hdf5/m4/aclocal_cxx.m4

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dnl *********************************
dnl PURPOSE
dnl  Contains Macros for HDF5 C++
dnl *********************************
dnl
dnl Special characteristics that have no autoconf counterpart but that
dnl we need as part of the C++ support.  To distinquish these, they
dnl have a [PAC] prefix.

dnl Checking if C++ needs old style header files in includes

AC_DEFUN([PAC_PROG_CXX_HEADERS],[
  AC_MSG_CHECKING([if $CXX needs old style header files in includes])
  AC_LINK_IFELSE([AC_LANG_SOURCE([
#include <iostream>

int main(void) { return 0; }
  ])],
    [AC_MSG_RESULT([no])],
    [AC_MSG_RESULT([yes])
    CXXFLAGS="${CXXFLAGS} -DOLD_HEADER_FILENAME"
    AM_CXXFLAGS="${AM_CXXFLAGS} -DOLD_HEADER_FILENAME"])
])

dnl Checking if ++ can handle namespaces

AC_DEFUN([PAC_PROG_CXX_NAMESPACE],[
  AC_MSG_CHECKING([if $CXX can handle namespaces])
  AC_LINK_IFELSE([AC_LANG_SOURCE([
namespace H5 {
int fnord;
}

int main(void) {
   using namespace H5;
   fnord = 37;
   return 0;
} 
  ])], [AC_MSG_RESULT([yes])],
     [AC_MSG_RESULT([no])
     CXXFLAGS="${CXXFLAGS} -DH5_NO_NAMESPACE"
     AM_CXXFLAGS="${AM_CXXFLAGS} -DH5_NO_NAMESPACE"])
])

dnl Checking if C++ supports std

AC_DEFUN([PAC_PROG_CXX_STD],[
  AC_MSG_CHECKING([if $CXX supports std])
  AC_LINK_IFELSE([AC_LANG_SOURCE([
#include <string>

using namespace std;

int main(void) {
   string myString("testing namespace std");
   return 0;
}
  ])], [AC_MSG_RESULT([yes])],
     [AC_MSG_RESULT([no])
     CXXFLAGS="${CXXFLAGS} -DH5_NO_STD"
     AM_CXXFLAGS="${AM_CXXFLAGS} -DH5_NO_STD"])
])

dnl Checking if C++ has offsetof extension

AC_DEFUN([PAC_PROG_CXX_OFFSETOF],[
  AC_MSG_CHECKING([if $CXX has offsetof extension])
    AC_LINK_IFELSE([AC_LANG_PROGRAM([
  #include <stdio.h>
  #include <stddef.h>
    ],[
    struct index_st
    {
      unsigned char type;
      unsigned char num;
      unsigned int len;
    };
    typedef struct index_st index_t;
    int x,y;
    x = offsetof(struct index_st, len);
    y = offsetof(index_t, num)
    ])],[AC_MSG_RESULT([yes])
    AC_DEFINE([CXX_HAVE_OFFSETOF], [1], [Define if C++ compiler recognizes offsetof])],
    AC_MSG_RESULT([no]))
])

dnl Checking if C++ can handle static cast

AC_DEFUN([PAC_PROG_CXX_STATIC_CAST],[
  AC_MSG_CHECKING([if $CXX can handle static cast])
  AC_LINK_IFELSE([AC_LANG_SOURCE([
int main(void) {
   float test_float;
   int test_int;
   test_float = 37.0;
   test_int = static_cast <int> (test_float);
   return 0;
}
  ])], [AC_MSG_RESULT([yes])],
    [AC_MSG_RESULT([no])
    CXXFLAGS="${CXXFLAGS} -DNO_STATIC_CAST"
    AM_CXXFLAGS="${AM_CXXFLAGS} -DNO_STATIC_CAST"])
])