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Member "complexity-1.13/m4/gnulib-common.m4" (10 Oct 2020, 26477 Bytes) of package /linux/privat/complexity-1.13.tar.xz:


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    1 # gnulib-common.m4 serial 62
    2 dnl Copyright (C) 2007-2020 Free Software Foundation, Inc.
    3 dnl This file is free software; the Free Software Foundation
    4 dnl gives unlimited permission to copy and/or distribute it,
    5 dnl with or without modifications, as long as this notice is preserved.
    6 
    7 AC_PREREQ([2.62])
    8 
    9 # gl_COMMON
   10 # is expanded unconditionally through gnulib-tool magic.
   11 AC_DEFUN([gl_COMMON], [
   12   dnl Use AC_REQUIRE here, so that the code is expanded once only.
   13   AC_REQUIRE([gl_00GNULIB])
   14   AC_REQUIRE([gl_COMMON_BODY])
   15   AC_REQUIRE([gl_ZZGNULIB])
   16 ])
   17 AC_DEFUN([gl_COMMON_BODY], [
   18   AH_VERBATIM([_GL_GNUC_PREREQ],
   19 [/* True if the compiler says it groks GNU C version MAJOR.MINOR.  */
   20 #if defined __GNUC__ && defined __GNUC_MINOR__
   21 # define _GL_GNUC_PREREQ(major, minor) \
   22     ((major) < __GNUC__ + ((minor) <= __GNUC_MINOR__))
   23 #else
   24 # define _GL_GNUC_PREREQ(major, minor) 0
   25 #endif
   26 ])
   27   AH_VERBATIM([_Noreturn],
   28 [/* The _Noreturn keyword of C11.  */
   29 #ifndef _Noreturn
   30 # if (defined __cplusplus \
   31       && ((201103 <= __cplusplus && !(__GNUC__ == 4 && __GNUC_MINOR__ == 7)) \
   32           || (defined _MSC_VER && 1900 <= _MSC_VER)) \
   33       && 0)
   34     /* [[noreturn]] is not practically usable, because with it the syntax
   35          extern _Noreturn void func (...);
   36        would not be valid; such a declaration would only be valid with 'extern'
   37        and '_Noreturn' swapped, or without the 'extern' keyword.  However, some
   38        AIX system header files and several gnulib header files use precisely
   39        this syntax with 'extern'.  */
   40 #  define _Noreturn [[noreturn]]
   41 # elif ((!defined __cplusplus || defined __clang__) \
   42         && (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0)  \
   43             || _GL_GNUC_PREREQ (4, 7) \
   44             || (defined __apple_build_version__ \
   45                 ? 6000000 <= __apple_build_version__ \
   46                 : 3 < __clang_major__ + (5 <= __clang_minor__))))
   47    /* _Noreturn works as-is.  */
   48 # elif _GL_GNUC_PREREQ (2, 8) || defined __clang__ || 0x5110 <= __SUNPRO_C
   49 #  define _Noreturn __attribute__ ((__noreturn__))
   50 # elif 1200 <= (defined _MSC_VER ? _MSC_VER : 0)
   51 #  define _Noreturn __declspec (noreturn)
   52 # else
   53 #  define _Noreturn
   54 # endif
   55 #endif
   56 ])
   57   AH_VERBATIM([isoc99_inline],
   58 [/* Work around a bug in Apple GCC 4.0.1 build 5465: In C99 mode, it supports
   59    the ISO C 99 semantics of 'extern inline' (unlike the GNU C semantics of
   60    earlier versions), but does not display it by setting __GNUC_STDC_INLINE__.
   61    __APPLE__ && __MACH__ test for Mac OS X.
   62    __APPLE_CC__ tests for the Apple compiler and its version.
