diff options
Diffstat (limited to 'm4/uintptr_t.m4')
-rw-r--r-- | m4/uintptr_t.m4 | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/m4/uintptr_t.m4 b/m4/uintptr_t.m4 new file mode 100644 index 000000000..6eca16d0c --- /dev/null +++ b/m4/uintptr_t.m4 @@ -0,0 +1,65 @@ +# uintptr_t.m4 serial 1 + +# Copyright (C) 2004 Free Software Foundation, Inc. + +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2, or (at your option) +# any later version. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. + +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software Foundation, +# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +# Written by Paul Eggert. + +AC_DEFUN([gl_AC_TYPE_UINTPTR_T], +[ + AC_CACHE_CHECK([for uintptr_t], gl_cv_c_uintptr_t, + [gl_cv_c_uintptr_t=no + for ac_type in "uintptr_t" "unsigned int" \ + "unsigned long int" "unsigned long long int"; do + AC_COMPILE_IFELSE( + [AC_LANG_BOOL_COMPILE_TRY( + [AC_INCLUDES_DEFAULT], + [[sizeof (void *) <= sizeof (uintptr_t)]])], + [gl_cv_c_uintptr_t=$ac_type]) + test $gl_cv_c_uintptr_t != no && break + done]) + case $gl_cv_c_uintptr_t in + no|uintptr_t) ;; + *) + AC_DEFINE_UNQUOTED(uintptr_t, $gl_cv_c_uintptr_t, + [Define to the type of a unsigned integer type wide enough to + hold a pointer, if such a type exists.]) + ;; + esac + + dnl Check whether UINTPTR_MAX is defined, not whether it has the + dnl right value. Alas, Solaris 8 defines it to empty! + dnl Applications should use (uintptr_t) -1 rather than UINTPTR_MAX. + AC_CACHE_CHECK([for UINTPTR_MAX], gl_cv_c_uintptr_max, + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [AC_INCLUDES_DEFAULT], + [[#ifndef UINTPTR_MAX + error: UINTPTR_MAX is not defined. + #endif]])], + [gl_cv_c_uintptr_max=yes], + [gl_cv_c_uintptr_max=no])]) + case $gl_cv_c_uintptr_max,$gl_cv_c_uintptr_t in + yes,*) ;; + *,no) ;; + *) + AC_DEFINE(UINTPTR_MAX, ((uintptr_t) -1), + [Define to its maximum value if an unsigned integer type wide enough + to hold a pointer exists and the standard includes do not define + UINTPTR_MAX.]) + ;; + esac +]) |