m4/inttypes.m4

   1 # inttypes.m4 serial 23
   2 dnl Copyright (C) 2006-2011 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([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 Ensure that <stdint.h> defines the limit macros, since gnulib's
  28   dnl <inttypes.h> relies on them.  This macro is only needed when a
  29   dnl C++ compiler is in use; it has no effect for a C compiler.
  30   dnl Also be careful to define __STDC_LIMIT_MACROS only when gnulib's
  31   dnl <inttypes.h> is going to be created, and to avoid redefinition warnings
  32   dnl if the __STDC_LIMIT_MACROS is already defined through the CPPFLAGS.
  33   AC_DEFINE([GL_TRIGGER_STDC_LIMIT_MACROS], [1],
  34     [Define to make the limit macros in <stdint.h> visible.])
  35   AH_VERBATIM([__STDC_LIMIT_MACROS_ZZZ],
  36 [/* Ensure that <stdint.h> defines the limit macros, since gnulib's
  37    <inttypes.h> relies on them.  */
  38 #if defined __cplusplus && !defined __STDC_LIMIT_MACROS && GL_TRIGGER_STDC_LIMIT_MACROS
  39 # define __STDC_LIMIT_MACROS 1
  40 #endif
  41 ])
  42
  43   dnl Check for declarations of anything we want to poison if the
  44   dnl corresponding gnulib module is not in use.
  45   gl_WARN_ON_USE_PREPARE([[#include <inttypes.h>
  46     ]], [imaxabs imaxdiv strtoimax strtoumax])
  47 ])
  48
  49 # Ensure that the PRI* and SCN* macros are defined appropriately.
  50 AC_DEFUN([gl_INTTYPES_PRI_SCN],
  51 [
  52   AC_REQUIRE([gt_INTTYPES_PRI])
  53
  54   PRIPTR_PREFIX=
  55   if test -n "$STDINT_H"; then
  56     dnl Using the gnulib <stdint.h>. It always defines intptr_t to 'long'.
  57     PRIPTR_PREFIX='"l"'
  58   else
  59     dnl Using the system's <stdint.h>.
  60     for glpfx in '' l ll I64; do
  61       case $glpfx in
  62         '')  gltype1='int';;
  63         l)   gltype1='long int';;
  64         ll)  gltype1='long long int';;
  65         I64) gltype1='__int64';;
  66       esac
  67       AC_COMPILE_IFELSE(
  68         [AC_LANG_PROGRAM([[#include <stdint.h>
  69            extern intptr_t foo;
  70            extern $gltype1 foo;]])],
  71         [PRIPTR_PREFIX='"'$glpfx'"'])
  72       test -n "$PRIPTR_PREFIX" && break
  73     done
  74   fi
  75   AC_SUBST([PRIPTR_PREFIX])
  76
  77   gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
  78     [INT32_MAX_LT_INTMAX_MAX],
  79     [defined INT32_MAX && defined INTMAX_MAX],
  80     [INT32_MAX < INTMAX_MAX],
  81     [sizeof (int) < sizeof (long long int)])
  82   if test $APPLE_UNIVERSAL_BUILD = 0; then
  83     gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
  84       [INT64_MAX_EQ_LONG_MAX],
  85       [defined INT64_MAX],
  86       [INT64_MAX == LONG_MAX],
  87       [sizeof (long long int) == sizeof (long int)])
  88   else
  89     INT64_MAX_EQ_LONG_MAX=-1
  90   fi
  91   gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
  92     [UINT32_MAX_LT_UINTMAX_MAX],
  93     [defined UINT32_MAX && defined UINTMAX_MAX],
  94     [UINT32_MAX < UINTMAX_MAX],
  95     [sizeof (unsigned int) < sizeof (unsigned long long int)])
  96   if test $APPLE_UNIVERSAL_BUILD = 0; then
  97     gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
  98       [UINT64_MAX_EQ_ULONG_MAX],
  99       [defined UINT64_MAX],
 100       [UINT64_MAX == ULONG_MAX],
 101       [sizeof (unsigned long long int) == sizeof (unsigned long int)])
 102   else
 103     UINT64_MAX_EQ_ULONG_MAX=-1
 104   fi
 105 ])
 106
 107 # Define the symbol $1 to be 1 if the condition is true, 0 otherwise.
 108 # If $2 is true, the condition is $3; otherwise if long long int is supported
 109 # approximate the condition with $4; otherwise, assume the condition is false.
 110 # The condition should work on all C99 platforms; the approximations should be
 111 # good enough to work on all practical pre-C99 platforms.
 112 # $2 is evaluated by the C preprocessor, $3 and $4 as compile-time constants.
 113 AC_DEFUN([gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION],
 114 [
 115   AC_CACHE_CHECK([whether $3],
 116     [gl_cv_test_$1],
 117     [AC_COMPILE_IFELSE(
 118        [AC_LANG_PROGRAM(
 119           [[/* Work also in C++ mode.  */
 120             #define __STDC_LIMIT_MACROS 1
 121
 122             /* Work if build is not clean.  */
 123             #define _GL_JUST_INCLUDE_SYSTEM_STDINT_H
 124
 125             #include <limits.h>
 126             #if HAVE_STDINT_H
 127              #include <stdint.h>
 128             #endif
 129
 130             #if $2
 131              #define CONDITION ($3)
 132             #elif HAVE_LONG_LONG_INT
 133              #define CONDITION ($4)
 134             #else
 135              #define CONDITION 0
 136             #endif
 137             int test[CONDITION ? 1 : -1];]])],
 138        [gl_cv_test_$1=yes],
 139        [gl_cv_test_$1=no])])
 140   if test $gl_cv_test_$1 = yes; then
 141     $1=1;
 142   else
 143     $1=0;
 144   fi
 145   AC_SUBST([$1])
 146 ])
 147
 148 AC_DEFUN([gl_INTTYPES_MODULE_INDICATOR],
 149 [
 150   dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
 151   AC_REQUIRE([gl_INTTYPES_H_DEFAULTS])
 152   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
 153 ])
 154
 155 AC_DEFUN([gl_INTTYPES_H_DEFAULTS],
 156 [
 157   GNULIB_IMAXABS=0;      AC_SUBST([GNULIB_IMAXABS])
 158   GNULIB_IMAXDIV=0;      AC_SUBST([GNULIB_IMAXDIV])
 159   GNULIB_STRTOIMAX=0;    AC_SUBST([GNULIB_STRTOIMAX])
 160   GNULIB_STRTOUMAX=0;    AC_SUBST([GNULIB_STRTOUMAX])
 161   dnl Assume proper GNU behavior unless another module says otherwise.
 162   HAVE_DECL_IMAXABS=1;   AC_SUBST([HAVE_DECL_IMAXABS])
 163   HAVE_DECL_IMAXDIV=1;   AC_SUBST([HAVE_DECL_IMAXDIV])
 164   HAVE_DECL_STRTOIMAX=1; AC_SUBST([HAVE_DECL_STRTOIMAX])
 165   HAVE_DECL_STRTOUMAX=1; AC_SUBST([HAVE_DECL_STRTOUMAX])
 166   INT32_MAX_LT_INTMAX_MAX=1;  AC_SUBST([INT32_MAX_LT_INTMAX_MAX])
 167   INT64_MAX_EQ_LONG_MAX='defined _LP64';  AC_SUBST([INT64_MAX_EQ_LONG_MAX])
 168   PRI_MACROS_BROKEN=0;   AC_SUBST([PRI_MACROS_BROKEN])
 169   PRIPTR_PREFIX=__PRIPTR_PREFIX;  AC_SUBST([PRIPTR_PREFIX])
 170   UINT32_MAX_LT_UINTMAX_MAX=1;  AC_SUBST([UINT32_MAX_LT_UINTMAX_MAX])
 171   UINT64_MAX_EQ_ULONG_MAX='defined _LP64';  AC_SUBST([UINT64_MAX_EQ_ULONG_MAX])
 172 ])