   63    __STDC_VERSION__ tests for the C99 mode.  */
   64 #if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__
   65 # define __GNUC_STDC_INLINE__ 1
   66 #endif])
   67   AH_VERBATIM([attribute],
   68 [/* Attributes.  */
   69 #ifdef __has_attribute
   70 # define _GL_HAS_ATTRIBUTE(attr) __has_attribute (__##attr##__)
   71 #else
   72 # define _GL_HAS_ATTRIBUTE(attr) _GL_ATTR_##attr
   73 # define _GL_ATTR_alloc_size _GL_GNUC_PREREQ (4, 3)
   74 # define _GL_ATTR_always_inline _GL_GNUC_PREREQ (3, 2)
   75 # define _GL_ATTR_artificial _GL_GNUC_PREREQ (4, 3)
   76 # define _GL_ATTR_cold _GL_GNUC_PREREQ (4, 3)
   77 # define _GL_ATTR_const _GL_GNUC_PREREQ (2, 95)
   78 # define _GL_ATTR_deprecated _GL_GNUC_PREREQ (3, 1)
   79 # define _GL_ATTR_diagnose_if 0
   80 # define _GL_ATTR_error _GL_GNUC_PREREQ (4, 3)
   81 # define _GL_ATTR_externally_visible _GL_GNUC_PREREQ (4, 1)
   82 # define _GL_ATTR_fallthrough _GL_GNUC_PREREQ (7, 0)
   83 # define _GL_ATTR_format _GL_GNUC_PREREQ (2, 7)
   84 # define _GL_ATTR_leaf _GL_GNUC_PREREQ (4, 6)
   85 # ifdef _ICC
   86 #  define _GL_ATTR_may_alias 0
   87 # else
   88 #  define _GL_ATTR_may_alias _GL_GNUC_PREREQ (3, 3)
   89 # endif
   90 # define _GL_ATTR_malloc _GL_GNUC_PREREQ (3, 0)
   91 # define _GL_ATTR_noinline _GL_GNUC_PREREQ (3, 1)
   92 # define _GL_ATTR_nonnull _GL_GNUC_PREREQ (3, 3)
   93 # define _GL_ATTR_nonstring _GL_GNUC_PREREQ (8, 0)
   94 # define _GL_ATTR_nothrow _GL_GNUC_PREREQ (3, 3)
   95 # define _GL_ATTR_packed _GL_GNUC_PREREQ (2, 7)
   96 # define _GL_ATTR_pure _GL_GNUC_PREREQ (2, 96)
   97 # define _GL_ATTR_returns_nonnull _GL_GNUC_PREREQ (4, 9)
   98 # define _GL_ATTR_sentinel _GL_GNUC_PREREQ (4, 0)
   99 # define _GL_ATTR_unused _GL_GNUC_PREREQ (2, 7)
  100 # define _GL_ATTR_warn_unused_result _GL_GNUC_PREREQ (3, 4)
  101 #endif
  102 
  103 ]dnl There is no _GL_ATTRIBUTE_ALIGNED; use stdalign's _Alignas instead.
  104 [
  105 #if _GL_HAS_ATTRIBUTE (alloc_size)
  106 # define _GL_ATTRIBUTE_ALLOC_SIZE(args) __attribute__ ((__alloc_size__ args))
  107 #else
  108 # define _GL_ATTRIBUTE_ALLOC_SIZE(args)
  109 #endif
  110 
  111 #if _GL_HAS_ATTRIBUTE (always_inline)
  112 # define _GL_ATTRIBUTE_ALWAYS_INLINE __attribute__ ((__always_inline__))
  113 #else
  114 # define _GL_ATTRIBUTE_ALWAYS_INLINE
  115 #endif
  116 
  117 #if _GL_HAS_ATTRIBUTE (artificial)
  118 # define _GL_ATTRIBUTE_ARTIFICIAL __attribute__ ((__artificial__))
  119 #else
  120 # define _GL_ATTRIBUTE_ARTIFICIAL
  121 #endif
  122 
  123 /* Avoid __attribute__ ((cold)) on MinGW; see thread starting at
  124    <https://lists.gnu.org/r/emacs-devel/2019-04/msg01152.html>.
  125    Also, Oracle Studio 12.6 requires 'cold' not '__cold__'.  */
  126 #if _GL_HAS_ATTRIBUTE (cold) && !defined __MINGW32__
  127 # ifndef __SUNPRO_C
  128 #  define _GL_ATTRIBUTE_COLD __attribute__ ((__cold__))
  129 # else
  130 #  define _GL_ATTRIBUTE_COLD __attribute__ ((cold))
  131 # endif
  132 #else
  133 # define _GL_ATTRIBUTE_COLD
  134 #endif
  135 
  136 #if _GL_HAS_ATTRIBUTE (const)
  137 # define _GL_ATTRIBUTE_CONST __attribute__ ((__const__))
  138 #else
  139 # define _GL_ATTRIBUTE_CONST
  140 #endif
  141 
  142 #if 201710L < __STDC_VERSION__
  143 # define _GL_ATTRIBUTE_DEPRECATED [[__deprecated__]]
  144 #elif _GL_HAS_ATTRIBUTE (deprecated)
  145 # define _GL_ATTRIBUTE_DEPRECATED __attribute__ ((__deprecated__))
  146 #else
  147 # define _GL_ATTRIBUTE_DEPRECATED
  148 #endif
  149 
  150 #if _GL_HAS_ATTRIBUTE (error)
  151 # define _GL_ATTRIBUTE_ERROR(msg) __attribute__ ((__error__ (msg)))
  152 # define _GL_ATTRIBUTE_WARNING(msg) __attribute__ ((__warning__ (msg)))
