mirror of https://gitee.com/openkylin/wget.git
425 lines
16 KiB
Plaintext
425 lines
16 KiB
Plaintext
# gnulib-common.m4 serial 44
|
|
dnl Copyright (C) 2007-2019 Free Software Foundation, Inc.
|
|
dnl This file is free software; the Free Software Foundation
|
|
dnl gives unlimited permission to copy and/or distribute it,
|
|
dnl with or without modifications, as long as this notice is preserved.
|
|
|
|
AC_PREREQ([2.62])
|
|
|
|
# gl_COMMON
|
|
# is expanded unconditionally through gnulib-tool magic.
|
|
AC_DEFUN([gl_COMMON], [
|
|
dnl Use AC_REQUIRE here, so that the code is expanded once only.
|
|
AC_REQUIRE([gl_00GNULIB])
|
|
AC_REQUIRE([gl_COMMON_BODY])
|
|
])
|
|
AC_DEFUN([gl_COMMON_BODY], [
|
|
AH_VERBATIM([_Noreturn],
|
|
[/* The _Noreturn keyword of C11. */
|
|
#ifndef _Noreturn
|
|
# if (defined __cplusplus \
|
|
&& ((201103 <= __cplusplus && !(__GNUC__ == 4 && __GNUC_MINOR__ == 7)) \
|
|
|| (defined _MSC_VER && 1900 <= _MSC_VER)))
|
|
# define _Noreturn [[noreturn]]
|
|
# elif ((!defined __cplusplus || defined __clang__) \
|
|
&& (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) \
|
|
|| 4 < __GNUC__ + (7 <= __GNUC_MINOR__)))
|
|
/* _Noreturn works as-is. */
|
|
# elif 2 < __GNUC__ + (8 <= __GNUC_MINOR__) || 0x5110 <= __SUNPRO_C
|
|
# define _Noreturn __attribute__ ((__noreturn__))
|
|
# elif 1200 <= (defined _MSC_VER ? _MSC_VER : 0)
|
|
# define _Noreturn __declspec (noreturn)
|
|
# else
|
|
# define _Noreturn
|
|
# endif
|
|
#endif
|
|
])
|
|
AH_VERBATIM([isoc99_inline],
|
|
[/* Work around a bug in Apple GCC 4.0.1 build 5465: In C99 mode, it supports
|
|
the ISO C 99 semantics of 'extern inline' (unlike the GNU C semantics of
|
|
earlier versions), but does not display it by setting __GNUC_STDC_INLINE__.
|
|
__APPLE__ && __MACH__ test for Mac OS X.
|
|
__APPLE_CC__ tests for the Apple compiler and its version.
|
|
__STDC_VERSION__ tests for the C99 mode. */
|
|
#if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__
|
|
# define __GNUC_STDC_INLINE__ 1
|
|
#endif])
|
|
AH_VERBATIM([unused_parameter],
|
|
[/* Define as a marker that can be attached to declarations that might not
|
|
be used. This helps to reduce warnings, such as from
|
|
GCC -Wunused-parameter. */
|
|
#if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
|
|
# define _GL_UNUSED __attribute__ ((__unused__))
|
|
#else
|
|
# define _GL_UNUSED
|
|
#endif
|
|
/* The name _UNUSED_PARAMETER_ is an earlier spelling, although the name
|
|
is a misnomer outside of parameter lists. */
|
|
#define _UNUSED_PARAMETER_ _GL_UNUSED
|
|
|
|
/* gcc supports the "unused" attribute on possibly unused labels, and
|
|
g++ has since version 4.5. Note to support C++ as well as C,
|
|
_GL_UNUSED_LABEL should be used with a trailing ; */
|
|
#if !defined __cplusplus || __GNUC__ > 4 \
|
|
|| (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
|
|
# define _GL_UNUSED_LABEL _GL_UNUSED
|
|
#else
|
|
# define _GL_UNUSED_LABEL
|
|
#endif
|
|
|
|
/* The __pure__ attribute was added in gcc 2.96. */
|
|
#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
|
|
# define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
|
|
#else
|
|
# define _GL_ATTRIBUTE_PURE /* empty */
|
|
#endif
|
|
|
|
/* The __const__ attribute was added in gcc 2.95. */
|
|
#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
|
|
# define _GL_ATTRIBUTE_CONST __attribute__ ((__const__))
|
|
#else
|
|
# define _GL_ATTRIBUTE_CONST /* empty */
|
|
#endif
|
|
|
|
/* The __malloc__ attribute was added in gcc 3. */
|
|
#if 3 <= __GNUC__
|
|
# define _GL_ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
|
|
#else
|
|
# define _GL_ATTRIBUTE_MALLOC /* empty */
|
|
#endif
|
|
])
|
|
AH_VERBATIM([async_safe],
|
|
[/* The _GL_ASYNC_SAFE marker should be attached to functions that are
|
|
signal handlers (for signals other than SIGABRT, SIGPIPE) or can be
|
|
invoked from such signal handlers. Such functions have some restrictions:
|
|
* All functions that it calls should be marked _GL_ASYNC_SAFE as well,
|
|
or should be listed as async-signal-safe in POSIX
|
|
<http://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#tag_15_04>
|
|
section 2.4.3. Note that malloc(), sprintf(), and fwrite(), in
|
|
particular, are NOT async-signal-safe.
