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ax_compile_check_sizeof.m4
# ============================================================================ # https://www.gnu.org/software/autoconf-archive/ax_compile_check_sizeof.html # ============================================================================ # # SYNOPSIS # # AX_COMPILE_CHECK_SIZEOF(TYPE [, HEADERS [, EXTRA_SIZES...]]) # # DESCRIPTION # # This macro checks for the size of TYPE using compile checks, not run # checks. You can supply extra HEADERS to look into. the check will cycle # through 1 2 4 8 16 and any EXTRA_SIZES the user supplies. If a match is # found, it will #define SIZEOF_`TYPE' to that value. Otherwise it will # emit a configure time error indicating the size of the type could not be # determined. # # The trick is that C will not allow duplicate case labels. While this is # valid C code: # # switch (0) case 0: case 1:; # # The following is not: # # switch (0) case 0: case 0:; # # Thus, the AC_TRY_COMPILE will fail if the currently tried size does not # match. # # Here is an example skeleton configure.in script, demonstrating the # macro's usage: # # AC_PROG_CC # AC_CHECK_HEADERS(stddef.h unistd.h) # AC_TYPE_SIZE_T # AC_CHECK_TYPE(ssize_t, int) # # headers='#ifdef HAVE_STDDEF_H # #include <stddef.h> # #endif # #ifdef HAVE_UNISTD_H # #include <unistd.h> # #endif # ' # # AX_COMPILE_CHECK_SIZEOF(char) # AX_COMPILE_CHECK_SIZEOF(short) # AX_COMPILE_CHECK_SIZEOF(int) # AX_COMPILE_CHECK_SIZEOF(long) # AX_COMPILE_CHECK_SIZEOF(unsigned char *) # AX_COMPILE_CHECK_SIZEOF(void *) # AX_COMPILE_CHECK_SIZEOF(size_t, $headers) # AX_COMPILE_CHECK_SIZEOF(ssize_t, $headers) # AX_COMPILE_CHECK_SIZEOF(ptrdiff_t, $headers) # AX_COMPILE_CHECK_SIZEOF(off_t, $headers) # # LICENSE # # Copyright (c) 2008 Kaveh Ghazi <ghazi@caip.rutgers.edu> # # 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 3 of the License, 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, see <https://www.gnu.org/licenses/>. # # As a special exception, the respective Autoconf Macro's copyright owner # gives unlimited permission to copy, distribute and modify the configure # scripts that are the output of Autoconf when processing the Macro. You # need not follow the terms of the GNU General Public License when using # or distributing such scripts, even though portions of the text of the # Macro appear in them. The GNU General Public License (GPL) does govern # all other use of the material that constitutes the Autoconf Macro. # # This special exception to the GPL applies to versions of the Autoconf # Macro released by the Autoconf Archive. When you make and distribute a # modified version of the Autoconf Macro, you may extend this special # exception to the GPL to apply to your modified version as well. #serial 6 AU_ALIAS([AC_COMPILE_CHECK_SIZEOF], [AX_COMPILE_CHECK_SIZEOF]) AC_DEFUN([AX_COMPILE_CHECK_SIZEOF], [changequote(<<, >>)dnl dnl The name to #define. define(<<AC_TYPE_NAME>>, translit(sizeof_$1, [a-z *], [A-Z_P]))dnl dnl The cache variable name. define(<<AC_CV_NAME>>, translit(ac_cv_sizeof_$1, [ *], [_p]))dnl changequote([, ])dnl AC_MSG_CHECKING(size of $1) AC_CACHE_VAL(AC_CV_NAME, [for ac_size in 4 8 1 2 16 $3 ; do # List sizes in rough order of prevalence. AC_TRY_COMPILE([#include "confdefs.h" #include <sys/types.h> $2 ], [switch (0) case 0: case (sizeof ($1) == $ac_size):;], AC_CV_NAME=$ac_size) if test x$AC_CV_NAME != x ; then break; fi done ]) if test x$AC_CV_NAME = x ; then AC_MSG_ERROR([cannot determine a size for $1]) fi AC_MSG_RESULT($AC_CV_NAME) AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME, [The number of bytes in type $1]) undefine([AC_TYPE_NAME])dnl undefine([AC_CV_NAME])dnl ])