  153 #elif _GL_HAS_ATTRIBUTE (diagnose_if)
  154 # define _GL_ATTRIBUTE_ERROR(msg) __attribute__ ((__diagnose_if__ (1, msg, "error")))
  155 # define _GL_ATTRIBUTE_WARNING(msg) __attribute__ ((__diagnose_if__ (1, msg, "warning")))
  156 #else
  157 # define _GL_ATTRIBUTE_ERROR(msg)
  158 # define _GL_ATTRIBUTE_WARNING(msg)
  159 #endif
  160 
  161 #if _GL_HAS_ATTRIBUTE (externally_visible)
  162 # define _GL_ATTRIBUTE_EXTERNALLY_VISIBLE __attribute__ ((externally_visible))
  163 #else
  164 # define _GL_ATTRIBUTE_EXTERNALLY_VISIBLE
  165 #endif
  166 
  167 /* FALLTHROUGH is special, because it always expands to something.  */
  168 #if 201710L < __STDC_VERSION__
  169 # define _GL_ATTRIBUTE_FALLTHROUGH [[__fallthrough__]]
  170 #elif _GL_HAS_ATTRIBUTE (fallthrough)
  171 # define _GL_ATTRIBUTE_FALLTHROUGH __attribute__ ((__fallthrough__))
  172 #else
  173 # define _GL_ATTRIBUTE_FALLTHROUGH ((void) 0)
  174 #endif
  175 
  176 #if _GL_HAS_ATTRIBUTE (format)
  177 # define _GL_ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
  178 #else
  179 # define _GL_ATTRIBUTE_FORMAT(spec)
  180 #endif
  181 
  182 #if _GL_HAS_ATTRIBUTE (leaf)
  183 # define _GL_ATTRIBUTE_LEAF __attribute__ ((__leaf__))
  184 #else
  185 # define _GL_ATTRIBUTE_LEAF
  186 #endif
  187 
  188 /* Oracle Studio 12.6 mishandles may_alias despite __has_attribute OK.  */
  189 #if _GL_HAS_ATTRIBUTE (may_alias) && !defined __SUNPRO_C
  190 # define _GL_ATTRIBUTE_MAY_ALIAS __attribute__ ((__may_alias__))
  191 #else
  192 # define _GL_ATTRIBUTE_MAY_ALIAS
  193 #endif
  194 
  195 #if 201710L < __STDC_VERSION__
  196 # define _GL_ATTRIBUTE_MAYBE_UNUSED [[__maybe_unused__]]
  197 #elif _GL_HAS_ATTRIBUTE (unused)
  198 # define _GL_ATTRIBUTE_MAYBE_UNUSED __attribute__ ((__unused__))
  199 #else
  200 # define _GL_ATTRIBUTE_MAYBE_UNUSED
  201 #endif
  202 /* Earlier spellings of this macro.  */
  203 #define _GL_UNUSED _GL_ATTRIBUTE_MAYBE_UNUSED
  204 #define _UNUSED_PARAMETER_ _GL_ATTRIBUTE_MAYBE_UNUSED
  205 
  206 #if _GL_HAS_ATTRIBUTE (malloc)
  207 # define _GL_ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
  208 #else
  209 # define _GL_ATTRIBUTE_MALLOC
  210 #endif
  211 
  212 #if 201710L < __STDC_VERSION__
  213 # define _GL_ATTRIBUTE_NODISCARD [[__nodiscard__]]
  214 #elif _GL_HAS_ATTRIBUTE (warn_unused_result)
  215 # define _GL_ATTRIBUTE_NODISCARD __attribute__ ((__warn_unused_result__))
  216 #else
  217 # define _GL_ATTRIBUTE_NODISCARD
  218 #endif
  219 
  220 #if _GL_HAS_ATTRIBUTE (noinline)
  221 # define _GL_ATTRIBUTE_NOINLINE __attribute__ ((__noinline__))
  222 #else
  223 # define _GL_ATTRIBUTE_NOINLINE
  224 #endif
  225 
  226 #if _GL_HAS_ATTRIBUTE (nonnull)
  227 # define _GL_ATTRIBUTE_NONNULL(args) __attribute__ ((__nonnull__ args))
  228 #else
  229 # define _GL_ATTRIBUTE_NONNULL(args)
  230 #endif
  231 
  232 #if _GL_HAS_ATTRIBUTE (nonstring)
  233 # define _GL_ATTRIBUTE_NONSTRING __attribute__ ((__nonstring__))
  234 #else
  235 # define _GL_ATTRIBUTE_NONSTRING
  236 #endif
  237 
  238 /* There is no _GL_ATTRIBUTE_NORETURN; use _Noreturn instead.  */
  239 
  240 #if _GL_HAS_ATTRIBUTE (nothrow) && !defined __cplusplus
  241 # define _GL_ATTRIBUTE_NOTHROW __attribute__ ((__nothrow__))
  242 #else
  243 # define _GL_ATTRIBUTE_NOTHROW
  244 #endif
  245 
  246 #if _GL_HAS_ATTRIBUTE (packed)
  247 # define _GL_ATTRIBUTE_PACKED __attribute__ ((__packed__))
  248 #else
  249 # define _GL_ATTRIBUTE_PACKED
  250 #endif
  251 
  252 #if _GL_HAS_ATTRIBUTE (pure)
  253 # define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
  254 #else
  255 # define _GL_ATTRIBUTE_PURE
  256 #endif
