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cc makefile: enable -ffunction-sections and -fdata-sections

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These compiler options place each function and each global variable
into its own ELF section in each .o file.  This, combined with the
linker option --gc-sections allows the linker to evict unused functions
and variables from the final ELF file.

On CC, the firmware flash bank is only 118784 bytes in total.

This commit reduces the .text segment from 114120 to 83536 and .data
from 572 bytes to 560 bytes.  That frees up a grand total of 30596 bytes
of flash and 12 bytes of RAM.
This commit is contained in:
Stacey Sheldon 2012-08-11 20:13:09 -04:00
parent bbe86332de
commit 9f8d22961f
1 changed files with 1 additions and 0 deletions
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flight/CopterControl/Makefile
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@ -503,6 +503,7 @@ endif
CFLAGS += -Wall
CFLAGS += -Werror
CFLAGS += -ffunction-sections -fdata-sections
CFLAGS += -Wa,-adhlns=$(addprefix $(OUTDIR)/, $(notdir $(addsuffix .lst, $(basename $<))))
# Compiler flags to generate dependency files:
CFLAGS += -MD -MP -MF $(OUTDIR)/dep/$(@F).d