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dnl @synopsis GCC_HEADER_STDINT [( HEADER-TO-GENERATE [, HEADERS-TO-CHECK])]

dnl

dnl the "ISO C9X: 7.18 Integer types <stdint.h>" section requires the

dnl existence of an include file <stdint.h> that defines a set of

dnl typedefs, especially uint8_t,int32_t,uintptr_t.

dnl Many older installations will not provide this file, but some will

dnl have the very same definitions in <inttypes.h>. In other enviroments

dnl we can use the inet-types in <sys/types.h> which would define the

dnl typedefs int8_t and u_int8_t respectivly.

dnl

dnl This macros will create a local "_stdint.h" or the headerfile given as

dnl an argument. In many cases that file will pick the definition from a

dnl "#include <stdint.h>" or "#include <inttypes.h>" statement, while

dnl in other environments it will provide the set of basic 'stdint's defined:

dnl int8_t,uint8_t,int16_t,uint16_t,int32_t,uint32_t,intptr_t,uintptr_t

dnl int_least32_t.. int_fast32_t.. intmax_t

dnl which may or may not rely on the definitions of other files.

dnl

dnl Sometimes the stdint.h or inttypes.h headers conflict with sys/types.h,

dnl so we test the headers together with sys/types.h and always include it

dnl into the generated header (to match the tests with the generated file).

dnl Hopefully this is not a big annoyance.

dnl

dnl If your installed header files require the stdint-types you will want to

dnl create an installable file mylib-int.h that all your other installable

dnl header may include. So, for a library package named "mylib", just use

dnl      GCC_HEADER_STDINT(mylib-int.h)

dnl in configure.in and install that header file in Makefile.am along with

dnl the other headers (mylib.h).  The mylib-specific headers can simply

dnl use "#include <mylib-int.h>" to obtain the stdint-types.

dnl

dnl Remember, if the system already had a valid <stdint.h>, the generated

dnl file will include it directly. No need for fuzzy HAVE_STDINT_H things...

dnl

dnl @author  Guido Draheim <guidod@gmx.de>, Paolo Bonzini <bonzini@gnu.org>

AC_DEFUN([GCC_HEADER_STDINT],

[m4_define(_GCC_STDINT_H, m4_ifval($1, $1, _stdint.h))

inttype_headers=`echo inttypes.h sys/inttypes.h $2 | sed -e 's/,/ /g'`

acx_cv_header_stdint=stddef.h

acx_cv_header_stdint_kind="(already complete)"

for i in stdint.h $inttype_headers; do

  unset ac_cv_type_uintptr_t

  unset ac_cv_type_uintmax_t

  unset ac_cv_type_int_least32_t

  unset ac_cv_type_int_fast32_t

  unset ac_cv_type_uint64_t

  _AS_ECHO_N([looking for a compliant stdint.h in $i, ])

  AC_CHECK_TYPE(uintmax_t,[acx_cv_header_stdint=$i],continue,[#include <sys/types.h>

#include <$i>])

  AC_CHECK_TYPE(uintptr_t,,[acx_cv_header_stdint_kind="(mostly complete)"], [#include <sys/types.h>

#include <$i>])

  AC_CHECK_TYPE(int_least32_t,,[acx_cv_header_stdint_kind="(mostly complete)"], [#include <sys/types.h>

#include <$i>])

  AC_CHECK_TYPE(int_fast32_t,,[acx_cv_header_stdint_kind="(mostly complete)"], [#include <sys/types.h>

#include <$i>])

  AC_CHECK_TYPE(uint64_t,,[acx_cv_header_stdint_kind="(lacks uint64_t)"], [#include <sys/types.h>

#include <$i>])

  break

done

if test "$acx_cv_header_stdint" = stddef.h; then

  acx_cv_header_stdint_kind="(lacks uintmax_t)"

  for i in stdint.h $inttype_headers; do

    unset ac_cv_type_uintptr_t

    unset ac_cv_type_uint32_t

    unset ac_cv_type_uint64_t

    _AS_ECHO_N([looking for an incomplete stdint.h in $i, ])