  257 
  258 #if _GL_HAS_ATTRIBUTE (returns_nonnull)
  259 # define _GL_ATTRIBUTE_RETURNS_NONNULL __attribute__ ((__returns_nonnull__))
  260 #else
  261 # define _GL_ATTRIBUTE_RETURNS_NONNULL
  262 #endif
  263 
  264 #if _GL_HAS_ATTRIBUTE (sentinel)
  265 # define _GL_ATTRIBUTE_SENTINEL(pos) __attribute__ ((__sentinel__ pos))
  266 #else
  267 # define _GL_ATTRIBUTE_SENTINEL(pos)
  268 #endif
  269 
  270 ]dnl There is no _GL_ATTRIBUTE_VISIBILITY; see m4/visibility.m4 instead.
  271 [
  272 /* To support C++ as well as C, use _GL_UNUSED_LABEL with trailing ';'.  */
  273 #if !defined __cplusplus || _GL_GNUC_PREREQ (4, 5)
  274 # define _GL_UNUSED_LABEL _GL_ATTRIBUTE_MAYBE_UNUSED
  275 #else
  276 # define _GL_UNUSED_LABEL
  277 #endif
  278 ])
  279   AH_VERBATIM([async_safe],
  280 [/* The _GL_ASYNC_SAFE marker should be attached to functions that are
  281    signal handlers (for signals other than SIGABRT, SIGPIPE) or can be
  282    invoked from such signal handlers.  Such functions have some restrictions:
  283      * All functions that it calls should be marked _GL_ASYNC_SAFE as well,
  284        or should be listed as async-signal-safe in POSIX
  285        <https://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#tag_15_04>
  286        section 2.4.3.  Note that malloc(), sprintf(), and fwrite(), in
  287        particular, are NOT async-signal-safe.
  288      * All memory locations (variables and struct fields) that these functions
  289        access must be marked 'volatile'.  This holds for both read and write
  290        accesses.  Otherwise the compiler might optimize away stores to and
  291        reads from such locations that occur in the program, depending on its
  292        data flow analysis.  For example, when the program contains a loop
  293        that is intended to inspect a variable set from within a signal handler
  294            while (!signal_occurred)
  295              ;
  296        the compiler is allowed to transform this into an endless loop if the
  297        variable 'signal_occurred' is not declared 'volatile'.
  298    Additionally, recall that:
  299      * A signal handler should not modify errno (except if it is a handler
  300        for a fatal signal and ends by raising the same signal again, thus
  301        provoking the termination of the process).  If it invokes a function
  302        that may clobber errno, it needs to save and restore the value of
  303        errno.  */
  304 #define _GL_ASYNC_SAFE
  305 ])
  306   AH_VERBATIM([micro_optimizations],
  307 [/* _GL_CMP (n1, n2) performs a three-valued comparison on n1 vs. n2, where
  308    n1 and n2 are expressions without side effects, that evaluate to real
  309    numbers (excluding NaN).
  310    It returns
  311      1  if n1 > n2
  312      0  if n1 == n2
  313      -1 if n1 < n2
  314    The naïve code   (n1 > n2 ? 1 : n1 < n2 ? -1 : 0)  produces a conditional
  315    jump with nearly all GCC versions up to GCC 10.
  316    This variant     (n1 < n2 ? -1 : n1 > n2)  produces a conditional with many
  317    GCC versions up to GCC 9.
  318    The better code  (n1 > n2) - (n1 < n2)  from Hacker's Delight § 2-9
  319    avoids conditional jumps in all GCC versions >= 3.4.  */
  320 #define _GL_CMP(n1, n2) (((n1) > (n2)) - ((n1) < (n2)))
  321 ])
  322   dnl Hint which direction to take regarding cross-compilation guesses:
  323   dnl When a user installs a program on a platform they are not intimately
  324   dnl familiar with, --enable-cross-guesses=conservative is the appropriate
  325   dnl choice.  It implements the "If we don't know, assume the worst" principle.