|
|
* All memory locations (variables and struct fields) that these functions
|
|
access must be marked 'volatile'. This holds for both read and write
|
|
accesses. Otherwise the compiler might optimize away stores to and
|
|
reads from such locations that occur in the program, depending on its
|
|
data flow analysis. For example, when the program contains a loop
|
|
that is intended to inspect a variable set from within a signal handler
|
|
while (!signal_occurred)
|
|
;
|
|
the compiler is allowed to transform this into an endless loop if the
|
|
variable 'signal_occurred' is not declared 'volatile'.
|
|
Additionally, recall that:
|
|
* A signal handler should not modify errno (except if it is a handler
|
|
for a fatal signal and ends by raising the same signal again, thus
|
|
provoking the termination of the process). If it invokes a function
|
|
that may clobber errno, it needs to save and restore the value of
|
|
errno. */
|
|
#define _GL_ASYNC_SAFE
|
|
])
|
|
dnl Preparation for running test programs:
|
|
dnl Tell glibc to write diagnostics from -D_FORTIFY_SOURCE=2 to stderr, not
|
|
dnl to /dev/tty, so they can be redirected to log files. Such diagnostics
|
|
dnl arise e.g., in the macros gl_PRINTF_DIRECTIVE_N, gl_SNPRINTF_DIRECTIVE_N.
|
|
LIBC_FATAL_STDERR_=1
|
|
export LIBC_FATAL_STDERR_
|
|
])
|
|
|
|
# gl_MODULE_INDICATOR_CONDITION
|
|
# expands to a C preprocessor expression that evaluates to 1 or 0, depending
|
|
# whether a gnulib module that has been requested shall be considered present
|
|
# or not.
|
|
m4_define([gl_MODULE_INDICATOR_CONDITION], [1])
|
|
|
|
# gl_MODULE_INDICATOR_SET_VARIABLE([modulename])
|
|
# sets the shell variable that indicates the presence of the given module to
|
|
# a C preprocessor expression that will evaluate to 1.
|
|
AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE],
|
|
[
|
|
gl_MODULE_INDICATOR_SET_VARIABLE_AUX(
|
|
[GNULIB_[]m4_translit([[$1]],
|
|
[abcdefghijklmnopqrstuvwxyz./-],
|
|
[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])],
|
|
[gl_MODULE_INDICATOR_CONDITION])
|
|
])
|
|
|
|
# gl_MODULE_INDICATOR_SET_VARIABLE_AUX([variable])
|
|
# modifies the shell variable to include the gl_MODULE_INDICATOR_CONDITION.
|
|
# The shell variable's value is a C preprocessor expression that evaluates
|
|
# to 0 or 1.
|
|
AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX],
|
|
[
|
|
m4_if(m4_defn([gl_MODULE_INDICATOR_CONDITION]), [1],
|
|
[
|
|
dnl Simplify the expression VALUE || 1 to 1.
|
|
$1=1
|
|
],
|
|
[gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([$1],
|
|
[gl_MODULE_INDICATOR_CONDITION])])
|
|
])
|
|
|
|
# gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([variable], [condition])
|
|
# modifies the shell variable to include the given condition. The shell
|
|
# variable's value is a C preprocessor expression that evaluates to 0 or 1.
|
|
AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR],
|
|
[
|
|
dnl Simplify the expression 1 || CONDITION to 1.
|
|
if test "$[]$1" != 1; then
|
|
dnl Simplify the expression 0 || CONDITION to CONDITION.
