文件操作 - ax_gcc_x86_cpu_supports.m4
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文件: /usr/share/aclocal/ax_gcc_x86_cpu_supports.m4
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# ============================================================================ # https://www.gnu.org/software/autoconf-archive/ax_gcc_x86_cpu_supports.html # ============================================================================ # # SYNOPSIS # # AX_GCC_X86_CPU_SUPPORTS(X86-INSTRUCTION-SET, # [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND]) # # DESCRIPTION # # Checks if the host cpu supports X86-INSTRUCTION-SET. The instruction set # that can be tested are "mmx, popcnt, sse, sse2, sse3, sse4.1, sse4.2, # sse4a, avx, avx2, avx512f, fma, fma4, bmi, bmi2". If the instruction set # is supported by the host cpu, the C preprocessor macro # HAVE_XXX_INSTRUCTIONS is set to 1. The XXX is up-cased instruction case # with dot replaced by underscore. For example, the test for "sse4.2" # would export HAVE_SSE4_2_INSTRUCTIONS=1. This macro requires gcc # extended builtin function "__builtin_cpu_init" and # "__builtin_cpu_supports" to detect the cpu features. It will error out # if the compiler doesn't has these builtins. # # If the test for the instruction set succeeded, the hook ACTION-IF-FOUND # would run. Otherwise the hook ACTION-IF-NOT-FOUND would run if # specified. # # See also AX_CHECK_X86_FEATURES, which checks all the possible # instruction set and export the corresponding CFLAGS. # # LICENSE # # Copyright (c) 2016 Felix Chern <idryman@gmail.com> # # 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 3 AC_DEFUN_ONCE([_AX_GCC_X86_CPU_INIT], [AC_LANG_PUSH([C]) AC_CACHE_CHECK([for gcc __builtin_cpu_init function], [ax_cv_gcc_check_x86_cpu_init], [AC_RUN_IFELSE( [AC_LANG_PROGRAM([#include <stdlib.h>], [__builtin_cpu_init ();]) ], [ax_cv_gcc_check_x86_cpu_init=yes], [ax_cv_gcc_check_x86_cpu_init=no])]) AS_IF([test "X$ax_cv_gcc_check_x86_cpu_init" = "Xno"], [AC_MSG_ERROR([Need GCC to support X86 CPU features tests])]) ]) AC_DEFUN([AX_GCC_X86_CPU_SUPPORTS], [AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([_AX_GCC_X86_CPU_INIT]) AC_LANG_PUSH([C]) AS_VAR_PUSHDEF([gcc_x86_feature], [AS_TR_SH([ax_cv_gcc_x86_cpu_supports_$1])]) AC_CACHE_CHECK([for x86 $1 instruction support], [gcc_x86_feature], [AC_RUN_IFELSE( [AC_LANG_PROGRAM( [#include <stdlib.h> ], [ __builtin_cpu_init (); if (__builtin_cpu_supports("$1")) return 0; return 1; ])], [gcc_x86_feature=yes], [gcc_x86_feature=no] )] ) AC_LANG_POP([C]) AS_VAR_IF([gcc_x86_feature],[yes], [AC_DEFINE( AS_TR_CPP([HAVE_$1_INSTRUCTIONS]), [1], [Define if $1 instructions are supported]) $2], [$3] ) AS_VAR_POPDEF([gcc_x86_feature]) ])
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