mirror of
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78669517dc
This incorporates: 2019-09-22 Update some URLs 2019-09-15 fcntl-h: fix compilation error of creat.c on MSVC 2019-09-15 creat: new module 2019-09-15 access: new module 2019-09-09 Add option to assume best, not worst, when cross-compiling. * build-aux/config.guess, build-aux/config.sub, doc/misc/texinfo.tex: * lib/careadlinkat.c, lib/careadlinkat.h, lib/count-leading-zeros.h: * lib/count-trailing-zeros.h, lib/diffseq.h, lib/fcntl.in.h: * lib/ftoastr.c, lib/get-permissions.c: * lib/ieee754.in.h, lib/inttypes.in.h, lib/mktime.c, lib/open.c: * lib/pathmax.h, lib/pipe2.c, lib/stddef.in.h, lib/stdint.in.h: * lib/stdlib.in.h, lib/str-two-way.h, lib/string.in.h, lib/time.in.h: * lib/timegm.c, lib/unistd.in.h, m4/canonicalize.m4: * m4/extern-inline.m4, m4/fcntl_h.m4, m4/fdopendir.m4: * m4/getgroups.m4, m4/getopt.m4, m4/gettimeofday.m4: * m4/gnulib-common.m4, m4/largefile.m4: * m4/lstat.m4, m4/memmem.m4, m4/mktime.m4, m4/nocrash.m4, m4/open.m4: * m4/pselect.m4, m4/putenv.m4, m4/readlink.m4, m4/regex.m4: * m4/symlink.m4, m4/unistd_h.m4, m4/utimens.m4, m4/utimes.m4: Copy from Gnulib. * lib/gnulib.mk.in, m4/gnulib-comp.m4: Regenerate. * m4/open-slash.m4: New file, copied from Gnulib.
452 lines
18 KiB
Plaintext
452 lines
18 KiB
Plaintext
# gnulib-common.m4 serial 45
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dnl Copyright (C) 2007-2019 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_PREREQ([2.62])
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# gl_COMMON
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# is expanded unconditionally through gnulib-tool magic.
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AC_DEFUN([gl_COMMON], [
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dnl Use AC_REQUIRE here, so that the code is expanded once only.
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AC_REQUIRE([gl_00GNULIB])
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AC_REQUIRE([gl_COMMON_BODY])
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])
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AC_DEFUN([gl_COMMON_BODY], [
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AH_VERBATIM([_Noreturn],
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[/* The _Noreturn keyword of C11. */
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#ifndef _Noreturn
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# if (defined __cplusplus \
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&& ((201103 <= __cplusplus && !(__GNUC__ == 4 && __GNUC_MINOR__ == 7)) \
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|| (defined _MSC_VER && 1900 <= _MSC_VER)))
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# define _Noreturn [[noreturn]]
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# elif ((!defined __cplusplus || defined __clang__) \
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&& (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) \
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|| 4 < __GNUC__ + (7 <= __GNUC_MINOR__)))
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/* _Noreturn works as-is. */
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# elif 2 < __GNUC__ + (8 <= __GNUC_MINOR__) || 0x5110 <= __SUNPRO_C
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# define _Noreturn __attribute__ ((__noreturn__))
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# elif 1200 <= (defined _MSC_VER ? _MSC_VER : 0)
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# define _Noreturn __declspec (noreturn)
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# else
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# define _Noreturn
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# endif
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#endif
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])
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AH_VERBATIM([isoc99_inline],
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[/* Work around a bug in Apple GCC 4.0.1 build 5465: In C99 mode, it supports
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the ISO C 99 semantics of 'extern inline' (unlike the GNU C semantics of
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earlier versions), but does not display it by setting __GNUC_STDC_INLINE__.
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__APPLE__ && __MACH__ test for Mac OS X.
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__APPLE_CC__ tests for the Apple compiler and its version.
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__STDC_VERSION__ tests for the C99 mode. */
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#if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__
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# define __GNUC_STDC_INLINE__ 1
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#endif])
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AH_VERBATIM([unused_parameter],
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[/* Define as a marker that can be attached to declarations that might not
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be used. This helps to reduce warnings, such as from
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GCC -Wunused-parameter. */
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#if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
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# define _GL_UNUSED __attribute__ ((__unused__))
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#else
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# define _GL_UNUSED
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#endif
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/* The name _UNUSED_PARAMETER_ is an earlier spelling, although the name
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is a misnomer outside of parameter lists. */
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#define _UNUSED_PARAMETER_ _GL_UNUSED
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/* gcc supports the "unused" attribute on possibly unused labels, and
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g++ has since version 4.5. Note to support C++ as well as C,
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_GL_UNUSED_LABEL should be used with a trailing ; */
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#if !defined __cplusplus || __GNUC__ > 4 \
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|| (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
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# define _GL_UNUSED_LABEL _GL_UNUSED
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#else
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# define _GL_UNUSED_LABEL
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#endif
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/* The __pure__ attribute was added in gcc 2.96. */
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#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
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# define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
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#else
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# define _GL_ATTRIBUTE_PURE /* empty */
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#endif
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/* The __const__ attribute was added in gcc 2.95. */
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#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
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# define _GL_ATTRIBUTE_CONST __attribute__ ((__const__))
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#else
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# define _GL_ATTRIBUTE_CONST /* empty */
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#endif
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/* The __malloc__ attribute was added in gcc 3. */
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#if 3 <= __GNUC__
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# define _GL_ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
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#else
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# define _GL_ATTRIBUTE_MALLOC /* empty */
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#endif
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])
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AH_VERBATIM([async_safe],
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[/* The _GL_ASYNC_SAFE marker should be attached to functions that are
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signal handlers (for signals other than SIGABRT, SIGPIPE) or can be
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invoked from such signal handlers. Such functions have some restrictions:
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* All functions that it calls should be marked _GL_ASYNC_SAFE as well,
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or should be listed as async-signal-safe in POSIX
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<https://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#tag_15_04>
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section 2.4.3. Note that malloc(), sprintf(), and fwrite(), in
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particular, are NOT async-signal-safe.
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* All memory locations (variables and struct fields) that these functions
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access must be marked 'volatile'. This holds for both read and write
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accesses. Otherwise the compiler might optimize away stores to and
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reads from such locations that occur in the program, depending on its
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data flow analysis. For example, when the program contains a loop
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that is intended to inspect a variable set from within a signal handler
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while (!signal_occurred)
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;
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the compiler is allowed to transform this into an endless loop if the
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variable 'signal_occurred' is not declared 'volatile'.
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Additionally, recall that:
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* A signal handler should not modify errno (except if it is a handler
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for a fatal signal and ends by raising the same signal again, thus
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provoking the termination of the process). If it invokes a function
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that may clobber errno, it needs to save and restore the value of
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errno. */
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#define _GL_ASYNC_SAFE
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])
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dnl Hint which direction to take regarding cross-compilation guesses:
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dnl When a user installs a program on a platform they are not intimately
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dnl familiar with, --enable-cross-guesses=conservative is the appropriate
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dnl choice. It implements the "If we don't know, assume the worst" principle.
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dnl However, when an operating system developer (on a platform which is not
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dnl yet known to gnulib) builds packages for their platform, they want to
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dnl expose, not hide, possible platform bugs; in this case,
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dnl --enable-cross-guesses=risky is the appropriate choice.
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dnl Sets the variables
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dnl gl_cross_guess_normal (to be used when 'yes' is good and 'no' is bad),
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dnl gl_cross_guess_inverted (to be used when 'no' is good and 'yes' is bad).
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AC_ARG_ENABLE([cross-guesses],
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[AS_HELP_STRING([--enable-cross-guesses={conservative|risky}],
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[specify policy for cross-compilation guesses])],
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[if test "x$enableval" != xconservative && test "x$enableval" != xrisky; then
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AC_MSG_WARN([invalid argument supplied to --enable-cross-guesses])
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enableval=conservative
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fi
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gl_cross_guesses="$enableval"],
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[gl_cross_guesses=conservative])
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if test $gl_cross_guesses = risky; then
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gl_cross_guess_normal="guessing yes"
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gl_cross_guess_inverted="guessing no"
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else
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gl_cross_guess_normal="guessing no"
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gl_cross_guess_inverted="guessing yes"
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fi
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dnl Preparation for running test programs:
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dnl Tell glibc to write diagnostics from -D_FORTIFY_SOURCE=2 to stderr, not
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dnl to /dev/tty, so they can be redirected to log files. Such diagnostics
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dnl arise e.g., in the macros gl_PRINTF_DIRECTIVE_N, gl_SNPRINTF_DIRECTIVE_N.