|
|
if test "$[]$1" = 0; then
|
|
$1=$2
|
|
else
|
|
$1="($[]$1 || $2)"
|
|
fi
|
|
fi
|
|
])
|
|
|
|
# gl_MODULE_INDICATOR([modulename])
|
|
# defines a C macro indicating the presence of the given module
|
|
# in a location where it can be used.
|
|
# | Value | Value |
|
|
# | in lib/ | in tests/ |
|
|
# --------------------------------------------+---------+-----------+
|
|
# Module present among main modules: | 1 | 1 |
|
|
# --------------------------------------------+---------+-----------+
|
|
# Module present among tests-related modules: | 0 | 1 |
|
|
# --------------------------------------------+---------+-----------+
|
|
# Module not present at all: | 0 | 0 |
|
|
# --------------------------------------------+---------+-----------+
|
|
AC_DEFUN([gl_MODULE_INDICATOR],
|
|
[
|
|
AC_DEFINE_UNQUOTED([GNULIB_]m4_translit([[$1]],
|
|
[abcdefghijklmnopqrstuvwxyz./-],
|
|
[ABCDEFGHIJKLMNOPQRSTUVWXYZ___]),
|
|
[gl_MODULE_INDICATOR_CONDITION],
|
|
[Define to a C preprocessor expression that evaluates to 1 or 0,
|
|
depending whether the gnulib module $1 shall be considered present.])
|
|
])
|
|
|
|
# gl_MODULE_INDICATOR_FOR_TESTS([modulename])
|
|
# defines a C macro indicating the presence of the given module
|
|
# in lib or tests. This is useful to determine whether the module
|
|
# should be tested.
|
|
# | Value | Value |
|
|
# | in lib/ | in tests/ |
|
|
# --------------------------------------------+---------+-----------+
|
|
# Module present among main modules: | 1 | 1 |
|
|
# --------------------------------------------+---------+-----------+
|
|
# Module present among tests-related modules: | 1 | 1 |
|
|
# --------------------------------------------+---------+-----------+
|
|
# Module not present at all: | 0 | 0 |
|
|
# --------------------------------------------+---------+-----------+
|
|
AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS],
|
|
[
|
|
AC_DEFINE([GNULIB_TEST_]m4_translit([[$1]],
|
|
[abcdefghijklmnopqrstuvwxyz./-],
|
|
[ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],
|
|
[Define to 1 when the gnulib module $1 should be tested.])
|
|
])
|
|
|
|
# gl_ASSERT_NO_GNULIB_POSIXCHECK
|
|
# asserts that there will never be a need to #define GNULIB_POSIXCHECK.
|
|
# and thereby enables an optimization of configure and config.h.
|
|
# Used by Emacs.
|
|
AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK],
|
|
[
|
|
dnl Override gl_WARN_ON_USE_PREPARE.
|
|
dnl But hide this definition from 'aclocal'.
|
|
AC_DEFUN([gl_W][ARN_ON_USE_PREPARE], [])
|
|
])
|
|
|
|
# gl_ASSERT_NO_GNULIB_TESTS
|
|
# asserts that there will be no gnulib tests in the scope of the configure.ac
|
|
# and thereby enables an optimization of config.h.
|
|
# Used by Emacs.
|
|
AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS],
|
|
[
|
|
dnl Override gl_MODULE_INDICATOR_FOR_TESTS.
|
|
AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], [])
|
|
])
|
|
|
|
# Test whether <features.h> exists.
|
|
# Set HAVE_FEATURES_H.
|
|
AC_DEFUN([gl_FEATURES_H],
|
|
[
|
|
AC_CHECK_HEADERS_ONCE([features.h])
|
|
if test $ac_cv_header_features_h = yes; then
|
|
HAVE_FEATURES_H=1
|
|
else
|
|
HAVE_FEATURES_H=0
|
|
fi
|
|
AC_SUBST([HAVE_FEATURES_H])
|
|
])
|
|
|
|
# AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH])
|
|
# ----------------------------------------------------
|
|
# Backport of autoconf-2.63b's macro.
|
|
# Remove this macro when we can assume autoconf >= 2.64.
|
|
m4_ifndef([AS_VAR_IF],
|
|
[m4_define([AS_VAR_IF],
|
|
[AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])])
|
|
|
|
# gl_PROG_CC_C99
|
|
# Modifies the value of the shell variable CC in an attempt to make $CC
|
|
# understand ISO C99 source code.
|
|
# This is like AC_PROG_CC_C99, except that
|
|
# - AC_PROG_CC_C99 does not mix well with AC_PROG_CC_STDC
|
|
# <https://lists.gnu.org/r/bug-gnulib/2011-09/msg00367.html>,
|
|
# but many more packages use AC_PROG_CC_STDC than AC_PROG_CC_C99
|
|
# <https://lists.gnu.org/r/bug-gnulib/2011-09/msg00441.html>.
|
|
# Remaining problems:
|
|
# - When AC_PROG_CC_STDC is invoked twice, it adds the C99 enabling options
|
|
# to CC twice
|
|
# <https://lists.gnu.org/r/bug-gnulib/2011-09/msg00431.html>.
|
|
# - AC_PROG_CC_STDC is likely to change now that C11 is an ISO standard.
|
|
AC_DEFUN([gl_PROG_CC_C99],
|
|
[
|
|
dnl Change that version number to the minimum Autoconf version that supports
|
|
dnl mixing AC_PROG_CC_C99 calls with AC_PROG_CC_STDC calls.
