[rtems-tools commit] linkers: Fix for targets with a small-data area

[Sebastian Huber]

Module:    rtems-tools
Branch:    master
Commit:    f027f37661fc8c12ab07f92982f0c86e4e0717de
Changeset: http://git.rtems.org/rtems-tools/commit/?id=f027f37661fc8c12ab07f92982f0c86e4e0717de

Author:    Sebastian Huber <sebastian.huber at embedded-brains.de>
Date:      Mon Jan  4 11:15:37 2016 +0100

linkers: Fix for targets with a small-data area

On certain targets (e.g. PowerPC) global data below a certain threshold
(e.g. 8 bytes) may resided in a special memory area, the small-data
area.  This allows more efficient load/store operations.  Placing such
data into the wrong section (e.g. .rodata) leads to relocation errors
during link-time.  See test program libtests/dl02 in the RTEMS
testsuite.  Using an array of unspecified size prevents that the
compiler assumes that a certain variable is in the small-data area.

---

 linkers/rtems-syms.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/linkers/rtems-syms.cpp b/linkers/rtems-syms.cpp
index 97315ac..f0ffe94 100644
--- a/linkers/rtems-syms.cpp
+++ b/linkers/rtems-syms.cpp
@@ -60,7 +60,7 @@ static const char* c_header[] =
   " */",
   "",
   "extern const unsigned char rtems__rtl_base_globals[];",
-  "extern const unsigned int rtems__rtl_base_globals_size;",
+  "extern const unsigned int rtems__rtl_base_globals_size[];",
   "",
   "void rtems_rtl_base_sym_global_add (const unsigned char* , unsigned int );",
   "",
@@ -105,7 +105,7 @@ static const char* c_rtl_call_body[] =
 {
   "{",
   "  rtems_rtl_base_sym_global_add (&rtems__rtl_base_globals[0],",
-  "                                 rtems__rtl_base_globals_size);",
+  "                                 rtems__rtl_base_globals_size[0]);",
   "}",
   0
 };