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LIBC_FATAL_STDERR_=1
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export LIBC_FATAL_STDERR_
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])
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# gl_MODULE_INDICATOR_CONDITION
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# expands to a C preprocessor expression that evaluates to 1 or 0, depending
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# whether a gnulib module that has been requested shall be considered present
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# or not.
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m4_define([gl_MODULE_INDICATOR_CONDITION], [1])
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# gl_MODULE_INDICATOR_SET_VARIABLE([modulename])
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# sets the shell variable that indicates the presence of the given module to
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# a C preprocessor expression that will evaluate to 1.
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AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE],
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[
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gl_MODULE_INDICATOR_SET_VARIABLE_AUX(
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[GNULIB_[]m4_translit([[$1]],
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[abcdefghijklmnopqrstuvwxyz./-],
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[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])],
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[gl_MODULE_INDICATOR_CONDITION])
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])
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# gl_MODULE_INDICATOR_SET_VARIABLE_AUX([variable])
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# modifies the shell variable to include the gl_MODULE_INDICATOR_CONDITION.
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# The shell variable's value is a C preprocessor expression that evaluates
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# to 0 or 1.
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AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX],
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[
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m4_if(m4_defn([gl_MODULE_INDICATOR_CONDITION]), [1],
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[
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dnl Simplify the expression VALUE || 1 to 1.
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$1=1
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],
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[gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([$1],
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[gl_MODULE_INDICATOR_CONDITION])])
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])
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# gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([variable], [condition])
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# modifies the shell variable to include the given condition. The shell
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# variable's value is a C preprocessor expression that evaluates to 0 or 1.
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AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR],
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[
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dnl Simplify the expression 1 || CONDITION to 1.
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if test "$[]$1" != 1; then
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dnl Simplify the expression 0 || CONDITION to CONDITION.
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if test "$[]$1" = 0; then
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$1=$2
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else
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$1="($[]$1 || $2)"
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fi
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fi
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])
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# gl_MODULE_INDICATOR([modulename])
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# defines a C macro indicating the presence of the given module
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# in a location where it can be used.
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# | Value | Value |
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# | in lib/ | in tests/ |
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# --------------------------------------------+---------+-----------+
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# Module present among main modules: | 1 | 1 |
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# --------------------------------------------+---------+-----------+
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# Module present among tests-related modules: | 0 | 1 |
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# --------------------------------------------+---------+-----------+
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# Module not present at all: | 0 | 0 |
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# --------------------------------------------+---------+-----------+
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AC_DEFUN([gl_MODULE_INDICATOR],
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[
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AC_DEFINE_UNQUOTED([GNULIB_]m4_translit([[$1]],
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[abcdefghijklmnopqrstuvwxyz./-],
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[ABCDEFGHIJKLMNOPQRSTUVWXYZ___]),
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[gl_MODULE_INDICATOR_CONDITION],
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[Define to a C preprocessor expression that evaluates to 1 or 0,
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depending whether the gnulib module $1 shall be considered present.])
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])
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# gl_MODULE_INDICATOR_FOR_TESTS([modulename])
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# defines a C macro indicating the presence of the given module
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# in lib or tests. This is useful to determine whether the module
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# should be tested.
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# | Value | Value |
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# | in lib/ | in tests/ |
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# --------------------------------------------+---------+-----------+
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# Module present among main modules: | 1 | 1 |
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# --------------------------------------------+---------+-----------+
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# Module present among tests-related modules: | 1 | 1 |
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# --------------------------------------------+---------+-----------+
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# Module not present at all: | 0 | 0 |
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# --------------------------------------------+---------+-----------+
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AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS],
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[
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AC_DEFINE([GNULIB_TEST_]m4_translit([[$1]],
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[abcdefghijklmnopqrstuvwxyz./-],
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[ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],
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[Define to 1 when the gnulib module $1 should be tested.])
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])
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# gl_ASSERT_NO_GNULIB_POSIXCHECK
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# asserts that there will never be a need to #define GNULIB_POSIXCHECK.
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# and thereby enables an optimization of configure and config.h.
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# Used by Emacs.
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AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK],
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[
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dnl Override gl_WARN_ON_USE_PREPARE.
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dnl But hide this definition from 'aclocal'.
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AC_DEFUN([gl_W][ARN_ON_USE_PREPARE], [])
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])
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# gl_ASSERT_NO_GNULIB_TESTS
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# asserts that there will be no gnulib tests in the scope of the configure.ac
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# and thereby enables an optimization of config.h.
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# Used by Emacs.
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AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS],
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[
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dnl Override gl_MODULE_INDICATOR_FOR_TESTS.
