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gcc/libcpp/system.h
Christophe Lyon 46d3cfd29d libcpp: Fix ATTR_LIKELY definition PR preprocessor/103355 
Fix the definition of ATTR_LIKELY when __has_cpp_attribute is not
defined, as it is the case with old compilers such as gcc-4.8.5.

	libcpp/:
	PR preprocessor/103355
	* system.h (ATTR_LIKELY): Fix definition.
2021-11-23 16:06:42 +00:00

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/* Get common system includes and various definitions and declarations based
on autoconf macros.
Copyright (C) 1998-2021 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC 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 General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef LIBCPP_SYSTEM_H
#define LIBCPP_SYSTEM_H
/* We must include stdarg.h before stdio.h. */
#include <stdarg.h>
#ifdef HAVE_STDDEF_H
# include <stddef.h>
#endif
#ifdef HAVE_STDINT_H
# include <stdint.h>
#endif
#ifdef HAVE_INTTYPES_H
# include <inttypes.h>
#endif
#include <stdio.h>
#ifdef __cplusplus
#include <new>
#endif
/* Define a generic NULL if one hasn't already been defined. */
#ifndef NULL
#define NULL 0
#endif
/* Use the unlocked open routines from libiberty. */
/* Some of these are #define on some systems, e.g. on AIX to redirect
the names to 64bit capable functions for LARGE_FILES support. These
redefs are pointless here so we can override them. */
#undef fopen
#undef freopen
#define fopen(PATH,MODE) fopen_unlocked(PATH,MODE)
#define fdopen(FILDES,MODE) fdopen_unlocked(FILDES,MODE)
#define freopen(PATH,MODE,STREAM) freopen_unlocked(PATH,MODE,STREAM)
/* The compiler is not a multi-threaded application and therefore we
do not have to use the locking functions. In fact, using the locking
functions can cause the compiler to be significantly slower under
I/O bound conditions (such as -g -O0 on very large source files).
HAVE_DECL_PUTC_UNLOCKED actually indicates whether or not the stdio
code is multi-thread safe by default. If it is set to 0, then do
not worry about using the _unlocked functions.
fputs_unlocked, fwrite_unlocked, and fprintf_unlocked are
extensions and need to be prototyped by hand (since we do not
define _GNU_SOURCE). */
#if defined HAVE_DECL_PUTC_UNLOCKED && HAVE_DECL_PUTC_UNLOCKED
# ifdef HAVE_PUTC_UNLOCKED
# undef putc
# define putc(C, Stream) putc_unlocked (C, Stream)
# endif
# ifdef HAVE_PUTCHAR_UNLOCKED
# undef putchar
# define putchar(C) putchar_unlocked (C)
# endif
# ifdef HAVE_GETC_UNLOCKED
# undef getc
# define getc(Stream) getc_unlocked (Stream)
# endif
# ifdef HAVE_GETCHAR_UNLOCKED
# undef getchar
# define getchar() getchar_unlocked ()
# endif
# ifdef HAVE_FPUTC_UNLOCKED
# undef fputc
# define fputc(C, Stream) fputc_unlocked (C, Stream)
# endif
#ifdef __cplusplus
extern "C" {
#endif
# ifdef HAVE_CLEARERR_UNLOCKED
# undef clearerr
# define clearerr(Stream) clearerr_unlocked (Stream)
# if defined (HAVE_DECL_CLEARERR_UNLOCKED) && !HAVE_DECL_CLEARERR_UNLOCKED
extern void clearerr_unlocked (FILE *);
# endif
# endif
# ifdef HAVE_FEOF_UNLOCKED
# undef feof
# define feof(Stream) feof_unlocked (Stream)
# if defined (HAVE_DECL_FEOF_UNLOCKED) && !HAVE_DECL_FEOF_UNLOCKED
extern int feof_unlocked (FILE *);
# endif
# endif
# ifdef HAVE_FILENO_UNLOCKED
# undef fileno
# define fileno(Stream) fileno_unlocked (Stream)
# if defined (HAVE_DECL_FILENO_UNLOCKED) && !HAVE_DECL_FILENO_UNLOCKED
extern int fileno_unlocked (FILE *);
# endif
# endif
# ifdef HAVE_FFLUSH_UNLOCKED
# undef fflush
# define fflush(Stream) fflush_unlocked (Stream)
# if defined (HAVE_DECL_FFLUSH_UNLOCKED) && !HAVE_DECL_FFLUSH_UNLOCKED
extern int fflush_unlocked (FILE *);
# endif
# endif
# ifdef HAVE_FGETC_UNLOCKED
# undef fgetc
# define fgetc(Stream) fgetc_unlocked (Stream)
# if defined (HAVE_DECL_FGETC_UNLOCKED) && !HAVE_DECL_FGETC_UNLOCKED
extern int fgetc_unlocked (FILE *);
# endif
# endif
# ifdef HAVE_FGETS_UNLOCKED
# undef fgets
# define fgets(S, n, Stream) fgets_unlocked (S, n, Stream)
# if defined (HAVE_DECL_FGETS_UNLOCKED) && !HAVE_DECL_FGETS_UNLOCKED
extern char *fgets_unlocked (char *, int, FILE *);
