文件操作 - ax_cxx_explicit_instantiations.m4
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文件: /usr/share/aclocal/ax_cxx_explicit_instantiations.m4
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# =================================================================================== # https://www.gnu.org/software/autoconf-archive/ax_cxx_explicit_instantiations.html # =================================================================================== # # SYNOPSIS # # AX_CXX_EXPLICIT_INSTANTIATIONS # # DESCRIPTION # # If the C++ compiler supports explicit instanciations syntax, define # HAVE_INSTANTIATIONS. # # 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_EXPLICIT_INSTANTIATIONS], [AX_CXX_EXPLICIT_INSTANTIATIONS]) AC_DEFUN([AX_CXX_EXPLICIT_INSTANTIATIONS], [AC_CACHE_CHECK(whether the compiler supports explicit instantiations, ax_cv_cxx_explinst, [AC_LANG_SAVE AC_LANG_CPLUSPLUS AC_TRY_COMPILE([template <class T> class A { T t; }; template class A<int>;], [], ax_cv_cxx_explinst=yes, ax_cv_cxx_explinst=no) AC_LANG_RESTORE ]) if test "$ax_cv_cxx_explinst" = yes; then AC_DEFINE(HAVE_INSTANTIATIONS,, [define if the compiler supports explicit instantiations]) fi ])
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