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AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], [])
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])
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# Test whether <features.h> exists.
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# Set HAVE_FEATURES_H.
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AC_DEFUN([gl_FEATURES_H],
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[
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AC_CHECK_HEADERS_ONCE([features.h])
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if test $ac_cv_header_features_h = yes; then
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HAVE_FEATURES_H=1
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else
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HAVE_FEATURES_H=0
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fi
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AC_SUBST([HAVE_FEATURES_H])
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])
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# AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH])
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# ----------------------------------------------------
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# Backport of autoconf-2.63b's macro.
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# Remove this macro when we can assume autoconf >= 2.64.
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m4_ifndef([AS_VAR_IF],
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[m4_define([AS_VAR_IF],
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[AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])])
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# gl_PROG_CC_C99
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# Modifies the value of the shell variable CC in an attempt to make $CC
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# understand ISO C99 source code.
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# This is like AC_PROG_CC_C99, except that
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# - AC_PROG_CC_C99 does not mix well with AC_PROG_CC_STDC
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# <https://lists.gnu.org/r/bug-gnulib/2011-09/msg00367.html>,
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# but many more packages use AC_PROG_CC_STDC than AC_PROG_CC_C99
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# <https://lists.gnu.org/r/bug-gnulib/2011-09/msg00441.html>.
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# Remaining problems:
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# - When AC_PROG_CC_STDC is invoked twice, it adds the C99 enabling options
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# to CC twice
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# <https://lists.gnu.org/r/bug-gnulib/2011-09/msg00431.html>.
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# - AC_PROG_CC_STDC is likely to change now that C11 is an ISO standard.
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AC_DEFUN([gl_PROG_CC_C99],
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[
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dnl Change that version number to the minimum Autoconf version that supports
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dnl mixing AC_PROG_CC_C99 calls with AC_PROG_CC_STDC calls.
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m4_version_prereq([9.0],
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[AC_REQUIRE([AC_PROG_CC_C99])],
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[AC_REQUIRE([AC_PROG_CC_STDC])])
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])
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# gl_PROG_AR_RANLIB
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# Determines the values for AR, ARFLAGS, RANLIB that fit with the compiler.
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# The user can set the variables AR, ARFLAGS, RANLIB if he wants to override
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# the values.
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AC_DEFUN([gl_PROG_AR_RANLIB],
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[
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dnl Minix 3 comes with two toolchains: The Amsterdam Compiler Kit compiler
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dnl as "cc", and GCC as "gcc". They have different object file formats and
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dnl library formats. In particular, the GNU binutils programs ar and ranlib
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dnl produce libraries that work only with gcc, not with cc.
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AC_REQUIRE([AC_PROG_CC])
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dnl The '][' hides this use from 'aclocal'.
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AC_BEFORE([$0], [A][M_PROG_AR])
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AC_CACHE_CHECK([for Minix Amsterdam compiler], [gl_cv_c_amsterdam_compiler],
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[
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AC_EGREP_CPP([Amsterdam],
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[
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#ifdef __ACK__
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Amsterdam
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#endif
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],
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[gl_cv_c_amsterdam_compiler=yes],
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[gl_cv_c_amsterdam_compiler=no])
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])
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dnl Don't compete with AM_PROG_AR's decision about AR/ARFLAGS if we are not
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dnl building with __ACK__.
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if test $gl_cv_c_amsterdam_compiler = yes; then
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if test -z "$AR"; then
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AR='cc -c.a'
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fi
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if test -z "$ARFLAGS"; then
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ARFLAGS='-o'
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fi
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else
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dnl AM_PROG_AR was added in automake v1.11.2. AM_PROG_AR does not AC_SUBST
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dnl ARFLAGS variable (it is filed into Makefile.in directly by automake
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dnl script on-demand, if not specified by ./configure of course).
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dnl Don't AC_REQUIRE the AM_PROG_AR otherwise the code for __ACK__ above
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dnl will be ignored. Also, pay attention to call AM_PROG_AR in else block
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dnl because AM_PROG_AR is written so it could re-set AR variable even for
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dnl __ACK__. It may seem like its easier to avoid calling the macro here,
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dnl but we need to AC_SUBST both AR/ARFLAGS (thus those must have some good
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dnl default value and automake should usually know them).
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dnl
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dnl The '][' hides this use from 'aclocal'.