  326   dnl However, when an operating system developer (on a platform which is not
  327   dnl yet known to gnulib) builds packages for their platform, they want to
  328   dnl expose, not hide, possible platform bugs; in this case,
  329   dnl --enable-cross-guesses=risky is the appropriate choice.
  330   dnl Sets the variables
  331   dnl gl_cross_guess_normal    (to be used when 'yes' is good and 'no' is bad),
  332   dnl gl_cross_guess_inverted  (to be used when 'no' is good and 'yes' is bad).
  333   AC_ARG_ENABLE([cross-guesses],
  334     [AS_HELP_STRING([--enable-cross-guesses={conservative|risky}],
  335        [specify policy for cross-compilation guesses])],
  336     [if test "x$enableval" != xconservative && test "x$enableval" != xrisky; then
  337        AC_MSG_WARN([invalid argument supplied to --enable-cross-guesses])
  338        enableval=conservative
  339      fi
  340      gl_cross_guesses="$enableval"],
  341     [gl_cross_guesses=conservative])
  342   if test $gl_cross_guesses = risky; then
  343     gl_cross_guess_normal="guessing yes"
  344     gl_cross_guess_inverted="guessing no"
  345   else
  346     gl_cross_guess_normal="guessing no"
  347     gl_cross_guess_inverted="guessing yes"
  348   fi
  349   dnl Preparation for running test programs:
  350   dnl Tell glibc to write diagnostics from -D_FORTIFY_SOURCE=2 to stderr, not
  351   dnl to /dev/tty, so they can be redirected to log files.  Such diagnostics
  352   dnl arise e.g., in the macros gl_PRINTF_DIRECTIVE_N, gl_SNPRINTF_DIRECTIVE_N.
  353   LIBC_FATAL_STDERR_=1
  354   export LIBC_FATAL_STDERR_
  355 ])
  356 
  357 # gl_MODULE_INDICATOR_CONDITION
  358 # expands to a C preprocessor expression that evaluates to 1 or 0, depending
  359 # whether a gnulib module that has been requested shall be considered present
  360 # or not.
  361 m4_define([gl_MODULE_INDICATOR_CONDITION], [1])
  362 
  363 # gl_MODULE_INDICATOR_SET_VARIABLE([modulename])
  364 # sets the shell variable that indicates the presence of the given module to
  365 # a C preprocessor expression that will evaluate to 1.
  366 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE],
  367 [
  368   gl_MODULE_INDICATOR_SET_VARIABLE_AUX(
  369     [GNULIB_[]m4_translit([[$1]],
  370                           [abcdefghijklmnopqrstuvwxyz./-],
  371                           [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])],
  372     [gl_MODULE_INDICATOR_CONDITION])
  373 ])
  374 
  375 # gl_MODULE_INDICATOR_SET_VARIABLE_AUX([variable])
  376 # modifies the shell variable to include the gl_MODULE_INDICATOR_CONDITION.
  377 # The shell variable's value is a C preprocessor expression that evaluates
  378 # to 0 or 1.
  379 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX],
  380 [
  381   m4_if(m4_defn([gl_MODULE_INDICATOR_CONDITION]), [1],
  382     [
  383      dnl Simplify the expression VALUE || 1 to 1.
  384      $1=1
  385     ],
  386     [gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([$1],
  387                                              [gl_MODULE_INDICATOR_CONDITION])])
  388 ])
  389 
  390 # gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([variable], [condition])
  391 # modifies the shell variable to include the given condition.  The shell
  392 # variable's value is a C preprocessor expression that evaluates to 0 or 1.
  393 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR],
  394 [
  395   dnl Simplify the expression 1 || CONDITION to 1.
  396   if test "$[]$1" != 1; then
  397     dnl Simplify the expression 0 || CONDITION to CONDITION.
  398     if test "$[]$1" = 0; then
  399       $1=$2
  400     else
  401       $1="($[]$1 || $2)"
  402     fi
  403   fi
  404 ])
  405 
  406 # gl_MODULE_INDICATOR([modulename])
  407 # defines a C macro indicating the presence of the given module
  408 # in a location where it can be used.
