文件操作 - ax_cxx_header_unordered_set.m4
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文件: /usr/share/aclocal/ax_cxx_header_unordered_set.m4
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# ================================================================================ # https://www.gnu.org/software/autoconf-archive/ax_cxx_header_unordered_set.html # ================================================================================ # # SYNOPSIS # # AX_CXX_HEADER_UNORDERED_SET # # DESCRIPTION # # Check whether the C++ include <unordered_set> exists and define # HAVE_UNORDERED_SET if it does. # # LICENSE # # Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.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 7 AU_ALIAS([AC_CXX_HEADER_UNORDERED_SET], [AX_CXX_HEADER_UNORDERED_SET]) AC_DEFUN([AX_CXX_HEADER_UNORDERED_SET], [ AC_CACHE_CHECK(for unordered_set, ax_cv_cxx_unordered_set, [AC_REQUIRE([AC_COMPILE_STDCXX_0X]) AC_LANG_SAVE AC_LANG_CPLUSPLUS ac_save_CXXFLAGS="$CXXFLAGS" CXXFLAGS="$CXXFLAGS -std=gnu++0x" AC_TRY_COMPILE([#include <unordered_set>], [using std::unordered_set;], ax_cv_cxx_unordered_set=yes, ax_cv_cxx_unordered_set=no) CXXFLAGS="$ac_save_CXXFLAGS" AC_LANG_RESTORE ]) if test "$ax_cv_cxx_unordered_set" = yes; then AC_DEFINE(HAVE_UNORDERED_SET,,[Define if unordered_set is present. ]) fi ])
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