文件操作 - ax_cxx_partial_ordering.m4
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文件: /usr/share/aclocal/ax_cxx_partial_ordering.m4
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# ============================================================================ # https://www.gnu.org/software/autoconf-archive/ax_cxx_partial_ordering.html # ============================================================================ # # SYNOPSIS # # AX_CXX_PARTIAL_ORDERING # # DESCRIPTION # # If the compiler supports partial ordering, define HAVE_PARTIAL_ORDERING. # # LICENSE # # Copyright (c) 2008 Todd Veldhuizen # Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org> # # 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_PARTIAL_ORDERING], [AX_CXX_PARTIAL_ORDERING]) AC_DEFUN([AX_CXX_PARTIAL_ORDERING], [AC_CACHE_CHECK(whether the compiler supports partial ordering, ax_cv_cxx_partial_ordering, [AC_LANG_SAVE AC_LANG_CPLUSPLUS AC_TRY_COMPILE([ template<int N> struct I {}; template<class T> struct A { int r; template<class T1, class T2> int operator() (T1, T2) { r = 0; return r; } template<int N1, int N2> int operator() (I<N1>, I<N2>) { r = 1; return r; } };],[A<float> x, y; I<0> a; I<1> b; return x (a,b) + y (float(), double());], ax_cv_cxx_partial_ordering=yes, ax_cv_cxx_partial_ordering=no) AC_LANG_RESTORE ]) if test "$ax_cv_cxx_partial_ordering" = yes; then AC_DEFINE(HAVE_PARTIAL_ORDERING,, [define if the compiler supports partial ordering]) fi ])
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