文件操作 - ax_cxx_have_hash.m4
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文件: /usr/share/aclocal/ax_cxx_have_hash.m4
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# =========================================================================== # https://www.gnu.org/software/autoconf-archive/ax_cxx_have_hash.html # =========================================================================== # # SYNOPSIS # # AX_CXX_HAVE_HASH() # # DESCRIPTION # # This macro checks if std::hash, added in C++11, is defined in the # <functional> header. # # If it is, define the ax_cv_cxx_have_hash environment variable to "yes" # and define HAVE_CXX_HASH. # # LICENSE # # Copyright (c) 2014 Enrico M. Crisostomo <enrico.m.crisostomo@gmail.com> # # Copying and distribution of this file, with or without modification, are # permitted in any medium without royalty provided the copyright notice # and this notice are preserved. This file is offered as-is, without any # warranty. #serial 3 AC_DEFUN([AX_CXX_HAVE_HASH], [AC_CACHE_CHECK( [for std::hash in functional], ax_cv_cxx_have_hash, [dnl AC_LANG_PUSH([C++]) AC_COMPILE_IFELSE([AC_LANG_PROGRAM( [ [#include <functional>] [#include <string>] [using std::hash;] ], [] )], [ax_cv_cxx_have_hash=yes], [ax_cv_cxx_have_hash=no] ) AC_LANG_POP([C++])]) if test x"$ax_cv_cxx_have_hash" = "xyes" then AC_DEFINE(HAVE_CXX_HASH, 1, [Define if functional defines the std::hash class.]) fi ])
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