  409 #                                             |  Value  |   Value   |
  410 #                                             | in lib/ | in tests/ |
  411 # --------------------------------------------+---------+-----------+
  412 # Module present among main modules:          |    1    |     1     |
  413 # --------------------------------------------+---------+-----------+
  414 # Module present among tests-related modules: |    0    |     1     |
  415 # --------------------------------------------+---------+-----------+
  416 # Module not present at all:                  |    0    |     0     |
  417 # --------------------------------------------+---------+-----------+
  418 AC_DEFUN([gl_MODULE_INDICATOR],
  419 [
  420   AC_DEFINE_UNQUOTED([GNULIB_]m4_translit([[$1]],
  421       [abcdefghijklmnopqrstuvwxyz./-],
  422       [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]),
  423     [gl_MODULE_INDICATOR_CONDITION],
  424     [Define to a C preprocessor expression that evaluates to 1 or 0,
  425      depending whether the gnulib module $1 shall be considered present.])
  426 ])
  427 
  428 # gl_MODULE_INDICATOR_FOR_TESTS([modulename])
  429 # defines a C macro indicating the presence of the given module
  430 # in lib or tests. This is useful to determine whether the module
  431 # should be tested.
  432 #                                             |  Value  |   Value   |
  433 #                                             | in lib/ | in tests/ |
  434 # --------------------------------------------+---------+-----------+
  435 # Module present among main modules:          |    1    |     1     |
  436 # --------------------------------------------+---------+-----------+
  437 # Module present among tests-related modules: |    1    |     1     |
  438 # --------------------------------------------+---------+-----------+
  439 # Module not present at all:                  |    0    |     0     |
  440 # --------------------------------------------+---------+-----------+
  441 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS],
  442 [
  443   AC_DEFINE([GNULIB_TEST_]m4_translit([[$1]],
  444       [abcdefghijklmnopqrstuvwxyz./-],
  445       [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],
  446     [Define to 1 when the gnulib module $1 should be tested.])
  447 ])
  448 
  449 # gl_ASSERT_NO_GNULIB_POSIXCHECK
  450 # asserts that there will never be a need to #define GNULIB_POSIXCHECK.
  451 # and thereby enables an optimization of configure and config.h.
  452 # Used by Emacs.
  453 AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK],
  454 [
  455   dnl Override gl_WARN_ON_USE_PREPARE.
  456   dnl But hide this definition from 'aclocal'.
  457   AC_DEFUN([gl_W][ARN_ON_USE_PREPARE], [])
  458 ])
  459 
  460 # gl_ASSERT_NO_GNULIB_TESTS
  461 # asserts that there will be no gnulib tests in the scope of the configure.ac
  462 # and thereby enables an optimization of config.h.
  463 # Used by Emacs.
  464 AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS],
  465 [
  466   dnl Override gl_MODULE_INDICATOR_FOR_TESTS.
  467   AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], [])
  468 ])
  469 
  470 # Test whether <features.h> exists.
  471 # Set HAVE_FEATURES_H.
  472 AC_DEFUN([gl_FEATURES_H],
  473 [
  474   AC_CHECK_HEADERS_ONCE([features.h])
  475   if test $ac_cv_header_features_h = yes; then
  476     HAVE_FEATURES_H=1
  477   else
  478     HAVE_FEATURES_H=0
  479   fi
  480   AC_SUBST([HAVE_FEATURES_H])
  481 ])
  482 
  483 # gl_PROG_CC_C99
  484 # Modifies the value of the shell variable CC in an attempt to make $CC
  485 # understand ISO C99 source code.
  486 AC_DEFUN([gl_PROG_CC_C99],
  487 [
  488   dnl Just use AC_PROG_CC_C99.
  489   dnl When AC_PROG_CC_C99 and AC_PROG_CC_STDC are used together, the substituted
  490   dnl value of CC will contain the C99 enabling options twice. But this is only
  491   dnl a cosmetic problem.
  492   dnl With Autoconf >= 2.69c, use AC_PROG_CC since it implies AC_PROG_CC_C99;
  493   dnl this avoids a "warning: The macro `AC_PROG_CC_C99' is obsolete."
  494   m4_version_prereq([2.69c],
  495     [AC_REQUIRE([AC_PROG_CC])],
  496     [AC_REQUIRE([AC_PROG_CC_C99])])
  497 ])
  498 
  499 # gl_PROG_AR_RANLIB
  500 # Determines the values for AR, ARFLAGS, RANLIB that fit with the compiler.
  501 # The user can set the variables AR, ARFLAGS, RANLIB if he wants to override
  502 # the values.
  503 AC_DEFUN([gl_PROG_AR_RANLIB],
  504 [
  505   dnl Minix 3 comes with two toolchains: The Amsterdam Compiler Kit compiler
  506   dnl as "cc", and GCC as "gcc". They have different object file formats and
  507   dnl library formats. In particular, the GNU binutils programs ar and ranlib
  508   dnl produce libraries that work only with gcc, not with cc.
  509   AC_REQUIRE([AC_PROG_CC])
  510   dnl The '][' hides this use from 'aclocal'.