    AC_CHECK_TYPE(uint32_t,[acx_cv_header_stdint=$i],continue,[#include <sys/types.h>

#include <$i>])

    AC_CHECK_TYPE(uint64_t,,,[#include <sys/types.h>

#include <$i>])

    AC_CHECK_TYPE(uintptr_t,,,[#include <sys/types.h>

#include <$i>])

    break

  done

fi

if test "$acx_cv_header_stdint" = stddef.h; then

  acx_cv_header_stdint_kind="(u_intXX_t style)"

  for i in sys/types.h $inttype_headers; do

    unset ac_cv_type_u_int32_t

    unset ac_cv_type_u_int64_t

    _AS_ECHO_N([looking for u_intXX_t types in $i, ])

    AC_CHECK_TYPE(u_int32_t,[acx_cv_header_stdint=$i],continue,[#include <sys/types.h>

#include <$i>])

    AC_CHECK_TYPE(u_int64_t,,,[#include <sys/types.h>

#include <$i>])

    break

  done

fi

if test "$acx_cv_header_stdint" = stddef.h; then

  acx_cv_header_stdint_kind="(using manual detection)"

fi

test -z "$ac_cv_type_uintptr_t" && ac_cv_type_uintptr_t=no

test -z "$ac_cv_type_uint64_t" && ac_cv_type_uint64_t=no

test -z "$ac_cv_type_u_int64_t" && ac_cv_type_u_int64_t=no

test -z "$ac_cv_type_int_least32_t" && ac_cv_type_int_least32_t=no

test -z "$ac_cv_type_int_fast32_t" && ac_cv_type_int_fast32_t=no

# ----------------- Summarize what we found so far

AC_MSG_CHECKING([what to include in _GCC_STDINT_H])

case `AS_BASENAME(_GCC_STDINT_H)` in

  stdint.h) AC_MSG_WARN([are you sure you want it there?]) ;;

  inttypes.h) AC_MSG_WARN([are you sure you want it there?]) ;;

  *) ;;

esac

AC_MSG_RESULT($acx_cv_header_stdint $acx_cv_header_stdint_kind)

# ----------------- done included file, check C basic types --------

# Lacking an uintptr_t?  Test size of void *

case "$acx_cv_header_stdint:$ac_cv_type_uintptr_t" in

  stddef.h:* | *:no) AC_CHECK_SIZEOF(void *) ;;

esac

# Lacking an uint64_t?  Test size of long

case "$acx_cv_header_stdint:$ac_cv_type_uint64_t:$ac_cv_type_u_int64_t" in

  stddef.h:*:* | *:no:no) AC_CHECK_SIZEOF(long) ;;

esac

if test $acx_cv_header_stdint = stddef.h; then

  # Lacking a good header?  Test size of everything and deduce all types.

  AC_CHECK_SIZEOF(int)

  AC_CHECK_SIZEOF(short)

  AC_CHECK_SIZEOF(char)

  AC_MSG_CHECKING(for type equivalent to int8_t)

  case "$ac_cv_sizeof_char" in

    1) acx_cv_type_int8_t=char ;;

    *) AC_MSG_ERROR(no 8-bit type, please report a bug)

  esac

  AC_MSG_RESULT($acx_cv_type_int8_t)

  AC_MSG_CHECKING(for type equivalent to int16_t)

  case "$ac_cv_sizeof_int:$ac_cv_sizeof_short" in

    2:*) acx_cv_type_int16_t=int ;;

    *:2) acx_cv_type_int16_t=short ;;

    *) AC_MSG_ERROR(no 16-bit type, please report a bug)

  esac

  AC_MSG_RESULT($acx_cv_type_int16_t)

  AC_MSG_CHECKING(for type equivalent to int32_t)

  case "$ac_cv_sizeof_int:$ac_cv_sizeof_long" in

    4:*) acx_cv_type_int32_t=int ;;

    *:4) acx_cv_type_int32_t=long ;;

    *) AC_MSG_ERROR(no 32-bit type, please report a bug)

  esac

  AC_MSG_RESULT($acx_cv_type_int32_t)

fi

# These tests are here to make the output prettier

if test "$ac_cv_type_uint64_t" != yes && test "$ac_cv_type_u_int64_t" != yes; then

  case "$ac_cv_sizeof_long" in

    8) acx_cv_type_int64_t=long ;;

  esac

  AC_MSG_CHECKING(for type equivalent to int64_t)

  AC_MSG_RESULT(${acx_cv_type_int64_t-'using preprocessor symbols'})

fi

# Now we can use the above types

if test "$ac_cv_type_uintptr_t" != yes; then

  AC_MSG_CHECKING(for type equivalent to intptr_t)

  case $ac_cv_sizeof_void_p in

    2) acx_cv_type_intptr_t=int16_t ;;

    4) acx_cv_type_intptr_t=int32_t ;;

    8) acx_cv_type_intptr_t=int64_t ;;

    *) AC_MSG_ERROR(no equivalent for intptr_t, please report a bug)

  esac

  AC_MSG_RESULT($acx_cv_type_intptr_t)

fi

# ----------------- done all checks, emit header -------------

AC_CONFIG_COMMANDS(_GCC_STDINT_H, [

if test "$GCC" = yes; then

  echo "/* generated for " `$CC --version | sed 1q` "*/" > tmp-stdint.h

else

  echo "/* generated for $CC */" > tmp-stdint.h

fi

sed 's/^ *//' >> tmp-stdint.h <<EOF

  #ifndef GCC_GENERATED_STDINT_H

  #define GCC_GENERATED_STDINT_H 1

  #include <sys/types.h>

EOF

if test "$acx_cv_header_stdint" != stdint.h; then

  echo "#include <stddef.h>" >> tmp-stdint.h

fi

if test "$acx_cv_header_stdint" != stddef.h; then

  echo "#include <$acx_cv_header_stdint>" >> tmp-stdint.h

fi

sed 's/^ *//' >> tmp-stdint.h <<EOF

  /* glibc uses these symbols as guards to prevent redefinitions.  */

  #ifdef __int8_t_defined

  #define _INT8_T

  #define _INT16_T

  #define _INT32_T

  #endif

  #ifdef __uint32_t_defined

  #define _UINT32_T

  #endif

EOF

# ----------------- done header, emit basic int types -------------

if test "$acx_cv_header_stdint" = stddef.h; then

  sed 's/^ *//' >> tmp-stdint.h <<EOF

    #ifndef _UINT8_T

    #define _UINT8_T

    #ifndef __uint8_t_defined

    #define __uint8_t_defined

    typedef unsigned $acx_cv_type_int8_t uint8_t;

    #endif

    #endif

    #ifndef _UINT16_T

    #define _UINT16_T

    #ifndef __uint16_t_defined

    #define __uint16_t_defined

    typedef unsigned $acx_cv_type_int16_t uint16_t;

    #endif

    #endif

    #ifndef _UINT32_T

    #define _UINT32_T

    #ifndef __uint32_t_defined

    #define __uint32_t_defined

    typedef unsigned $acx_cv_type_int32_t uint32_t;

    #endif

    #endif

    #ifndef _INT8_T

    #define _INT8_T

    #ifndef __int8_t_defined

    #define __int8_t_defined

    typedef $acx_cv_type_int8_t int8_t;

    #endif

    #endif

    #ifndef _INT16_T

    #define _INT16_T

    #ifndef __int16_t_defined

    #define __int16_t_defined

    typedef $acx_cv_type_int16_t int16_t;

    #endif

    #endif

    #ifndef _INT32_T

    #define _INT32_T

    #ifndef __int32_t_defined

    #define __int32_t_defined

    typedef $acx_cv_type_int32_t int32_t;

    #endif

    #endif

EOF

elif test "$ac_cv_type_u_int32_t" = yes; then

  sed 's/^ *//' >> tmp-stdint.h <<EOF

    /* int8_t int16_t int32_t defined by inet code, we do the u_intXX types */

    #ifndef _INT8_T

    #define _INT8_T

    #endif

    #ifndef _INT16_T

    #define _INT16_T

    #endif

    #ifndef _INT32_T

    #define _INT32_T

    #endif

    #ifndef _UINT8_T

    #define _UINT8_T

    #ifndef __uint8_t_defined

    #define __uint8_t_defined

    typedef u_int8_t uint8_t;

