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newlib/config/stdint.m4
Paolo Bonzini 5baf5714af config: 
2007-04-11  Kai Tietz  <kai.tietz@onevision.com>

	* stdint.m4: Make template compatible with older cygwin
	types.h, wrapping each type in a __XXX_t_defined #ifdef.
2007-04-12 13:06:01 +00:00

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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"
])
])
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