git.m6w6.name Git - awesomized/libmemcached/blob - m4/pandora_shared_ptr.m4

   1 dnl  Copyright (C) 2009 Sun Microsystems
   2 dnl This file is free software; Sun Microsystems
   3 dnl gives unlimited permission to copy and/or distribute it,
   4 dnl with or without modifications, as long as this notice is preserved.
   5
   6 dnl We check two things: where is the memory include file, and in what
   7 dnl namespace does shared_ptr reside.
   8 dnl We include AC_COMPILE_IFELSE for all the combinations we've seen in the
   9 dnl wild:
  10 dnl
  11 dnl  GCC 4.3: namespace: std::  #include <memory>
  12 dnl  GCC 4.2: namespace: tr1::  #include <tr1/memory>
  13 dnl  GCC 4.2: namespace: boost::  #include <boost/shared_ptr.hpp>
  14 dnl
  15 dnl We define one of HAVE_HAVE_TR1_SHARED_PTR or HAVE_BOOST_SHARED_PTR
  16 dnl depending on location, and SHARED_PTR_NAMESPACE to be the namespace in
  17 dnl which shared_ptr is defined.
  18 dnl
  19
  20 AC_DEFUN([PANDORA_SHARED_PTR],[
  21   AC_REQUIRE([PANDORA_CHECK_CXX_STANDARD])
  22   AC_LANG_PUSH(C++)
  23   save_CXXFLAGS="${CXXFLAGS}"
  24   CXXFLAGS="${CXX_STANDARD} ${CXXFLAGS}"
  25   AC_CHECK_HEADERS(memory tr1/memory boost/shared_ptr.hpp)
  26   AC_CACHE_CHECK([the location of shared_ptr header file],
  27     [ac_cv_shared_ptr_h],[
  28       for namespace in std tr1 std::tr1 boost
  29       do
  30         AC_COMPILE_IFELSE(
  31           [AC_LANG_PROGRAM([[
  32 #if defined(HAVE_MEMORY)
  33 # include <memory>
  34 #endif
  35 #if defined(HAVE_TR1_MEMORY)
  36 # include <tr1/memory>
  37 #endif
  38 #if defined(HAVE_BOOST_SHARED_PTR_HPP)
  39 # include <boost/shared_ptr.hpp>
  40 #endif
  41 #include <string>
  42
  43 using $namespace::shared_ptr;
  44 using namespace std;
  45             ]],[[
  46 shared_ptr<string> test_ptr(new string("test string"));
  47             ]])],
  48             [
  49               ac_cv_shared_ptr_namespace="${namespace}"
  50               break
  51             ],[ac_cv_shared_ptr_namespace=missing])
  52        done
  53   ])
  54   AC_DEFINE_UNQUOTED([SHARED_PTR_NAMESPACE],
  55                      ${ac_cv_shared_ptr_namespace},
  56                      [The namespace in which SHARED_PTR can be found])
  57   CXXFLAGS="${save_CXXFLAGS}"
  58   AC_LANG_POP()
  59 ])