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This patch adds -ffunction-sections and -fdata-sections to the 'release' CFLAGS so each function and data is place into its own section in the output file. It also adds --gc-section to the 'release' LDFLAGS so the linker removes the sections which are not referenced. This patch also adds -ffunction-sections and -fdata-sections options to CFLAGS from build_newlib.sh. This increases newlib static libraries size, however, the Contiki image shrinks even more since --gc-section removes "dead code" from newlib. As a practical effect, all unused function and data (as well as sections such as .eh_frame) are striped out from the final elf binary. This shrinks our release binary drastically. Finally, to prevent --gc-section from removing .multiboot section, this patch adds KEEP(*(.multiboot)) to quarkX1000.ld.
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: