config/stdint.m4

   1 dnl @synopsis GCC_HEADER_STDINT [( HEADER-TO-GENERATE [, HEADERS-TO-CHECK])]
   2 dnl
   3 dnl the "ISO C9X: 7.18 Integer types <stdint.h>" section requires the
   4 dnl existence of an include file <stdint.h> that defines a set of
   5 dnl typedefs, especially uint8_t,int32_t,uintptr_t.
   6 dnl Many older installations will not provide this file, but some will
   7 dnl have the very same definitions in <inttypes.h>. In other enviroments
   8 dnl we can use the inet-types in <sys/types.h> which would define the
   9 dnl typedefs int8_t and u_int8_t respectivly.
  10 dnl
  11 dnl This macros will create a local "_stdint.h" or the headerfile given as
  12 dnl an argument. In many cases that file will pick the definition from a
  13 dnl "#include <stdint.h>" or "#include <inttypes.h>" statement, while
  14 dnl in other environments it will provide the set of basic 'stdint's defined:
  15 dnl int8_t,uint8_t,int16_t,uint16_t,int32_t,uint32_t,intptr_t,uintptr_t
  16 dnl int_least32_t.. int_fast32_t.. intmax_t
  17 dnl which may or may not rely on the definitions of other files.
  18 dnl
  19 dnl Sometimes the stdint.h or inttypes.h headers conflict with sys/types.h,
  20 dnl so we test the headers together with sys/types.h and always include it
  21 dnl into the generated header (to match the tests with the generated file).
  22 dnl Hopefully this is not a big annoyance.
  23 dnl
  24 dnl If your installed header files require the stdint-types you will want to
  25 dnl create an installable file mylib-int.h that all your other installable
  26 dnl header may include. So, for a library package named "mylib", just use
  27 dnl      GCC_HEADER_STDINT(mylib-int.h)
  28 dnl in configure.in and install that header file in Makefile.am along with
  29 dnl the other headers (mylib.h).  The mylib-specific headers can simply
  30 dnl use "#include <mylib-int.h>" to obtain the stdint-types.
  31 dnl
  32 dnl Remember, if the system already had a valid <stdint.h>, the generated
  33 dnl file will include it directly. No need for fuzzy HAVE_STDINT_H things...
  34 dnl
  35 dnl @author  Guido Draheim <guidod@gmx.de>, Paolo Bonzini <bonzini@gnu.org>
  36
  37 AC_DEFUN([GCC_HEADER_STDINT],
  38 [m4_define(_GCC_STDINT_H, m4_ifval($1, $1, _stdint.h))
  39
  40 inttype_headers=`echo inttypes.h sys/inttypes.h $2 | sed -e 's/,/ /g'`
  41
  42 acx_cv_header_stdint=stddef.h
  43 acx_cv_header_stdint_kind="(already complete)"
  44 for i in stdint.h $inttype_headers; do
  45   unset ac_cv_type_uintptr_t
  46   unset ac_cv_type_uintmax_t
  47   unset ac_cv_type_int_least32_t
  48   unset ac_cv_type_int_fast32_t
  49   unset ac_cv_type_uint64_t
  50   _AS_ECHO_N([looking for a compliant stdint.h in $i, ])
  51   AC_CHECK_TYPE(uintmax_t,[acx_cv_header_stdint=$i],continue,[#include <sys/types.h>
  52 #include <$i>])
  53   AC_CHECK_TYPE(uintptr_t,,[acx_cv_header_stdint_kind="(mostly complete)"], [#include <sys/types.h>
  54 #include <$i>])
  55   AC_CHECK_TYPE(int_least32_t,,[acx_cv_header_stdint_kind="(mostly complete)"], [#include <sys/types.h>
  56 #include <$i>])
  57   AC_CHECK_TYPE(int_fast32_t,,[acx_cv_header_stdint_kind="(mostly complete)"], [#include <sys/types.h>
  58 #include <$i>])
  59   AC_CHECK_TYPE(uint64_t,,[acx_cv_header_stdint_kind="(lacks uint64_t)"], [#include <sys/types.h>
  60 #include <$i>])
  61   break
  62 done
  63 if test "$acx_cv_header_stdint" = stddef.h; then
  64   acx_cv_header_stdint_kind="(lacks uintmax_t)"
  65   for i in stdint.h $inttype_headers; do
  66     unset ac_cv_type_uintptr_t
  67     unset ac_cv_type_uint32_t
  68     unset ac_cv_type_uint64_t
  69     _AS_ECHO_N([looking for an incomplete stdint.h in $i, ])
  70     AC_CHECK_TYPE(uint32_t,[acx_cv_header_stdint=$i],continue,[#include <sys/types.h>
  71 #include <$i>])
  72     AC_CHECK_TYPE(uint64_t,,,[#include <sys/types.h>
  73 #include <$i>])
  74     AC_CHECK_TYPE(uintptr_t,,,[#include <sys/types.h>
  75 #include <$i>])
  76     break
  77   done
  78 fi
  79 if test "$acx_cv_header_stdint" = stddef.h; then
  80   acx_cv_header_stdint_kind="(u_intXX_t style)"
  81   for i in sys/types.h $inttype_headers; do
  82     unset ac_cv_type_u_int32_t
  83     unset ac_cv_type_u_int64_t
  84     _AS_ECHO_N([looking for u_intXX_t types in $i, ])
  85     AC_CHECK_TYPE(u_int32_t,[acx_cv_header_stdint=$i],continue,[#include <sys/types.h>
  86 #include <$i>])
  87     AC_CHECK_TYPE(u_int64_t,,,[#include <sys/types.h>
  88 #include <$i>])
  89     break
  90   done
  91 fi
  92 if test "$acx_cv_header_stdint" = stddef.h; then
  93   acx_cv_header_stdint_kind="(using manual detection)"
  94 fi
  95
  96 test -z "$ac_cv_type_uintptr_t" && ac_cv_type_uintptr_t=no
  97 test -z "$ac_cv_type_uint64_t" && ac_cv_type_uint64_t=no
  98 test -z "$ac_cv_type_u_int64_t" && ac_cv_type_u_int64_t=no
  99 test -z "$ac_cv_type_int_least32_t" && ac_cv_type_int_least32_t=no
 100 test -z "$ac_cv_type_int_fast32_t" && ac_cv_type_int_fast32_t=no
 101
 102 # ----------------- Summarize what we found so far
 103
 104 AC_MSG_CHECKING([what to include in _GCC_STDINT_H])
 105
 106 case `AS_BASENAME(_GCC_STDINT_H)` in
 107   stdint.h) AC_MSG_WARN([are you sure you want it there?]) ;;
 108   inttypes.h) AC_MSG_WARN([are you sure you want it there?]) ;;
 109   *) ;;
 110 esac
 111
 112 AC_MSG_RESULT($acx_cv_header_stdint $acx_cv_header_stdint_kind)
 113
 114 # ----------------- done included file, check C basic types --------
 115
 116 # Lacking an uintptr_t?  Test size of void *
 117 case "$acx_cv_header_stdint:$ac_cv_type_uintptr_t" in
 118   stddef.h:* | *:no) AC_CHECK_SIZEOF(void *) ;;
 119 esac
 120
 121 # Lacking an uint64_t?  Test size of long
 122 case "$acx_cv_header_stdint:$ac_cv_type_uint64_t:$ac_cv_type_u_int64_t" in
 123   stddef.h:*:* | *:no:no) AC_CHECK_SIZEOF(long) ;;
 124 esac
 125
 126 if test $acx_cv_header_stdint = stddef.h; then
 127   # Lacking a good header?  Test size of everything and deduce all types.
 128   AC_CHECK_SIZEOF(int)
 129   AC_CHECK_SIZEOF(short)
 130   AC_CHECK_SIZEOF(char)
 131
 132   AC_MSG_CHECKING(for type equivalent to int8_t)
 133   case "$ac_cv_sizeof_char" in
 134     1) acx_cv_type_int8_t=char ;;
 135     *) AC_MSG_ERROR(no 8-bit type, please report a bug)
 136   esac
 137   AC_MSG_RESULT($acx_cv_type_int8_t)
 138
 139   AC_MSG_CHECKING(for type equivalent to int16_t)
 140   case "$ac_cv_sizeof_int:$ac_cv_sizeof_short" in
 141     2:*) acx_cv_type_int16_t=int ;;
 142     *:2) acx_cv_type_int16_t=short ;;
 143     *) AC_MSG_ERROR(no 16-bit type, please report a bug)
 144   esac
 145   AC_MSG_RESULT($acx_cv_type_int16_t)
 146
 147   AC_MSG_CHECKING(for type equivalent to int32_t)
 148   case "$ac_cv_sizeof_int:$ac_cv_sizeof_long" in
 149     4:*) acx_cv_type_int32_t=int ;;
 150     *:4) acx_cv_type_int32_t=long ;;
 151     *) AC_MSG_ERROR(no 32-bit type, please report a bug)
 152   esac
 153   AC_MSG_RESULT($acx_cv_type_int32_t)
 154 fi
 155
 156 # These tests are here to make the output prettier
 157
 158 if test "$ac_cv_type_uint64_t" != yes && test "$ac_cv_type_u_int64_t" != yes; then
 159   case "$ac_cv_sizeof_long" in
 160     8) acx_cv_type_int64_t=long ;;
 161   esac
 162   AC_MSG_CHECKING(for type equivalent to int64_t)
 163   AC_MSG_RESULT(${acx_cv_type_int64_t-'using preprocessor symbols'})
 164 fi
 165
 166 # Now we can use the above types
 167
 168 if test "$ac_cv_type_uintptr_t" != yes; then
 169   AC_MSG_CHECKING(for type equivalent to intptr_t)
 170   case $ac_cv_sizeof_void_p in
 171     2) acx_cv_type_intptr_t=int16_t ;;
 172     4) acx_cv_type_intptr_t=int32_t ;;
 173     8) acx_cv_type_intptr_t=int64_t ;;
 174     *) AC_MSG_ERROR(no equivalent for intptr_t, please report a bug)
 175   esac
 176   AC_MSG_RESULT($acx_cv_type_intptr_t)
 177 fi
 178
 179 # ----------------- done all checks, emit header -------------
 180 AC_CONFIG_COMMANDS(_GCC_STDINT_H, [
 181 if test "$GCC" = yes; then
 182   echo "/* generated for " `$CC --version | sed 1q` "*/" > tmp-stdint.h
 183 else
 184   echo "/* generated for $CC */" > tmp-stdint.h
 185 fi
 186
 187 sed 's/^ *//' >> tmp-stdint.h <<EOF
 188
 189   #ifndef GCC_GENERATED_STDINT_H
 190   #define GCC_GENERATED_STDINT_H 1
 191
 192   #include <sys/types.h>
 193 EOF
 194
 195 if test "$acx_cv_header_stdint" != stdint.h; then
 196   echo "#include <stddef.h>" >> tmp-stdint.h
 197 fi
 198 if test "$acx_cv_header_stdint" != stddef.h; then
 199   echo "#include <$acx_cv_header_stdint>" >> tmp-stdint.h
 200 fi
 201
 202 sed 's/^ *//' >> tmp-stdint.h <<EOF
 203   /* glibc uses these symbols as guards to prevent redefinitions.  */
 204   #ifdef __int8_t_defined
 205   #define _INT8_T
 206   #define _INT16_T
 207   #define _INT32_T
 208   #endif
 209   #ifdef __uint32_t_defined
 210   #define _UINT32_T
 211   #endif
 212
 213 EOF
 214
 215 # ----------------- done header, emit basic int types -------------
 216 if test "$acx_cv_header_stdint" = stddef.h; then
 217   sed 's/^ *//' >> tmp-stdint.h <<EOF
 218
 219     #ifndef _UINT8_T
 220     #define _UINT8_T
 221     typedef unsigned $acx_cv_type_int8_t uint8_t;
 222     #endif
 223
 224     #ifndef _UINT16_T
 225     #define _UINT16_T
 226     typedef unsigned $acx_cv_type_int16_t uint16_t;
 227     #endif
 228
 229     #ifndef _UINT32_T
 230     #define _UINT32_T
 231     typedef unsigned $acx_cv_type_int32_t uint32_t;
 232     #endif
 233
 234     #ifndef _INT8_T
 235     #define _INT8_T
 236     typedef $acx_cv_type_int8_t int8_t;
 237     #endif
 238
 239     #ifndef _INT16_T
 240     #define _INT16_T
 241     typedef $acx_cv_type_int16_t int16_t;
 242     #endif
 243
 244     #ifndef _INT32_T
 245     #define _INT32_T
 246     typedef $acx_cv_type_int32_t int32_t;
 247     #endif
 248 EOF
 249 elif test "$ac_cv_type_u_int32_t" = yes; then
 250   sed 's/^ *//' >> tmp-stdint.h <<EOF
 251
 252     /* int8_t int16_t int32_t defined by inet code, we do the u_intXX types */
 253     #ifndef _INT8_T
 254     #define _INT8_T
 255     #endif
 256     #ifndef _INT16_T
 257     #define _INT16_T
 258     #endif
 259     #ifndef _INT32_T
 260     #define _INT32_T
 261     #endif
 262
 263     #ifndef _UINT8_T
 264     #define _UINT8_T
 265     typedef u_int8_t uint8_t;
 266     #endif
 267
 268     #ifndef _UINT16_T
 269     #define _UINT16_T
 270     typedef u_int16_t uint16_t;
 271     #endif
 272
 273     #ifndef _UINT32_T
 274     #define _UINT32_T
 275     typedef u_int32_t uint32_t;
 276     #endif
 277 EOF
 278 else
 279   sed 's/^ *//' >> tmp-stdint.h <<EOF
 280
 281     /* Some systems have guard macros to prevent redefinitions, define them.  */
 282     #ifndef _INT8_T
 283     #define _INT8_T
 284     #endif
 285     #ifndef _INT16_T
 286     #define _INT16_T
 287     #endif
 288     #ifndef _INT32_T
 289     #define _INT32_T
 290     #endif
 291     #ifndef _UINT8_T
 292     #define _UINT8_T
 293     #endif
 294     #ifndef _UINT16_T
 295     #define _UINT16_T
 296     #endif
 297     #ifndef _UINT32_T
 298     #define _UINT32_T
 299     #endif
 300 EOF
 301 fi
 302
 303 # ------------- done basic int types, emit int64_t types ------------
 304 if test "$ac_cv_type_uint64_t" = yes; then
 305   sed 's/^ *//' >> tmp-stdint.h <<EOF
 306
 307     /* system headers have good uint64_t and int64_t */
 308     #ifndef _INT64_T
 309     #define _INT64_T
 310     #endif
 311     #ifndef _UINT64_T
 312     #define _UINT64_T
 313     #endif
 314 EOF
 315 elif test "$ac_cv_type_u_int64_t" = yes; then
 316   sed 's/^ *//' >> tmp-stdint.h <<EOF
 317
 318     /* system headers have an u_int64_t (and int64_t) */
 319     #ifndef _INT64_T
 320     #define _INT64_T
 321     #endif
 322     #ifndef _UINT64_T
 323     #define _UINT64_T
 324     typedef u_int64_t uint64_t;
 325     #endif
 326 EOF
 327 elif test -n "$acx_cv_type_int64_t"; then
 328   sed 's/^ *//' >> tmp-stdint.h <<EOF
 329
 330     /* architecture has a 64-bit type, $acx_cv_type_int64_t */
 331     #ifndef _INT64_T
 332     #define _INT64_T
 333     typedef $acx_cv_type_int64_t int64_t;
 334     #endif
 335     #ifndef _UINT64_T
 336     #define _UINT64_T
 337     typedef unsigned $acx_cv_type_int64_t uint64_t;
 338     #endif
 339 EOF
 340 else
 341   sed 's/^ *//' >> tmp-stdint.h <<EOF
 342
 343     /* some common heuristics for int64_t, using compiler-specific tests */
 344     #if defined __STDC_VERSION__ && (__STDC_VERSION__-0) >= 199901L
 345     #ifndef _INT64_T
 346     #define _INT64_T
 347     typedef long long int64_t;
 348     #endif
 349     #ifndef _UINT64_T
 350     #define _UINT64_T
 351     typedef unsigned long long uint64_t;
 352     #endif
 353
 354     #elif defined __GNUC__ && defined (__STDC__) && __STDC__-0
 355     /* NextStep 2.0 cc is really gcc 1.93 but it defines __GNUC__ = 2 and
 356        does not implement __extension__.  But that compiler doesn't define
 357        __GNUC_MINOR__.  */
 358     # if __GNUC__ < 2 || (__NeXT__ && !__GNUC_MINOR__)
 359     # define __extension__
 360     # endif
 361
 362     # ifndef _INT64_T
 363     # define _INT64_T
 364     __extension__ typedef long long int64_t;
 365     # endif
 366     # ifndef _UINT64_T
 367     # define _UINT64_T
 368     __extension__ typedef unsigned long long uint64_t;
 369     # endif
 370
 371     #elif !defined __STRICT_ANSI__
 372     # if defined _MSC_VER || defined __WATCOMC__ || defined __BORLANDC__
