文件操作 - ax_cxx_reinterpret_cast.m4
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文件: /usr/share/aclocal/ax_cxx_reinterpret_cast.m4
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# ============================================================================ # https://www.gnu.org/software/autoconf-archive/ax_cxx_reinterpret_cast.html # ============================================================================ # # SYNOPSIS # # AX_CXX_REINTERPRET_CAST # # DESCRIPTION # # If the compiler supports reinterpret_cast<>, define # HAVE_REINTERPRET_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_REINTERPRET_CAST], [AX_CXX_REINTERPRET_CAST]) AC_DEFUN([AX_CXX_REINTERPRET_CAST], [AC_CACHE_CHECK(whether the compiler supports reinterpret_cast<>, ax_cv_cxx_reinterpret_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 () {} }; class Unrelated { public : Unrelated () {} }; int g (Unrelated&) { return 0; }],[ Derived d;Base& b=d;Unrelated& e=reinterpret_cast<Unrelated&>(b);return g(e);], ax_cv_cxx_reinterpret_cast=yes, ax_cv_cxx_reinterpret_cast=no) AC_LANG_RESTORE ]) if test "$ax_cv_cxx_reinterpret_cast" = yes; then AC_DEFINE(HAVE_REINTERPRET_CAST,, [define if the compiler supports reinterpret_cast<>]) fi ])
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