    #endif

    #endif

    #ifndef _UINT16_T

    #define _UINT16_T

    #ifndef __uint16_t_defined

    #define __uint16_t_defined

    typedef u_int16_t uint16_t;

    #endif

    #endif

    #ifndef _UINT32_T

    #define _UINT32_T

    #ifndef __uint32_t_defined

    #define __uint32_t_defined

    typedef u_int32_t uint32_t;

    #endif

    #endif

EOF

else

  sed 's/^ *//' >> tmp-stdint.h <<EOF

    /* Some systems have guard macros to prevent redefinitions, define them.  */

    #ifndef _INT8_T

    #define _INT8_T

    #endif

    #ifndef _INT16_T

    #define _INT16_T

    #endif

    #ifndef _INT32_T

    #define _INT32_T

    #endif

    #ifndef _UINT8_T

    #define _UINT8_T

    #endif

    #ifndef _UINT16_T

    #define _UINT16_T

    #endif

    #ifndef _UINT32_T

    #define _UINT32_T

    #endif

EOF

fi

# ------------- done basic int types, emit int64_t types ------------

if test "$ac_cv_type_uint64_t" = yes; then

  sed 's/^ *//' >> tmp-stdint.h <<EOF

    /* system headers have good uint64_t and int64_t */

    #ifndef _INT64_T

    #define _INT64_T

    #endif

    #ifndef _UINT64_T

    #define _UINT64_T

    #endif

EOF

elif test "$ac_cv_type_u_int64_t" = yes; then

  sed 's/^ *//' >> tmp-stdint.h <<EOF

    /* system headers have an u_int64_t (and int64_t) */

    #ifndef _INT64_T

    #define _INT64_T

    #endif

    #ifndef _UINT64_T

    #define _UINT64_T

    #ifndef __uint64_t_defined

    #define __uint64_t_defined

    typedef u_int64_t uint64_t;

    #endif

    #endif

EOF

elif test -n "$acx_cv_type_int64_t"; then

  sed 's/^ *//' >> tmp-stdint.h <<EOF

    /* architecture has a 64-bit type, $acx_cv_type_int64_t */

    #ifndef _INT64_T

    #define _INT64_T

    typedef $acx_cv_type_int64_t int64_t;

    #endif

    #ifndef _UINT64_T

    #define _UINT64_T

    #ifndef __uint64_t_defined

    #define __uint64_t_defined

    typedef unsigned $acx_cv_type_int64_t uint64_t;

    #endif

    #endif

EOF

else

  sed 's/^ *//' >> tmp-stdint.h <<EOF

    /* some common heuristics for int64_t, using compiler-specific tests */

    #if defined __STDC_VERSION__ && (__STDC_VERSION__-0) >= 199901L

    #ifndef _INT64_T

    #define _INT64_T

    #ifndef __int64_t_defined

    typedef long long int64_t;

    #endif

    #endif

    #ifndef _UINT64_T

    #define _UINT64_T

    typedef unsigned long long uint64_t;

    #endif

    #elif defined __GNUC__ && defined (__STDC__) && __STDC__-0

    /* NextStep 2.0 cc is really gcc 1.93 but it defines __GNUC__ = 2 and

       does not implement __extension__.  But that compiler doesn't define

       __GNUC_MINOR__.  */

    # if __GNUC__ < 2 || (__NeXT__ && !__GNUC_MINOR__)

    # define __extension__

    # endif

    # ifndef _INT64_T

    # define _INT64_T

    __extension__ typedef long long int64_t;

    # endif

    # ifndef _UINT64_T

    # define _UINT64_T

    __extension__ typedef unsigned long long uint64_t;

    # endif

    #elif !defined __STRICT_ANSI__

    # if defined _MSC_VER || defined __WATCOMC__ || defined __BORLANDC__

    #  ifndef _INT64_T

    #  define _INT64_T

    typedef __int64 int64_t;

    #  endif

    #  ifndef _UINT64_T

    #  define _UINT64_T

    typedef unsigned __int64 uint64_t;

    #  endif

    # endif /* compiler */

    #endif /* ANSI version */

EOF

fi

# ------------- done int64_t types, emit intptr types ------------

if test "$ac_cv_type_uintptr_t" != yes; then

  sed 's/^ *//' >> tmp-stdint.h <<EOF

    /* Define intptr_t based on sizeof(void*) = $ac_cv_sizeof_void_p */

    #ifndef __uintptr_t_defined

    typedef u$acx_cv_type_intptr_t uintptr_t;

    #endif

    #ifndef __intptr_t_defined

    typedef $acx_cv_type_intptr_t  intptr_t;

    #endif

EOF

fi

# ------------- done intptr types, emit int_least types ------------

if test "$ac_cv_type_int_least32_t" != yes; then

  sed 's/^ *//' >> tmp-stdint.h <<EOF

    /* Define int_least types */

    typedef int8_t     int_least8_t;

    typedef int16_t    int_least16_t;

    typedef int32_t    int_least32_t;

    #ifdef _INT64_T

    typedef int64_t    int_least64_t;

    #endif

    typedef uint8_t    uint_least8_t;

    typedef uint16_t   uint_least16_t;

    typedef uint32_t   uint_least32_t;

    #ifdef _UINT64_T

    typedef uint64_t   uint_least64_t;

    #endif

EOF

fi

# ------------- done intptr types, emit int_fast types ------------

if test "$ac_cv_type_int_fast32_t" != yes; then

  dnl NOTE: The following code assumes that sizeof (int) > 1.

  dnl Fix when strange machines are reported.

  sed 's/^ *//' >> tmp-stdint.h <<EOF

    /* Define int_fast types.  short is often slow */

    typedef int8_t       int_fast8_t;

    typedef int          int_fast16_t;

    typedef int32_t      int_fast32_t;

    #ifdef _INT64_T

    typedef int64_t      int_fast64_t;

    #endif

    typedef uint8_t      uint_fast8_t;

    typedef unsigned int uint_fast16_t;

    typedef uint32_t     uint_fast32_t;

    #ifdef _UINT64_T

    typedef uint64_t     uint_fast64_t;

    #endif

EOF

fi

if test "$ac_cv_type_uintmax_t" != yes; then

  sed 's/^ *//' >> tmp-stdint.h <<EOF

    /* Define intmax based on what we found */

    #ifdef _INT64_T

    typedef int64_t       intmax_t;

    #else

    typedef long          intmax_t;

    #endif

    #ifdef _UINT64_T

    typedef uint64_t      uintmax_t;

    #else

    typedef unsigned long uintmax_t;

    #endif

EOF

fi

sed 's/^ *//' >> tmp-stdint.h <<EOF

  #endif /* GCC_GENERATED_STDINT_H */

EOF

if test -r ]_GCC_STDINT_H[ && cmp -s tmp-stdint.h ]_GCC_STDINT_H[; then

  rm -f tmp-stdint.h

else

  mv -f tmp-stdint.h ]_GCC_STDINT_H[

fi

], [

GCC="$GCC"

CC="$CC"

acx_cv_header_stdint="$acx_cv_header_stdint"

acx_cv_type_int8_t="$acx_cv_type_int8_t"

acx_cv_type_int16_t="$acx_cv_type_int16_t"

acx_cv_type_int32_t="$acx_cv_type_int32_t"

acx_cv_type_int64_t="$acx_cv_type_int64_t"

acx_cv_type_intptr_t="$acx_cv_type_intptr_t"

ac_cv_type_uintmax_t="$ac_cv_type_uintmax_t"

ac_cv_type_uintptr_t="$ac_cv_type_uintptr_t"

ac_cv_type_uint64_t="$ac_cv_type_uint64_t"

ac_cv_type_u_int64_t="$ac_cv_type_u_int64_t"

ac_cv_type_u_int32_t="$ac_cv_type_u_int32_t"

ac_cv_type_int_least32_t="$ac_cv_type_int_least32_t"

ac_cv_type_int_fast32_t="$ac_cv_type_int_fast32_t"

ac_cv_sizeof_void_p="$ac_cv_sizeof_void_p"

])

])