|
|
m4_version_prereq([9.0],
|
|
[AC_REQUIRE([AC_PROG_CC_C99])],
|
|
[AC_REQUIRE([AC_PROG_CC_STDC])])
|
|
])
|
|
|
|
# gl_PROG_AR_RANLIB
|
|
# Determines the values for AR, ARFLAGS, RANLIB that fit with the compiler.
|
|
# The user can set the variables AR, ARFLAGS, RANLIB if he wants to override
|
|
# the values.
|
|
AC_DEFUN([gl_PROG_AR_RANLIB],
|
|
[
|
|
dnl Minix 3 comes with two toolchains: The Amsterdam Compiler Kit compiler
|
|
dnl as "cc", and GCC as "gcc". They have different object file formats and
|
|
dnl library formats. In particular, the GNU binutils programs ar and ranlib
|
|
dnl produce libraries that work only with gcc, not with cc.
|
|
AC_REQUIRE([AC_PROG_CC])
|
|
dnl The '][' hides this use from 'aclocal'.
|
|
AC_BEFORE([$0], [A][M_PROG_AR])
|
|
AC_CACHE_CHECK([for Minix Amsterdam compiler], [gl_cv_c_amsterdam_compiler],
|
|
[
|
|
AC_EGREP_CPP([Amsterdam],
|
|
[
|
|
#ifdef __ACK__
|
|
Amsterdam
|
|
#endif
|
|
],
|
|
[gl_cv_c_amsterdam_compiler=yes],
|
|
[gl_cv_c_amsterdam_compiler=no])
|
|
])
|
|
|
|
dnl Don't compete with AM_PROG_AR's decision about AR/ARFLAGS if we are not
|
|
dnl building with __ACK__.
|
|
if test $gl_cv_c_amsterdam_compiler = yes; then
|
|
if test -z "$AR"; then
|
|
AR='cc -c.a'
|
|
fi
|
|
if test -z "$ARFLAGS"; then
|
|
ARFLAGS='-o'
|
|
fi
|
|
else
|
|
dnl AM_PROG_AR was added in automake v1.11.2. AM_PROG_AR does not AC_SUBST
|
|
dnl ARFLAGS variable (it is filed into Makefile.in directly by automake
|
|
dnl script on-demand, if not specified by ./configure of course).
|
|
dnl Don't AC_REQUIRE the AM_PROG_AR otherwise the code for __ACK__ above
|
|
dnl will be ignored. Also, pay attention to call AM_PROG_AR in else block
|
|
dnl because AM_PROG_AR is written so it could re-set AR variable even for
|
|
dnl __ACK__. It may seem like its easier to avoid calling the macro here,
|
|
dnl but we need to AC_SUBST both AR/ARFLAGS (thus those must have some good
|
|
dnl default value and automake should usually know them).
|
|
dnl
|
|
dnl The '][' hides this use from 'aclocal'.
|
|
m4_ifdef([A][M_PROG_AR], [A][M_PROG_AR], [:])
|
|
fi
|
|
|
|
dnl In case the code above has not helped with setting AR/ARFLAGS, use
|
|
dnl Automake-documented default values for AR and ARFLAGS, but prefer
|
|
dnl ${host}-ar over ar (useful for cross-compiling).
|
|
AC_CHECK_TOOL([AR], [ar], [ar])
|
|
if test -z "$ARFLAGS"; then
|
|
ARFLAGS='cr'
|
|
fi
|
|
|
|
AC_SUBST([AR])
|
|
AC_SUBST([ARFLAGS])
|
|
if test -z "$RANLIB"; then
|
|
if test $gl_cv_c_amsterdam_compiler = yes; then
|
|
RANLIB=':'
|
|
else
|
|
dnl Use the ranlib program if it is available.
|
|
AC_PROG_RANLIB
|
|
fi
|
|
fi
|
|
AC_SUBST([RANLIB])
|
|
])
|
|
|
|
# AC_C_RESTRICT
|
|
# This definition is copied from post-2.69 Autoconf and overrides the
|
|
# AC_C_RESTRICT macro from autoconf 2.60..2.69. It can be removed
|
|
# once autoconf >= 2.70 can be assumed. It's painful to check version
|
|
# numbers, and in practice this macro is more up-to-date than Autoconf
|
|
# 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])])
|