  511   AC_BEFORE([$0], [A][M_PROG_AR])
  512   AC_CACHE_CHECK([for Minix Amsterdam compiler], [gl_cv_c_amsterdam_compiler],
  513     [
  514       AC_EGREP_CPP([Amsterdam],
  515         [
  516 #ifdef __ACK__
  517 Amsterdam
  518 #endif
  519         ],
  520         [gl_cv_c_amsterdam_compiler=yes],
  521         [gl_cv_c_amsterdam_compiler=no])
  522     ])
  523 
  524   dnl Don't compete with AM_PROG_AR's decision about AR/ARFLAGS if we are not
  525   dnl building with __ACK__.
  526   if test $gl_cv_c_amsterdam_compiler = yes; then
  527     if test -z "$AR"; then
  528       AR='cc -c.a'
  529     fi
  530     if test -z "$ARFLAGS"; then
  531       ARFLAGS='-o'
  532     fi
  533   else
  534     dnl AM_PROG_AR was added in automake v1.11.2.  AM_PROG_AR does not AC_SUBST
  535     dnl ARFLAGS variable (it is filed into Makefile.in directly by automake
  536     dnl script on-demand, if not specified by ./configure of course).
  537     dnl Don't AC_REQUIRE the AM_PROG_AR otherwise the code for __ACK__ above
  538     dnl will be ignored.  Also, pay attention to call AM_PROG_AR in else block
  539     dnl because AM_PROG_AR is written so it could re-set AR variable even for
  540     dnl __ACK__.  It may seem like its easier to avoid calling the macro here,
  541     dnl but we need to AC_SUBST both AR/ARFLAGS (thus those must have some good
  542     dnl default value and automake should usually know them).
  543     dnl
  544     dnl The '][' hides this use from 'aclocal'.
  545     m4_ifdef([A][M_PROG_AR], [A][M_PROG_AR], [:])
  546   fi
  547 
  548   dnl In case the code above has not helped with setting AR/ARFLAGS, use
  549   dnl Automake-documented default values for AR and ARFLAGS, but prefer
  550   dnl ${host}-ar over ar (useful for cross-compiling).
  551   AC_CHECK_TOOL([AR], [ar], [ar])
  552   if test -z "$ARFLAGS"; then
  553     ARFLAGS='cr'
  554   fi
  555 
  556   AC_SUBST([AR])
  557   AC_SUBST([ARFLAGS])
  558   if test -z "$RANLIB"; then
  559     if test $gl_cv_c_amsterdam_compiler = yes; then
  560       RANLIB=':'
  561     else
  562       dnl Use the ranlib program if it is available.
  563       AC_PROG_RANLIB
  564     fi
  565   fi
  566   AC_SUBST([RANLIB])
  567 ])
  568 
  569 # AC_C_RESTRICT
  570 # This definition is copied from post-2.69 Autoconf and overrides the
  571 # AC_C_RESTRICT macro from autoconf 2.60..2.69.  It can be removed
  572 # once autoconf >= 2.70 can be assumed.  It's painful to check version
  573 # numbers, and in practice this macro is more up-to-date than Autoconf
  574 # is, so override Autoconf unconditionally.
  575 AC_DEFUN([AC_C_RESTRICT],
  576 [AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict],
  577   [ac_cv_c_restrict=no
  578    # The order here caters to the fact that C++ does not require restrict.
  579    for ac_kw in __restrict __restrict__ _Restrict restrict; do
  580      AC_COMPILE_IFELSE(
  581       [AC_LANG_PROGRAM(
  582          [[typedef int *int_ptr;
  583            int foo (int_ptr $ac_kw ip) { return ip[0]; }
  584            int bar (int [$ac_kw]); /* Catch GCC bug 14050.  */
  585            int bar (int ip[$ac_kw]) { return ip[0]; }
  586          ]],
  587          [[int s[1];
  588            int *$ac_kw t = s;
  589            t[0] = 0;
  590            return foo (t) + bar (t);
  591          ]])],
  592       [ac_cv_c_restrict=$ac_kw])
  593      test "$ac_cv_c_restrict" != no && break
  594    done
  595   ])
  596  AH_VERBATIM([restrict],
  597 [/* Define to the equivalent of the C99 'restrict' keyword, or to
  598    nothing if this is not supported.  Do not define if restrict is
  599    supported directly.  */
  600 #undef restrict
  601 /* Work around a bug in older versions of Sun C++, which did not
  602    #define __restrict__ or support _Restrict or __restrict__
  603    even though the corresponding Sun C compiler ended up with
  604    "#define restrict _Restrict" or "#define restrict __restrict__"
  605    in the previous line.  This workaround can be removed once
  606    we assume Oracle Developer Studio 12.5 (2016) or later.  */
  607 #if defined __SUNPRO_CC && !defined __RESTRICT && !defined __restrict__
  608 # define _Restrict
  609 # define __restrict__
  610 #endif])
  611  case $ac_cv_c_restrict in
  612    restrict) ;;
  613    no) AC_DEFINE([restrict], []) ;;
  614    *)  AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
  615  esac
  616 ])# AC_C_RESTRICT
  617 
  618 # gl_BIGENDIAN
  619 # is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd.
