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ax_c_compile_value.m4
# =========================================================================== # https://www.gnu.org/software/autoconf-archive/ax_c_compile_value.html # =========================================================================== # # SYNOPSIS # # AX_C_COMPILE_VALUE (COMPILE-VALUE, ALIAS, INCLUDES) # # DESCRIPTION # # The AX_C_COMPILE_VALUE macro determines a compile time value by # generating the object code and reading the value from the code. Static # data initializers like sizeof(int) are unavailable to preprocessor. The # macro calculates the values known to compiler's static initializer. # # Assumptions: The sought value should not exceed 65535. The shell # interpreter and the sed utility are expected to exist and work similarly # across possible build platforms. # # Result: The resulting configure script will generate the preprocessor # symbol definition: # # #define COMPILE_VALUE_<ALIAS> <NUMBER> # # It was important that the value was embedded into the object file in a # predefined byte order during the test. This ensured that the result was # independent from the target platform's byte order. # # The existing AC_CHECK_SIZEOF macro also computes the size of the given # type without running the test program. However, the existing macro will # produce a piece of configure script that will take the time proportional # to the logarithm of the sought value. # # Example of use in configure.in: # # AX_C_COMPILE_VALUE(sizeof(int), sizeof_int) # AX_C_COMPILE_VALUE([sizeof(int[[543]])], sizeof_int543) # # As a result of runnfing the generated configure script, the following # definition will appear in config.h: # # #define COMPILE_VALUE_SIZEOF_INT 4 # #define COMPILE_VALUE_SIZEOF_INT543 2172 # # LICENSE # # Copyright (c) 2008 Ilguiz Latypov # # 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 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 5 ## Portability defines that help interoperate with classic and modern autoconfs ifdef([AC_TR_SH],[ define([AC_TR_SH_REUSE],[AC_TR_SH([$1])]) define([AC_TR_CPP_REUSE],[AC_TR_CPP([$1])]) ], [ define([AC_TR_SH_REUSE], [patsubst(translit([[$1]], [*+], [pp]), [[^a-zA-Z0-9_]], [_])]) define([AC_TR_CPP_REUSE], [patsubst(translit([[$1]], [*abcdefghijklmnopqrstuvwxyz], [PABCDEFGHIJKLMNOPQRSTUVWXYZ]), [[^A-Z0-9_]], [_])]) ]) AC_DEFUN([AX_C_COMPILE_VALUE], [ pushdef([ac_c_compile_value], AC_TR_SH_REUSE([ac_cv_c_compile_value_$2]))dnl ac_c_compile_value_expand="$1" AC_CACHE_CHECK([value of $1 by analyzing object code], ac_c_compile_value, [ save_CFLAGS="$CFLAGS" CFLAGS="$CFLAGS -c -o conftest.o" AC_TRY_COMPILE([$3 #include <stddef.h> #include <stdint.h> #include <stdlib.h> #define COMPILE_VALUE $ac_c_compile_value_expand #define HEX_DIGIT(n) ((n) >= 10 ? 'a' + (n) - 10 : '0' + (n)) char object_code_block[] = { '\n', 'e', '4', 'V', 'A', '0', 'x', (char) HEX_DIGIT((((COMPILE_VALUE / 16) / 16) / 16) % 16), (char) HEX_DIGIT(((COMPILE_VALUE / 16) / 16) % 16), (char) HEX_DIGIT((COMPILE_VALUE / 16) % 16), (char) HEX_DIGIT(COMPILE_VALUE % 16), 'Y', '3', 'p', 'M', '\n' };], [], [ac_c_compile_value=` typeset -i n=\`sed -ne 's/^e4VA0x\(.*\)Y3pM$/0x\1/p' < conftest.o\`; echo $n`], [ac_c_compile_value=0]) CFLAGS="$save_CFLAGS"]) AC_DEFINE_UNQUOTED(AC_TR_CPP_REUSE(compile_value_$2), [$[]ac_c_compile_value], [$1]) popdef([ac_c_compile_value])dnl ])