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Compile with -ffunction-sectons -fdata-sections, link with -gc-sections

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This seems to shrink code size by abou 3.5%. Not sure if there are any downsides.
This commit is contained in:
Angus Gratton 2015-08-27 16:47:38 +10:00
parent 1cbb34b9ab
commit 464359ea66
1 changed files with 11 additions and 0 deletions
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11
common.mk
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@ -94,14 +94,25 @@ OWN_LIBC ?= 1
# Note: you will need a recent esp # Note: you will need a recent esp
ENTRY_SYMBOL ?= call_user_start ENTRY_SYMBOL ?= call_user_start
# Set this to zero if you don't want individual function & data sections
# (some code may be slightly slower, linking will be slighty slower,
# but compiled code size will come down a small amount.)
SPLIT_SECTIONS ?= 1
# Common flags for both C & C++_ # Common flags for both C & C++_
C_CXX_FLAGS = -Wall -Werror -Wl,-EL -nostdlib -mlongcalls -mtext-section-literals $(CPPFLAGS) C_CXX_FLAGS = -Wall -Werror -Wl,-EL -nostdlib -mlongcalls -mtext-section-literals $(CPPFLAGS)
# Flags for C only # Flags for C only
CFLAGS = $(C_CXX_FLAGS) -std=gnu99 CFLAGS = $(C_CXX_FLAGS) -std=gnu99
# Flags for C++ only # Flags for C++ only
CXXFLAGS = $(C_CXX_FLAGS) -fno-exceptions -fno-rtti CXXFLAGS = $(C_CXX_FLAGS) -fno-exceptions -fno-rtti
LDFLAGS = -nostdlib -Wl,--no-check-sections -Wl,-L$(BUILD_DIR)sdklib -Wl,-L$(ROOT)lib -u $(ENTRY_SYMBOL) -Wl,-static -Wl,-Map=build/${PROGRAM}.map $(EXTRA_LDFLAGS) LDFLAGS = -nostdlib -Wl,--no-check-sections -Wl,-L$(BUILD_DIR)sdklib -Wl,-L$(ROOT)lib -u $(ENTRY_SYMBOL) -Wl,-static -Wl,-Map=build/${PROGRAM}.map $(EXTRA_LDFLAGS)
ifeq ($(SPLIT_SECTIONS),1)
C_CXX_FLAGS += -ffunction-sections -fdata-sections
LDFLAGS += -Wl,-gc-sections
endif
ifeq ($(FLAVOR),debug) ifeq ($(FLAVOR),debug)
C_CXX_FLAGS += -g -O0 C_CXX_FLAGS += -g -O0
LDFLAGS += -g -O0 LDFLAGS += -g -O0