m4/inttypes.m4

   1 # inttypes.m4 serial 26
   2 dnl Copyright (C) 2006-2014 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 dnl From Derek Price, Bruno Haible.
   8 dnl Test whether <inttypes.h> is supported or must be substituted.
   9
  10 AC_DEFUN([gl_INTTYPES_H],
  11 [
  12   AC_REQUIRE([gl_INTTYPES_INCOMPLETE])
  13   gl_INTTYPES_PRI_SCN
  14 ])
  15
  16 AC_DEFUN_ONCE([gl_INTTYPES_INCOMPLETE],
  17 [
  18   AC_REQUIRE([gl_STDINT_H])
  19   AC_CHECK_HEADERS_ONCE([inttypes.h])
  20
  21   dnl Override <inttypes.h> always, so that the portability warnings work.
  22   AC_REQUIRE([gl_INTTYPES_H_DEFAULTS])
  23   gl_CHECK_NEXT_HEADERS([inttypes.h])
  24
  25   AC_REQUIRE([gl_MULTIARCH])
  26
  27   dnl Check for declarations of anything we want to poison if the
  28   dnl corresponding gnulib module is not in use.
  29   gl_WARN_ON_USE_PREPARE([[#include <inttypes.h>
  30     ]], [imaxabs imaxdiv strtoimax strtoumax])
  31 ])
  32
  33 # Ensure that the PRI* and SCN* macros are defined appropriately.
  34 AC_DEFUN([gl_INTTYPES_PRI_SCN],
  35 [
  36   AC_REQUIRE([gt_INTTYPES_PRI])
  37
  38   PRIPTR_PREFIX=
  39   if test -n "$STDINT_H"; then
  40     dnl Using the gnulib <stdint.h>. It always defines intptr_t to 'long'.
  41     PRIPTR_PREFIX='"l"'
  42   else
  43     dnl Using the system's <stdint.h>.
  44     for glpfx in '' l ll I64; do
  45       case $glpfx in
  46         '')  gltype1='int';;
  47         l)   gltype1='long int';;
  48         ll)  gltype1='long long int';;
  49         I64) gltype1='__int64';;
  50       esac
  51       AC_COMPILE_IFELSE(
  52         [AC_LANG_PROGRAM([[#include <stdint.h>
  53            extern intptr_t foo;
  54            extern $gltype1 foo;]])],
  55         [PRIPTR_PREFIX='"'$glpfx'"'])
  56       test -n "$PRIPTR_PREFIX" && break
  57     done
  58   fi
  59   AC_SUBST([PRIPTR_PREFIX])
  60
  61   gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
  62     [INT32_MAX_LT_INTMAX_MAX],
  63     [defined INT32_MAX && defined INTMAX_MAX],
  64     [INT32_MAX < INTMAX_MAX],
  65     [sizeof (int) < sizeof (long long int)])
  66   if test $APPLE_UNIVERSAL_BUILD = 0; then
  67     gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
  68       [INT64_MAX_EQ_LONG_MAX],
  69       [defined INT64_MAX],
  70       [INT64_MAX == LONG_MAX],
  71       [sizeof (long long int) == sizeof (long int)])
  72   else
  73     INT64_MAX_EQ_LONG_MAX=-1
  74   fi
  75   gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
  76     [UINT32_MAX_LT_UINTMAX_MAX],
  77     [defined UINT32_MAX && defined UINTMAX_MAX],
  78     [UINT32_MAX < UINTMAX_MAX],
  79     [sizeof (unsigned int) < sizeof (unsigned long long int)])
  80   if test $APPLE_UNIVERSAL_BUILD = 0; then
  81     gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
  82       [UINT64_MAX_EQ_ULONG_MAX],
  83       [defined UINT64_MAX],
  84       [UINT64_MAX == ULONG_MAX],
  85       [sizeof (unsigned long long int) == sizeof (unsigned long int)])
  86   else
  87     UINT64_MAX_EQ_ULONG_MAX=-1
  88   fi
  89 ])
  90
  91 # Define the symbol $1 to be 1 if the condition is true, 0 otherwise.
