[svn-r13864] Purpose: Adding a new macro, H5_HAVE_OFFSETOF.

Description:  When the compiler has the __offsetof__ extension, the H5_HAVE_OFFSETOF
              macro will be defined. When the compiler does not have the extension,
              the macro will remain undefined.

Tested: kagiso

3 files changed, 62 insertions, 1 deletions

diff --git a/configure b/configure
index 3c1008b..529a0e7 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Id: configure.in 13812 2007-05-29 19:48:53Z koziol .
+# From configure.in Id: configure.in 13828 2007-06-01 19:28:10Z slu .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61 for HDF5 1.6.6-snap21.
 #
@@ -34067,6 +34067,57 @@ fi
 
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
+{ echo "$as_me:$LINENO: checking for __offsetof__ extension" >&5
+echo $ECHO_N "checking for __offsetof__ extension... $ECHO_C" >&6; }
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+int
+main ()
+{
+size_t __offsetof__(unused)
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (ac_try="$ac_compile"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_compile") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest.$ac_objext; then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_OFFSETOF 1
+_ACEOF
+
+               { echo "$as_me:$LINENO: result: yes" >&5
+echo "${ECHO_T}yes" >&6; }
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	{ echo "$as_me:$LINENO: result: no" >&5
+echo "${ECHO_T}no" >&6; }
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
 { echo "$as_me:$LINENO: checking how to print long long" >&5
 echo $ECHO_N "checking how to print long long... $ECHO_C" >&6; }
 if test "${hdf5_cv_printf_ll+set}" = set; then
diff --git a/configure.in b/configure.in
index ead1448..81369a3 100644
--- a/configure.in
+++ b/configure.in
@@ -1660,6 +1660,13 @@ AC_TRY_COMPILE(,[(void)__FUNCTION__],
                AC_MSG_RESULT([yes]),
                AC_MSG_RESULT([no]))
 
+AC_MSG_CHECKING([for __offsetof__ extension])
+AC_TRY_COMPILE(,[size_t __offsetof__(unused)],
+               AC_DEFINE([HAVE_OFFSETOF], [1],
+                         [Define if the __offsetof__ extension is present])
+               AC_MSG_RESULT([yes]),
+               AC_MSG_RESULT([no]))
+
 dnl ----------------------------------------------------------------------
 dnl Try to figure out how to print `long long'.  Some machines use `%lld'
 dnl and others use `%qd'.  There may be more!  The final `l' is a
diff --git a/src/H5config.h.in b/src/H5config.h.in
index c34a7c0..0802ada 100644
--- a/src/H5config.h.in
+++ b/src/H5config.h.in
@@ -228,6 +228,9 @@
 /* Define to 1 if you have the <netinet/tcp.h> header file. */
 #undef HAVE_NETINET_TCP_H
 
+/* Define if the __offsetof__ extension is present */
+#undef HAVE_OFFSETOF
+
 /* Define if we have parallel support */
 #undef HAVE_PARALLEL