kc3-lang/SDL/acinclude/ax_gcc_x86_cpuid.m4

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• Hash : 5a34f1e3
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  Date : 2018-09-15T09:24:04
  

  acinclude: rename ax_gcc_x86_cpuid.m4.htm to ax_gcc_x86_cpuid.m4

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• acinclude/ax_gcc_x86_cpuid.m4

• # ===========================================================================
  #     http://www.gnu.org/software/autoconf-archive/ax_gcc_x86_cpuid.html
  # ===========================================================================
  #
  # SYNOPSIS
  #
  #   AX_GCC_X86_CPUID(OP)
  #
  # DESCRIPTION
  #
  #   On Pentium and later x86 processors, with gcc or a compiler that has a
  #   compatible syntax for inline assembly instructions, run a small program
  #   that executes the cpuid instruction with input OP. This can be used to
  #   detect the CPU type.
  #
  #   On output, the values of the eax, ebx, ecx, and edx registers are stored
  #   as hexadecimal strings as "eax:ebx:ecx:edx" in the cache variable
  #   ax_cv_gcc_x86_cpuid_OP.
  #
  #   If the cpuid instruction fails (because you are running a
  #   cross-compiler, or because you are not using gcc, or because you are on
  #   a processor that doesn't have this instruction), ax_cv_gcc_x86_cpuid_OP
  #   is set to the string "unknown".
  #
  #   This macro mainly exists to be used in AX_GCC_ARCHFLAG.
  #
  # LICENSE
  #
  #   Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
  #   Copyright (c) 2008 Matteo Frigo
  #
  #   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 <http://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 7
  
  AC_DEFUN([AX_GCC_X86_CPUID],
  [AC_REQUIRE([AC_PROG_CC])
  AC_LANG_PUSH([C])
  AC_CACHE_CHECK(for x86 cpuid $1 output, ax_cv_gcc_x86_cpuid_$1,
   [AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>], [
       int op = $1, eax, ebx, ecx, edx;
       FILE *f;
        __asm__("cpuid"
          : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx)
          : "a" (op));
       f = fopen("conftest_cpuid", "w"); if (!f) return 1;
       fprintf(f, "%x:%x:%x:%x\n", eax, ebx, ecx, edx);
       fclose(f);
       return 0;
  ])],
       [ax_cv_gcc_x86_cpuid_$1=`cat conftest_cpuid`; rm -f conftest_cpuid],
       [ax_cv_gcc_x86_cpuid_$1=unknown; rm -f conftest_cpuid],
       [ax_cv_gcc_x86_cpuid_$1=unknown])])
  AC_LANG_POP([C])
  ])
  

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