[svn-r16306] Description:

	Bring r16305 back from revise_chunks branch:

	Add detection of C99 "designated initializers" to configure script and
use new H5_HAVE_C99_DESIGNATED_INITIALIZER macro to conditionally compile
default layout variables in src/H5Pdcpl.c

	Also, minor code cleanups, etc.

Tested on:
	FreeBSD/32 6.3 (duty) in debug mode
	(Other platforms tested on branch)

1 files changed, 16 insertions, 2 deletions

diff --git a/configure.in b/configure.in
index ff9ded5..ee19951 100644
--- a/configure.in
+++ b/configure.in
@@ -2060,13 +2060,27 @@ AC_TRY_COMPILE(,[int __attribute__((unused)) x],
 AC_MSG_CHECKING([for __func__ extension])
 AC_TRY_COMPILE(,[ const char *fname = __func__; ],
                AC_DEFINE([HAVE_C99_FUNC], [1],
-                         [Define if the compiler understand the __func__ keyword])
+                         [Define if the compiler understands the __func__ keyword])
                AC_MSG_RESULT([yes]),
                AC_MSG_RESULT([no]))
 AC_MSG_CHECKING([for __FUNCTION__ extension])
 AC_TRY_COMPILE(,[ const char *fname = __FUNCTION__; ],
                AC_DEFINE([HAVE_FUNCTION], [1],
-                         [Define if the compiler understand the __FUNCTION__ keyword])
+                         [Define if the compiler understands the __FUNCTION__ keyword])
+               AC_MSG_RESULT([yes]),
+               AC_MSG_RESULT([no]))
+AC_MSG_CHECKING([for C99 designated initialization support])
+AC_TRY_COMPILE(,[
+                typedef struct {
+                    int x;
+                    union {
+                        int i;
+                        double d;
+                    } u;
+                } di_struct_t;
+                di_struct_t x = {0, { .d = 0.0}}; ],
+               AC_DEFINE([HAVE_C99_DESIGNATED_INITIALIZER], [1],
+                         [Define if the compiler understands C99 designated initialization of structs and unions])
                AC_MSG_RESULT([yes]),
                AC_MSG_RESULT([no]))