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This patch modifies the newlib and Contiki C and C++ compiler flags to omit exception handling unwind tables (see http://wiki.dwarfstd.org/index.php?title=Exception_Handling). Removing these tables saves space in debug builds and has not caused any readily-apparent functional changes. Here is the size listing for an example program built without this patch: text data bss dec hex filename 76002 1508 21224 98734 181ae all-timers.galileo Here is the size listing for the same program with this patch: text data bss dec hex filename 72918 1508 21224 95650 175a2 all-timers.galileo The primary motivation for this patch is to help enable UEFI support. The .eh_frame and .eh_frame_hdr sections that are otherwise generated are treated as code sections by the EDK2 GenFw program, since they are read-only alloc sections. They get grouped with the actual code sections, ahead of the data sections. This perturbs symbols and complicates debugging.
The Contiki Operating System
Contiki is an open source operating system that runs on tiny low-power microcontrollers and makes it possible to develop applications that make efficient use of the hardware while providing standardized low-power wireless communication for a range of hardware platforms.
Contiki is used in numerous commercial and non-commercial systems, such as city sound monitoring, street lights, networked electrical power meters, industrial monitoring, radiation monitoring, construction site monitoring, alarm systems, remote house monitoring, and so on.
For more information, see the Contiki website: