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55 lines
1.7 KiB
Plaintext
55 lines
1.7 KiB
Plaintext
# uintptr_t.m4 serial 3
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# Copyright (C) 2004 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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# Written by Paul Eggert.
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AC_DEFUN([gl_AC_TYPE_UINTPTR_T],
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[
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AC_CACHE_CHECK([for uintptr_t], gl_cv_c_uintptr_t,
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[gl_cv_c_uintptr_t=no
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for ac_type in "uintptr_t" "unsigned int" \
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"unsigned long int" "unsigned long long int"; do
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AC_COMPILE_IFELSE(
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[AC_LANG_BOOL_COMPILE_TRY(
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[AC_INCLUDES_DEFAULT],
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[[sizeof (void *) <= sizeof (uintptr_t)]])],
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[gl_cv_c_uintptr_t=$ac_type])
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test $gl_cv_c_uintptr_t != no && break
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done])
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case $gl_cv_c_uintptr_t in
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no|uintptr_t) ;;
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*)
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AC_DEFINE_UNQUOTED(uintptr_t, $gl_cv_c_uintptr_t,
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[Define to the type of a unsigned integer type wide enough to
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hold a pointer, if such a type exists.])
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;;
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esac
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dnl Check whether UINTPTR_MAX is defined, not whether it has the
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dnl right value. Alas, Solaris 8 defines it to empty!
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dnl Applications should use (uintptr_t) -1 rather than UINTPTR_MAX.
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AC_CACHE_CHECK([for UINTPTR_MAX], gl_cv_c_uintptr_max,
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[AC_INCLUDES_DEFAULT],
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[[#ifndef UINTPTR_MAX
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error: UINTPTR_MAX is not defined.
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#endif]])],
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[gl_cv_c_uintptr_max=yes],
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[gl_cv_c_uintptr_max=no])])
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case $gl_cv_c_uintptr_max,$gl_cv_c_uintptr_t in
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yes,*) ;;
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*,no) ;;
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*)
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AC_DEFINE(UINTPTR_MAX, ((uintptr_t) -1),
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[Define to its maximum value if an unsigned integer type wide enough
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to hold a pointer exists and the standard includes do not define
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UINTPTR_MAX.])
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;;
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esac
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])
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