[avr-libc-dev] Linker size check by adding export symbols

[Sebastian Brückner]

Hi all,

I wanted to have automatic size checking of the .data segement. I tried 
to modify gcrt1.S as I saw in an older message 
<https://lists.gnu.org/archive/html/avr-libc-dev/2016-03/msg00003.html>.

See patch below. Is this the right way to do it?

Index: avr-libc/crt1/gcrt1.S
===================================================================
--- avr-libc/crt1/gcrt1.S       (Revision 2544)
+++ avr-libc/crt1/gcrt1.S       (Arbeitskopie)
@@ -379,5 +379,19 @@
   values are picked up from the device header file.
   */

+  .weak __TEXT_REGION_LENGTH__
+  .set __TEXT_REGION_LENGTH__, FLASHEND
+
+  /* The data size check does not work on devices that support
+  external SRAM since XRAMEND will be defined to 0xFFFF in that case.
+  Linker scripts have start of .data section hardcoded to 0x60,
+  RAMSTART is not used.
+  */
+  .weak __DATA_REGION_LENGTH__
+  .set __DATA_REGION_LENGTH__, (XRAMEND - 0x60)
+
+  .weak __EEPROM_REGION_LENGTH__
+  .set __EEPROM_REGION_LENGTH__, E2END
+
   .weak __FUSE_REGION_LENGTH__
   .set __FUSE_REGION_LENGTH__, FUSE_MEMORY_SIZE


Best regards
Sebastian