From 3f37d67b3ca8f6693400a2d266753aaae63ded93 Mon Sep 17 00:00:00 2001
From: Scot Breitenfeld <brtnfld@hdfgroup.org>
Date: Wed, 20 Jul 2016 11:10:42 -0500
Subject: [svn-r30209] HDFFV-9467: Use the same test programs for CMake and
 autotools    -- Modified C++ to use the same test programs.

Tested: jelly (gnu)
---
 configure.ac      |  8 ++++---
 m4/aclocal_cxx.m4 | 68 ++++++++++++-------------------------------------------
 2 files changed, 19 insertions(+), 57 deletions(-)

diff --git a/configure.ac b/configure.ac
index 5ba01c6..a6d1192 100644
--- a/configure.ac
+++ b/configure.ac
@@ -695,12 +695,14 @@ if test "X$HDF_CXX" = "Xyes"; then
   ## Checking if C++ can handle namespaces
   PAC_PROG_CXX_NAMESPACE
 
-  ## Checking if C++ has offsetof extension
-  PAC_PROG_CXX_OFFSETOF
-
   ## if C++ can handle static cast
   PAC_PROG_CXX_STATIC_CAST
 
+  ## Checking if C++ has offsetof extension, 
+  ## note: this test has to be the last of the C++ tests because it sets a definition
+  ## which would be used in the other tests, causing them to fail.
+  PAC_PROG_CXX_OFFSETOF
+
 else
   AC_MSG_RESULT([no])
   CXX="no"
diff --git a/m4/aclocal_cxx.m4 b/m4/aclocal_cxx.m4
index b44ae82..9d47193 100644
--- a/m4/aclocal_cxx.m4
+++ b/m4/aclocal_cxx.m4
@@ -26,14 +26,11 @@ 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>
+  TEST_SRC="`(echo \"#define OLD_HEADER_FILENAME 1\"; cat $srcdir/config/cmake_ext_mod/HDFCXXTests.cpp)`"
 
-int main(void) { return 0; }
-  ])],
+  AC_LINK_IFELSE([AC_LANG_SOURCE([$TEST_SRC])],
     [AC_MSG_RESULT([no])],
     [AC_MSG_RESULT([yes])
     CXXFLAGS="${CXXFLAGS} -DOLD_HEADER_FILENAME"
@@ -41,80 +38,43 @@ int main(void) { return 0; }
 ])
 
 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;
-}
+  TEST_SRC="`(echo \"#define HDF_NO_NAMESPACE 1\"; cat $srcdir/config/cmake_ext_mod/HDFCXXTests.cpp)`"
 
-int main(void) {
-   using namespace H5;
-   fnord = 37;
-   return 0;
-} 
-  ])], [AC_MSG_RESULT([yes])],
+  AC_LINK_IFELSE([AC_LANG_SOURCE([$TEST_SRC])], [AC_MSG_RESULT([yes])],
      [AC_MSG_RESULT([no])
-     CXXFLAGS="${CXXFLAGS} -DH5_NO_NAMESPACE"
-     AM_CXXFLAGS="${AM_CXXFLAGS} -DH5_NO_NAMESPACE"])
+     CXXFLAGS="${CXXFLAGS} -DHDF_NO_NAMESPACE"
+     AM_CXXFLAGS="${AM_CXXFLAGS} -DHDF_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;
+  TEST_SRC="`(echo \"#define HDF_NO_STD 1\"; cat $srcdir/config/cmake_ext_mod/HDFCXXTests.cpp)`"
 
-int main(void) {
-   string myString("testing namespace std");
-   return 0;
-}
-  ])], [AC_MSG_RESULT([yes])],
+  AC_LINK_IFELSE([AC_LANG_SOURCE([$TEST_SRC])], [AC_MSG_RESULT([yes])],
      [AC_MSG_RESULT([no])
      CXXFLAGS="${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])
+  TEST_SRC="`(echo \"#define CXX_HAVE_OFFSETOF 1\"; cat $srcdir/config/cmake_ext_mod/HDFCXXTests.cpp)`"
+
+  AC_LINK_IFELSE([AC_LANG_SOURCE([$TEST_SRC])],[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])],
+  TEST_SRC="`(echo \"#define NO_STATIC_CAST 1\"; cat $srcdir/config/cmake_ext_mod/HDFCXXTests.cpp)`"
+
+  AC_LINK_IFELSE([AC_LANG_SOURCE([$TEST_SRC])], [AC_MSG_RESULT([yes])],
     [AC_MSG_RESULT([no])
     CXXFLAGS="${CXXFLAGS} -DNO_STATIC_CAST"
     AM_CXXFLAGS="${AM_CXXFLAGS} -DNO_STATIC_CAST"])
-- 
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