @code{1}, features from ISO/IEC +TR 24731-2:2010 (Dynamic Allocation Functions) are enabled. Only some +of the features from this TR are supported by @theglibc{}. +@end defvr + +@comment (none) @comment GNU @defvr Macro _GNU_SOURCE If you define this macro, everything is included: @w{ISO C89}, @w{ISO diff --git a/string/string.h b/string/string.h index c7f8fde7b8..57deaa4191 100644 --- a/string/string.h +++ b/string/string.h @@ -22,7 +22,8 @@ #ifndef _STRING_H #define _STRING_H 1 -#include <features.h> +#define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION +#include <bits/libc-header-start.h> __BEGIN_DECLS @@ -166,7 +167,8 @@ extern size_t strxfrm_l (char *__dest, const char *__src, size_t __n, __locale_t __l) __THROW __nonnull ((2, 4)); #endif -#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 +#if (defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 \ + || __GLIBC_USE (LIB_EXT2)) /* Duplicate S, returning an identical malloc'd string. */ extern char *strdup (const char *__s) __THROW __attribute_malloc__ __nonnull ((1)); @@ -175,7 +177,7 @@ extern char *strdup (const char *__s) /* Return a malloc'd copy of at most N bytes of STRING. The resultant string is terminated even if no null terminator appears before STRING[N]. */ -#if defined __USE_XOPEN2K8 +#if defined __USE_XOPEN2K8 || __GLIBC_USE (LIB_EXT2) extern char *strndup (const char *__string, size_t __n) __THROW __attribute_malloc__ __nonnull ((1)); #endif diff --git a/wcsmbs/wchar.h b/wcsmbs/wchar.h index e4134167dc..9686fcde32 100644 --- a/wcsmbs/wchar.h +++ b/wcsmbs/wchar.h @@ -24,7 +24,8 @@ #if !defined __need_mbstate_t && !defined __need_wint_t # define _WCHAR_H 1 -# include <features.h> +# define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION +# include <bits/libc-header-start.h> #endif #ifdef _WCHAR_H @@ -574,10 +575,12 @@ extern wchar_t *wcpcpy (wchar_t *__restrict __dest, extern wchar_t *wcpncpy (wchar_t *__restrict __dest, const wchar_t *__restrict __src, size_t __n) __THROW; +#endif /* Wide character I/O functions. */ +#if defined __USE_XOPEN2K8 || __GLIBC_USE (LIB_EXT2) /* Like OPEN_MEMSTREAM, but the stream is wide oriented and produces a wide character string. */ extern __FILE *open_wmemstream (wchar_t **__bufloc, size_t *__sizeloc) __THROW; |