Eliminate 'value of DATASTART2 unknown' cppcheck info messages

* dyn_load.c [HAVE_DL_ITERATE_PHDR]
(GC_register_dynamic_libraries_dl_iterate_phdr): Replace
defined(DATASTART2) with defined(GC_HAVE_DATAREGION2).
* os_dep.c [!OS2 && !MSWIN32 && !OPENBSD] (GC_register_data_segments):
Likewise.
* include/private/gcconfig.h [DATASTART2] (GC_HAVE_DATAREGION2): New
macro.

1 files changed, 1 insertions, 1 deletions

diff --git a/dyn_load.c b/dyn_load.c
index 1174396a..679211dd 100644
--- a/dyn_load.c
+++ b/dyn_load.c
@@ -628,7 +628,7 @@ STATIC GC_bool GC_register_dynamic_libraries_dl_iterate_phdr(void)
       /* dl_iterate_phdr may forget the static data segment in  */
       /* statically linked executables.                         */
       GC_add_roots_inner(datastart, dataend, TRUE);
-#     if defined(DATASTART2)
+#     ifdef GC_HAVE_DATAREGION2
         if ((word)DATASTART2 - 1U >= (word)DATAEND2) {
                         /* Subtract one to check also for NULL  */
                         /* without a compiler warning.          */