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m4_ifdef([A][M_PROG_AR], [A][M_PROG_AR], [:])
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fi
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dnl In case the code above has not helped with setting AR/ARFLAGS, use
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dnl Automake-documented default values for AR and ARFLAGS, but prefer
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dnl ${host}-ar over ar (useful for cross-compiling).
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AC_CHECK_TOOL([AR], [ar], [ar])
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if test -z "$ARFLAGS"; then
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ARFLAGS='cr'
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fi
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AC_SUBST([AR])
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AC_SUBST([ARFLAGS])
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if test -z "$RANLIB"; then
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if test $gl_cv_c_amsterdam_compiler = yes; then
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RANLIB=':'
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else
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dnl Use the ranlib program if it is available.
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AC_PROG_RANLIB
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fi
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fi
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AC_SUBST([RANLIB])
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])
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# AC_C_RESTRICT
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|
# This definition is copied from post-2.69 Autoconf and overrides the
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|
# AC_C_RESTRICT macro from autoconf 2.60..2.69. It can be removed
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|
# once autoconf >= 2.70 can be assumed. It's painful to check version
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|
# numbers, and in practice this macro is more up-to-date than Autoconf
|
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# is, so override Autoconf unconditionally.
|
|
AC_DEFUN([AC_C_RESTRICT],
|
|
[AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict],
|
|
[ac_cv_c_restrict=no
|
|
# The order here caters to the fact that C++ does not require restrict.
|
|
for ac_kw in __restrict __restrict__ _Restrict restrict; do
|
|
AC_COMPILE_IFELSE(
|
|
[AC_LANG_PROGRAM(
|
|
[[typedef int *int_ptr;
|
|
int foo (int_ptr $ac_kw ip) { return ip[0]; }
|
|
int bar (int [$ac_kw]); /* Catch GCC bug 14050. */
|
|
int bar (int ip[$ac_kw]) { return ip[0]; }
|
|
]],
|
|
[[int s[1];
|
|
int *$ac_kw t = s;
|
|
t[0] = 0;
|
|
return foo (t) + bar (t);
|
|
]])],
|
|
[ac_cv_c_restrict=$ac_kw])
|
|
test "$ac_cv_c_restrict" != no && break
|
|
done
|
|
])
|
|
AH_VERBATIM([restrict],
|
|
[/* Define to the equivalent of the C99 'restrict' keyword, or to
|
|
nothing if this is not supported. Do not define if restrict is
|
|
supported directly. */
|
|
#undef restrict
|
|
/* Work around a bug in Sun C++: it does not support _Restrict or
|
|
__restrict__, even though the corresponding Sun C compiler ends up with
|
|
"#define restrict _Restrict" or "#define restrict __restrict__" in the
|
|
previous line. Perhaps some future version of Sun C++ will work with
|
|
restrict; if so, hopefully it defines __RESTRICT like Sun C does. */
|
|
#if defined __SUNPRO_CC && !defined __RESTRICT
|
|
# define _Restrict
|
|
# define __restrict__
|
|
#endif])
|
|
case $ac_cv_c_restrict in
|
|
restrict) ;;
|
|
no) AC_DEFINE([restrict], []) ;;
|
|
*) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
|
|
esac
|
|
])# AC_C_RESTRICT
|
|
|
|
# gl_BIGENDIAN
|
|
# is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd.
|
|
# Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some
|
|
# macros invoke AC_C_BIGENDIAN with arguments.
|
|
AC_DEFUN([gl_BIGENDIAN],
|
|
[
|
|
AC_C_BIGENDIAN
|
|
])
|
|
|
|
# gl_CACHE_VAL_SILENT(cache-id, command-to-set-it)
|
|
# is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not
|
|
# output a spurious "(cached)" mark in the midst of other configure output.
|
|
# This macro should be used instead of AC_CACHE_VAL when it is not surrounded
|
|
# by an AC_MSG_CHECKING/AC_MSG_RESULT pair.
|
|
AC_DEFUN([gl_CACHE_VAL_SILENT],
|
|
[
|
|
saved_as_echo_n="$as_echo_n"
|
|
as_echo_n=':'
|
|
AC_CACHE_VAL([$1], [$2])
|
|
as_echo_n="$saved_as_echo_n"
|
|
])
|
|
|
|
# AS_VAR_COPY was added in autoconf 2.63b
|
|
m4_define_default([AS_VAR_COPY],
|
|
[AS_LITERAL_IF([$1[]$2], [$1=$$2], [eval $1=\$$2])])
|