  620 # Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some
  621 # macros invoke AC_C_BIGENDIAN with arguments.
  622 AC_DEFUN([gl_BIGENDIAN],
  623 [
  624   AC_C_BIGENDIAN
  625 ])
  626 
  627 # A temporary file descriptor.
  628 # Must be less than 10, because dash 0.5.8 does not support redirections
  629 # with multi-digit file descriptors.
  630 m4_define([GL_TMP_FD], 9)
  631 
  632 # gl_SILENT(command)
  633 # executes command, but without the normal configure output.
  634 # This is useful when you want to invoke AC_CACHE_CHECK (or AC_CHECK_FUNC etc.)
  635 # inside another AC_CACHE_CHECK.
  636 AC_DEFUN([gl_SILENT],
  637 [
  638   exec GL_TMP_FD>&AS_MESSAGE_FD AS_MESSAGE_FD>/dev/null
  639   $1
  640   exec AS_MESSAGE_FD>&GL_TMP_FD GL_TMP_FD>&-
  641 ])
  642 
  643 # gl_CACHE_VAL_SILENT(cache-id, command-to-set-it)
  644 # is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not
  645 # output a spurious "(cached)" mark in the midst of other configure output.
  646 # This macro should be used instead of AC_CACHE_VAL when it is not surrounded
  647 # by an AC_MSG_CHECKING/AC_MSG_RESULT pair.
  648 AC_DEFUN([gl_CACHE_VAL_SILENT],
  649 [
  650   gl_SILENT([
  651     AC_CACHE_VAL([$1], [$2])
  652   ])
  653 ])
  654 
  655 dnl Expands to some code for use in .c programs that, on native Windows, defines
  656 dnl the Microsoft deprecated alias function names to the underscore-prefixed
  657 dnl actual function names. With this macro, these function names are available
  658 dnl without linking with '-loldnames' and without generating warnings.
  659 dnl Usage: Use it after all system header files are included.
  660 dnl          #include <...>
  661 dnl          #include <...>
  662 dnl          ]GL_MDA_DEFINES[
  663 dnl          ...
  664 AC_DEFUN([GL_MDA_DEFINES],[
  665 AC_REQUIRE([_GL_MDA_DEFINES])
  666 [$gl_mda_defines]
  667 ])
  668 AC_DEFUN([_GL_MDA_DEFINES],
  669 [gl_mda_defines='
  670 #if defined _WIN32 && !defined __CYGWIN__
  671 #define access    _access
  672 #define chdir     _chdir
  673 #define chmod     _chmod
  674 #define close     _close
  675 #define creat     _creat
  676 #define dup       _dup
  677 #define dup2      _dup2
  678 #define ecvt      _ecvt
  679 #define execl     _execl
  680 #define execle    _execle
  681 #define execlp    _execlp
  682 #define execv     _execv
  683 #define execve    _execve
  684 #define execvp    _execvp
  685 #define execvpe   _execvpe
  686 #define fcloseall _fcloseall
  687 #define fcvt      _fcvt
  688 #define fdopen    _fdopen
  689 #define fileno    _fileno
  690 #define gcvt      _gcvt
  691 #define getcwd    _getcwd
  692 #define getpid    _getpid
  693 #define getw      _getw
  694 #define isatty    _isatty
  695 #define j0        _j0
  696 #define j1        _j1
  697 #define jn        _jn
  698 #define lfind     _lfind
  699 #define lsearch   _lsearch
  700 #define lseek     _lseek
  701 #define memccpy   _memccpy
  702 #define mkdir     _mkdir
  703 #define mktemp    _mktemp
  704 #define open      _open
  705 #define putenv    _putenv
  706 #define putw      _putw
  707 #define read      _read
  708 #define rmdir     _rmdir
  709 #define strdup    _strdup
  710 #define swab      _swab
  711 #define tempnam   _tempnam
  712 #define tzset     _tzset
  713 #define umask     _umask
  714 #define unlink    _unlink
  715 #define utime     _utime
  716 #define wcsdup    _wcsdup
  717 #define write     _write
  718 #define y0        _y0
  719 #define y1        _y1
  720 #define yn        _yn
  721 #endif
  722 '
  723 ])