 373
 374     #  ifndef _INT64_T
 375     #  define _INT64_T
 376     typedef __int64 int64_t;
 377     #  endif
 378     #  ifndef _UINT64_T
 379     #  define _UINT64_T
 380     typedef unsigned __int64 uint64_t;
 381     #  endif
 382     # endif /* compiler */
 383
 384     #endif /* ANSI version */
 385 EOF
 386 fi
 387
 388 # ------------- done int64_t types, emit intptr types ------------
 389 if test "$ac_cv_type_uintptr_t" != yes; then
 390   sed 's/^ *//' >> tmp-stdint.h <<EOF
 391
 392     /* Define intptr_t based on sizeof(void*) = $ac_cv_sizeof_void_p */
 393     typedef u$acx_cv_type_intptr_t uintptr_t;
 394     typedef $acx_cv_type_intptr_t  intptr_t;
 395 EOF
 396 fi
 397
 398 # ------------- done intptr types, emit int_least types ------------
 399 if test "$ac_cv_type_int_least32_t" != yes; then
 400   sed 's/^ *//' >> tmp-stdint.h <<EOF
 401
 402     /* Define int_least types */
 403     typedef int8_t     int_least8_t;
 404     typedef int16_t    int_least16_t;
 405     typedef int32_t    int_least32_t;
 406     #ifdef _INT64_T
 407     typedef int64_t    int_least64_t;
 408     #endif
 409
 410     typedef uint8_t    uint_least8_t;
 411     typedef uint16_t   uint_least16_t;
 412     typedef uint32_t   uint_least32_t;
 413     #ifdef _UINT64_T
 414     typedef uint64_t   uint_least64_t;
 415     #endif
 416 EOF
 417 fi
 418
 419 # ------------- done intptr types, emit int_fast types ------------
 420 if test "$ac_cv_type_int_fast32_t" != yes; then
 421   dnl NOTE: The following code assumes that sizeof (int) > 1.
 422   dnl Fix when strange machines are reported.
 423   sed 's/^ *//' >> tmp-stdint.h <<EOF
 424
 425     /* Define int_fast types.  short is often slow */
 426     typedef int8_t       int_fast8_t;
 427     typedef int          int_fast16_t;
 428     typedef int32_t      int_fast32_t;
 429     #ifdef _INT64_T
 430     typedef int64_t      int_fast64_t;
 431     #endif
 432
 433     typedef uint8_t      uint_fast8_t;
 434     typedef unsigned int uint_fast16_t;
 435     typedef uint32_t     uint_fast32_t;
 436     #ifdef _UINT64_T
 437     typedef uint64_t     uint_fast64_t;
 438     #endif
 439 EOF
 440 fi
 441
 442 if test "$ac_cv_type_uintmax_t" != yes; then
 443   sed 's/^ *//' >> tmp-stdint.h <<EOF
 444
 445     /* Define intmax based on what we found */
 446     #ifdef _INT64_T
 447     typedef int64_t       intmax_t;
 448     #else
 449     typedef long          intmax_t;
 450     #endif
 451     #ifdef _UINT64_T
 452     typedef uint64_t      uintmax_t;
 453     #else
 454     typedef unsigned long uintmax_t;
 455     #endif
 456 EOF
 457 fi
 458
 459 sed 's/^ *//' >> tmp-stdint.h <<EOF
 460
 461   #endif /* GCC_GENERATED_STDINT_H */
 462 EOF
 463
 464 if test -r ]_GCC_STDINT_H[ && cmp -s tmp-stdint.h ]_GCC_STDINT_H[; then
 465   rm -f tmp-stdint.h
 466 else
 467   mv -f tmp-stdint.h ]_GCC_STDINT_H[
 468 fi
 469
 470 ], [
 471 GCC="$GCC"
 472 CC="$CC"
 473 acx_cv_header_stdint="$acx_cv_header_stdint"
 474 acx_cv_type_int8_t="$acx_cv_type_int8_t"
 475 acx_cv_type_int16_t="$acx_cv_type_int16_t"
 476 acx_cv_type_int32_t="$acx_cv_type_int32_t"
 477 acx_cv_type_int64_t="$acx_cv_type_int64_t"
 478 acx_cv_type_intptr_t="$acx_cv_type_intptr_t"
 479 ac_cv_type_uintmax_t="$ac_cv_type_uintmax_t"
 480 ac_cv_type_uintptr_t="$ac_cv_type_uintptr_t"
 481 ac_cv_type_uint64_t="$ac_cv_type_uint64_t"
 482 ac_cv_type_u_int64_t="$ac_cv_type_u_int64_t"
 483 ac_cv_type_u_int32_t="$ac_cv_type_u_int32_t"
 484 ac_cv_type_int_least32_t="$ac_cv_type_int_least32_t"
 485 ac_cv_type_int_fast32_t="$ac_cv_type_int_fast32_t"
 486 ac_cv_sizeof_void_p="$ac_cv_sizeof_void_p"
 487 ])
 488
 489 ])