文件操作 - ax_cxx_dynamic_cast.m4
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文件: /usr/share/aclocal/ax_cxx_dynamic_cast.m4
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# =========================================================================== # https://www.gnu.org/software/autoconf-archive/ax_cxx_dynamic_cast.html # =========================================================================== # # SYNOPSIS # # AX_CXX_DYNAMIC_CAST # # DESCRIPTION # # If the compiler supports dynamic_cast<>, define HAVE_DYNAMIC_CAST. # # 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_DYNAMIC_CAST], [AX_CXX_DYNAMIC_CAST]) AC_DEFUN([AX_CXX_DYNAMIC_CAST], [AC_CACHE_CHECK(whether the compiler supports dynamic_cast<>, ax_cv_cxx_dynamic_cast, [AC_LANG_SAVE AC_LANG_CPLUSPLUS AC_TRY_COMPILE([#include <typeinfo> class Base { public : Base () {} virtual void f () = 0;}; class Derived : public Base { public : Derived () {} virtual void f () {} };],[ Derived d; Base& b=d; return dynamic_cast<Derived*>(&b) ? 0 : 1;], ax_cv_cxx_dynamic_cast=yes, ax_cv_cxx_dynamic_cast=no) AC_LANG_RESTORE ]) if test "$ax_cv_cxx_dynamic_cast" = yes; then AC_DEFINE(HAVE_DYNAMIC_CAST,,[define if the compiler supports dynamic_cast<>]) fi ])
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