  92 # If $2 is true, the condition is $3; otherwise if long long int is supported
  93 # approximate the condition with $4; otherwise, assume the condition is false.
  94 # The condition should work on all C99 platforms; the approximations should be
  95 # good enough to work on all practical pre-C99 platforms.
  96 # $2 is evaluated by the C preprocessor, $3 and $4 as compile-time constants.
  97 AC_DEFUN([gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION],
  98 [
  99   AC_CACHE_CHECK([whether $3],
 100     [gl_cv_test_$1],
 101     [AC_COMPILE_IFELSE(
 102        [AC_LANG_PROGRAM(
 103           [[/* Work also in C++ mode.  */
 104             #define __STDC_LIMIT_MACROS 1
 105
 106             /* Work if build is not clean.  */
 107             #define _GL_JUST_INCLUDE_SYSTEM_STDINT_H
 108
 109             #include <limits.h>
 110             #if HAVE_STDINT_H
 111              #include <stdint.h>
 112             #endif
 113
 114             #if $2
 115              #define CONDITION ($3)
 116             #elif HAVE_LONG_LONG_INT
 117              #define CONDITION ($4)
 118             #else
 119              #define CONDITION 0
 120             #endif
 121             int test[CONDITION ? 1 : -1];]])],
 122        [gl_cv_test_$1=yes],
 123        [gl_cv_test_$1=no])])
 124   if test $gl_cv_test_$1 = yes; then
 125     $1=1;
 126   else
 127     $1=0;
 128   fi
 129   AC_SUBST([$1])
 130 ])
 131
 132 AC_DEFUN([gl_INTTYPES_MODULE_INDICATOR],
 133 [
 134   dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
 135   AC_REQUIRE([gl_INTTYPES_H_DEFAULTS])
 136   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
 137 ])
 138
 139 AC_DEFUN([gl_INTTYPES_H_DEFAULTS],
 140 [
 141   GNULIB_IMAXABS=0;      AC_SUBST([GNULIB_IMAXABS])
 142   GNULIB_IMAXDIV=0;      AC_SUBST([GNULIB_IMAXDIV])
 143   GNULIB_STRTOIMAX=0;    AC_SUBST([GNULIB_STRTOIMAX])
 144   GNULIB_STRTOUMAX=0;    AC_SUBST([GNULIB_STRTOUMAX])
 145   dnl Assume proper GNU behavior unless another module says otherwise.
 146   HAVE_DECL_IMAXABS=1;   AC_SUBST([HAVE_DECL_IMAXABS])
 147   HAVE_DECL_IMAXDIV=1;   AC_SUBST([HAVE_DECL_IMAXDIV])
 148   HAVE_DECL_STRTOIMAX=1; AC_SUBST([HAVE_DECL_STRTOIMAX])
 149   HAVE_DECL_STRTOUMAX=1; AC_SUBST([HAVE_DECL_STRTOUMAX])
 150   REPLACE_STRTOIMAX=0;   AC_SUBST([REPLACE_STRTOIMAX])
 151   REPLACE_STRTOUMAX=0;   AC_SUBST([REPLACE_STRTOUMAX])
 152   INT32_MAX_LT_INTMAX_MAX=1;  AC_SUBST([INT32_MAX_LT_INTMAX_MAX])
 153   INT64_MAX_EQ_LONG_MAX='defined _LP64';  AC_SUBST([INT64_MAX_EQ_LONG_MAX])
 154   PRI_MACROS_BROKEN=0;   AC_SUBST([PRI_MACROS_BROKEN])
 155   PRIPTR_PREFIX=__PRIPTR_PREFIX;  AC_SUBST([PRIPTR_PREFIX])
 156   UINT32_MAX_LT_UINTMAX_MAX=1;  AC_SUBST([UINT32_MAX_LT_UINTMAX_MAX])
 157   UINT64_MAX_EQ_ULONG_MAX='defined _LP64';  AC_SUBST([UINT64_MAX_EQ_ULONG_MAX])
 158 ])