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137 lines
4.9 KiB
Plaintext
137 lines
4.9 KiB
Plaintext
dnl ***** BEGIN LICENSE BLOCK *****
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dnl Version: MPL 1.1/GPL 2.0/LGPL 2.1
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dnl
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dnl The contents of this file are subject to the Mozilla Public License Version
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dnl 1.1 (the "License"); you may not use this file except in compliance with
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dnl the License. You may obtain a copy of the License at
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dnl http://www.mozilla.org/MPL/
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dnl
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dnl Software distributed under the License is distributed on an "AS IS" basis,
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dnl WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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dnl for the specific language governing rights and limitations under the
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dnl License.
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dnl
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dnl The Original Code is mozilla.org code.
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dnl
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dnl The Initial Developer of the Original Code is
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dnl The Mozilla Foundation
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dnl Portions created by the Initial Developer are Copyright (C) 2008
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dnl the Initial Developer. All Rights Reserved.
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dnl
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dnl Contributor(s):
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dnl Jim Blandy
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dnl
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dnl Alternatively, the contents of this file may be used under the terms of
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dnl either of the GNU General Public License Version 2 or later (the "GPL"),
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dnl or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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dnl in which case the provisions of the GPL or the LGPL are applicable instead
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dnl of those above. If you wish to allow use of your version of this file only
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dnl under the terms of either the GPL or the LGPL, and not to allow others to
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dnl use your version of this file under the terms of the MPL, indicate your
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dnl decision by deleting the provisions above and replace them with the notice
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dnl and other provisions required by the GPL or the LGPL. If you do not delete
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dnl the provisions above, a recipient may use your version of this file under
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dnl the terms of any one of the MPL, the GPL or the LGPL.
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dnl
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dnl ***** END LICENSE BLOCK *****
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dnl MOZ_N_BYTE_TYPE(VARIABLE, SIZE, POSSIBLE-TYPES)
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dnl
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dnl Check to see which of POSSIBLE-TYPES has a size of SIZE. If we
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dnl find one, define VARIABLE to be the size-BYTE type. If no type
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dnl matches, exit the configure script with an error message. Types
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dnl whose written form contains spaces should appear in POSSIBLE-TYPES
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dnl enclosed by shell quotes.
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dnl
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dnl The cache variable moz_cv_n_byte_type_VARIABLE gets set to the
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dnl type, if found.
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dnl
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dnl for example:
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dnl MOZ_N_BYTE_TYPE([JS_INT32_T], [4], [int long 'long long' short])
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dnl
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AC_DEFUN([MOZ_N_BYTE_TYPE],
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[
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dnl The simplest approach would simply be to run a program that says
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dnl printf ("%d\n", sizeof ($type));
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dnl But that won't work when cross-compiling; this will.
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AC_CACHE_CHECK([for a $2-byte type], moz_cv_n_byte_type_$1, [
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moz_cv_n_byte_type_$1=
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for type in $3; do
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AC_TRY_COMPILE([],
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[
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int a[sizeof ($type) == $2 ? 1 : -1];
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return 0;
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],
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[moz_cv_n_byte_type_$1=$type; break], [])
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done
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if test ! "$moz_cv_n_byte_type_$1"; then
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AC_MSG_ERROR([Couldn't find a $2-byte type])
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fi
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])
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AC_DEFINE_UNQUOTED($1, [$moz_cv_n_byte_type_$1],
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[a $2-byte type on the target machine])
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])
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dnl MOZ_SIZE_OF_TYPE(VARIABLE, TYPE, POSSIBLE-SIZES)
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dnl
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dnl Check to see which of POSSIBLE-SIZES is the sizeof(TYPE). If we find one,
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dnl define VARIABLE SIZE. If no size matches, exit the configure script with
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dnl an error message.
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dnl
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dnl The cache variable moz_cv_size_of_VARIABLE gets set to the size, if
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dnl found.
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dnl
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dnl for example:
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dnl MOZ_SIZE_OF_TYPE([JS_BYTES_PER_WORD], [void*], [4 8])
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AC_DEFUN([MOZ_SIZE_OF_TYPE],
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[
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AC_CACHE_CHECK([for the size of $2], moz_cv_size_of_$1, [
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moz_cv_size_of_$1=
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for size in $3; do
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AC_TRY_COMPILE([],
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[
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int a[sizeof ($2) == $size ? 1 : -1];
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return 0;
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],
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[moz_cv_size_of_$1=$size; break], [])
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done
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if test ! "$moz_cv_size_of_$1"; then
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AC_MSG_ERROR([No size found for $2])
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fi
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])
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AC_DEFINE_UNQUOTED($1, [$moz_cv_size_of_$1])
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])
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dnl MOZ_ALIGN_OF_TYPE(VARIABLE, TYPE, POSSIBLE-ALIGNS)
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dnl
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dnl Check to see which of POSSIBLE-ALIGNS is the necessary alignment of TYPE.
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dnl If we find one, define VARIABLE ALIGNMENT. If no alignment matches, exit
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dnl the configure script with an error message.
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dnl
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dnl The cache variable moz_cv_align_of_VARIABLE gets set to the size, if
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dnl found.
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dnl
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dnl for example:
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dnl MOZ_ALIGN_OF_TYPE(JS_ALIGN_OF_POINTER, void*, 2 4 8 16)
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AC_DEFUN([MOZ_ALIGN_OF_TYPE],
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[
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AC_CACHE_CHECK([for the alignment of $2], moz_cv_align_of_$1, [
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moz_cv_align_of_$1=
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for align in $3; do
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AC_TRY_COMPILE([
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#include <stddef.h>
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struct aligner { char c; $2 a; };
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],
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[
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int a[offsetof(struct aligner, a) == $align ? 1 : -1];
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return 0;
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],
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[moz_cv_align_of_$1=$align; break], [])
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done
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if test ! "$moz_cv_align_of_$1"; then
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AC_MSG_ERROR([No alignment found for $2])
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fi
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])
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AC_DEFINE_UNQUOTED($1, [$moz_cv_align_of_$1])
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])
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