# endif
# endif
# ifdef HAVE_FPUTS_UNLOCKED
# undef fputs
# define fputs(String, Stream) fputs_unlocked (String, Stream)
# if defined (HAVE_DECL_FPUTS_UNLOCKED) && !HAVE_DECL_FPUTS_UNLOCKED
extern int fputs_unlocked (const char *, FILE *);
# endif
# endif
# ifdef HAVE_FERROR_UNLOCKED
# undef ferror
# define ferror(Stream) ferror_unlocked (Stream)
# if defined (HAVE_DECL_FERROR_UNLOCKED) && !HAVE_DECL_FERROR_UNLOCKED
extern int ferror_unlocked (FILE *);
# endif
# endif
# ifdef HAVE_FREAD_UNLOCKED
# undef fread
# define fread(Ptr, Size, N, Stream) fread_unlocked (Ptr, Size, N, Stream)
# if defined (HAVE_DECL_FREAD_UNLOCKED) && !HAVE_DECL_FREAD_UNLOCKED
extern size_t fread_unlocked (void *, size_t, size_t, FILE *);
# endif
# endif
# ifdef HAVE_FWRITE_UNLOCKED
# undef fwrite
# define fwrite(Ptr, Size, N, Stream) fwrite_unlocked (Ptr, Size, N, Stream)
# if defined (HAVE_DECL_FWRITE_UNLOCKED) && !HAVE_DECL_FWRITE_UNLOCKED
extern size_t fwrite_unlocked (const void *, size_t, size_t, FILE *);
# endif
# endif
# ifdef HAVE_FPRINTF_UNLOCKED
# undef fprintf
/* We can't use a function-like macro here because we don't know if
we have varargs macros. */
# define fprintf fprintf_unlocked
# if defined (HAVE_DECL_FPRINTF_UNLOCKED) && !HAVE_DECL_FPRINTF_UNLOCKED
extern int fprintf_unlocked (FILE *, const char *, ...);
# endif
# endif
#ifdef __cplusplus
}
#endif
#endif
/* ??? Glibc's fwrite/fread_unlocked macros cause
"warning: signed and unsigned type in conditional expression". */
#undef fread_unlocked
#undef fwrite_unlocked
#include <sys/types.h>
#include <errno.h>
#if !defined (errno) && defined (HAVE_DECL_ERRNO) && !HAVE_DECL_ERRNO
extern int errno;
#endif
/* Some of glibc's string inlines cause warnings. Plus we'd rather
rely on (and therefore test) GCC's string builtins. */
#define __NO_STRING_INLINES
#ifdef STRING_WITH_STRINGS
# include <string.h>
# include <strings.h>
#else
# ifdef HAVE_STRING_H
# include <string.h>
# else
# ifdef HAVE_STRINGS_H
# include <strings.h>
# endif
# endif
#endif
#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#if HAVE_LIMITS_H
# include <limits.h>
#endif
/* Infrastructure for defining missing _MAX and _MIN macros. Note that
macros defined with these cannot be used in #if. */
/* The extra casts work around common compiler bugs. */
#define INTTYPE_SIGNED(t) (! ((t) 0 < (t) -1))
/* The outer cast is needed to work around a bug in Cray C 5.0.3.0.
It is necessary at least when t == time_t. */
#define INTTYPE_MINIMUM(t) ((t) (INTTYPE_SIGNED (t) \
? (t) 1 << (sizeof (t) * CHAR_BIT - 1) : (t) 0))
#define INTTYPE_MAXIMUM(t) ((t) (~ (t) 0 - INTTYPE_MINIMUM (t)))
/* Use that infrastructure to provide a few constants. */
#ifndef UCHAR_MAX
# define UCHAR_MAX INTTYPE_MAXIMUM (unsigned char)
#endif
#ifdef TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# ifdef HAVE_TIME_H
# include <time.h>
# endif
# endif
#endif
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#else
# ifdef HAVE_SYS_FILE_H
# include <sys/file.h>
# endif
#endif
#ifdef HAVE_LOCALE_H
# include <locale.h>
#endif
#ifdef HAVE_LANGINFO_CODESET
# include <langinfo.h>
#endif
#ifndef HAVE_SETLOCALE
# define setlocale(category, locale) (locale)
#endif
#ifdef ENABLE_NLS
#include <libintl.h>
#else
/* Stubs. */
# undef dgettext
# define dgettext(package, msgid) (msgid)
#endif
#ifndef _
# define _(msgid) dgettext (PACKAGE, msgid)
#endif
#ifndef N_
# define N_(msgid) msgid
#endif
/* Some systems define these in, e.g., param.h. We undefine these names
here to avoid the warnings. We prefer to use our definitions since we
know they are correct. */
#undef MIN
#undef MAX
#define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
#define MAX(X,Y) ((X) > (Y) ? (X) : (Y))
/* The HAVE_DECL_* macros are three-state, undefined, 0 or 1. If they
are defined to 0 then we must provide the relevant declaration
here. These checks will be in the undefined state while configure
is running so be careful to test "defined (HAVE_DECL_*)". */
#ifdef __cplusplus
extern "C" {
#endif
#if defined (HAVE_DECL_ABORT) && !HAVE_DECL_ABORT
extern void abort (void);
#endif
#ifdef __cplusplus
}
#endif
#if HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif
/* Test if something is a normal file. */
#ifndef S_ISREG
#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
#endif
/* Test if something is a directory. */
#ifndef S_ISDIR
#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif
/* Test if something is a character special file. */
#ifndef S_ISCHR
#define S_ISCHR(m) (((m) & S_IFMT) == S_IFCHR)
#endif
/* Test if something is a block special file. */
#ifndef S_ISBLK
#define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK)
#endif
/* Test if something is a socket. */
#ifndef S_ISSOCK
# ifdef S_IFSOCK
# define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK)
# else
# define S_ISSOCK(m) 0
# endif
#endif
/* Test if something is a FIFO. */
#ifndef S_ISFIFO
# ifdef S_IFIFO
# define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)
# else
# define S_ISFIFO(m) 0
# endif
#endif
/* Approximate O_NOCTTY and O_BINARY. */
#ifndef O_NOCTTY
#define O_NOCTTY 0
#endif
#ifndef O_BINARY
# define O_BINARY 0
#endif
/* Filename handling macros. */
#include "filenames.h"
/* Get libiberty declarations. */
#include "libiberty.h"
#include "safe-ctype.h"
/* 1 if we have C99 designated initializers.
??? C99 designated initializers are not supported by most C++
compilers, including G++. -- gdr, 2005-05-18 */
#if !defined(HAVE_DESIGNATED_INITIALIZERS)
#ifdef __cplusplus
#define HAVE_DESIGNATED_INITIALIZERS 0
#else
#define HAVE_DESIGNATED_INITIALIZERS \
((GCC_VERSION >= 2007) || (__STDC_VERSION__ >= 199901L))
#endif
#endif
#ifndef offsetof
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *) 0)->MEMBER)
#endif
/* __builtin_expect(A, B) evaluates to A, but notifies the compiler that
the most likely value of A is B. This feature was added at some point
between 2.95 and 3.0. Let's use 3.0 as the lower bound for now. */
#if (GCC_VERSION < 3000)
#define __builtin_expect(a, b) (a)
#endif
/* Redefine abort to report an internal error w/o coredump, and
reporting the location of the error in the source file. */
extern void fancy_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
#define abort() fancy_abort (__FILE__, __LINE__, __FUNCTION__)
/* Use gcc_assert(EXPR) to test invariants. */
#if ENABLE_ASSERT_CHECKING
#define gcc_assert(EXPR) \
((void)(!(EXPR) ? fancy_abort (__FILE__, __LINE__, __FUNCTION__), 0 : 0))
#elif (GCC_VERSION >= 4005)
#define gcc_assert(EXPR) \
((void)(__builtin_expect (!(EXPR), 0) ? __builtin_unreachable (), 0 : 0))
#else
/* Include EXPR, so that unused variable warnings do not occur. */
#define gcc_assert(EXPR) ((void)(0 && (EXPR)))
#endif
#if CHECKING_P
#define gcc_checking_assert(EXPR) gcc_assert (EXPR)
#else
/* N.B.: in release build EXPR is not evaluated. */
#define gcc_checking_assert(EXPR) ((void)(0 && (EXPR)))
#endif
#ifdef __has_cpp_attribute
# if __has_cpp_attribute(likely)
# define ATTR_LIKELY [[likely]]
# elif __has_cpp_attribute(__likely__)
# define ATTR_LIKELY [[__likely__]]
# else
# define ATTR_LIKELY
# endif
#else
# define ATTR_LIKELY
#endif
/* Poison identifiers we do not want to use. */
#if (GCC_VERSION >= 3000)
#undef calloc
#undef strdup
#undef malloc
#undef realloc
#pragma GCC poison calloc strdup
#pragma GCC poison malloc realloc
/* Libiberty macros that are no longer used in GCC. */
#undef ANSI_PROTOTYPES
#undef PTR_CONST
#undef LONG_DOUBLE
#undef VPARAMS
#undef VA_OPEN
#undef VA_FIXEDARG
#undef VA_CLOSE
#undef VA_START
#pragma GCC poison ANSI_PROTOTYPES PTR_CONST LONG_DOUBLE VPARAMS VA_OPEN \
VA_FIXEDARG VA_CLOSE VA_START
/* Note: not all uses of the `index' token (e.g. variable names and
structure members) have been eliminated. */
#undef bcopy
#undef bzero
#undef bcmp
#undef rindex
#pragma GCC poison bcopy bzero bcmp rindex
#endif /* GCC >= 3.0 */
#endif /* ! LIBCPP_SYSTEM_H */
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