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Optimise flags #162

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Optimise flags #162

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aeb3967
Add maximum debugging info to ELF; doesn't affect binary size
paulfertser Dec 18, 2017
5751bb2
Disable RTTI and exceptions by default
paulfertser Dec 18, 2017
403e22b
Add cross-reference to the map file
paulfertser Dec 18, 2017
5fbd6ba
Optionally build with LTO
paulfertser Dec 18, 2017
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15 changes: 10 additions & 5 deletions examples/rules.mk
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Original file line number Diff line number Diff line change
Expand Up @@ -43,7 +43,11 @@ STYLECHECK := /checkpatch.pl
STYLECHECKFLAGS := --no-tree -f --terse --mailback
STYLECHECKFILES := $(shell find . -name '*.[ch]')
OPT := -Os
ifeq ($(LTO),1)
OPT += -flto
endif
CSTD ?= -std=c99
DEBUG := -ggdb3


###############################################################################
Expand Down Expand Up @@ -98,7 +102,7 @@ EXAMPLES_SCRIPT_DIR = $(OPENCM3_DIR)/../scripts
###############################################################################
# C flags

TGT_CFLAGS += $(OPT) $(CSTD) -g
TGT_CFLAGS += $(OPT) $(CSTD) $(DEBUG)
TGT_CFLAGS += $(ARCH_FLAGS)
TGT_CFLAGS += -Wextra -Wshadow -Wimplicit-function-declaration
TGT_CFLAGS += -Wredundant-decls -Wmissing-prototypes -Wstrict-prototypes
Expand All @@ -107,10 +111,11 @@ TGT_CFLAGS += -fno-common -ffunction-sections -fdata-sections
###############################################################################
# C++ flags

TGT_CXXFLAGS += $(OPT) $(CXXSTD) -g
TGT_CXXFLAGS += $(OPT) $(CXXSTD) $(DEBUG)
TGT_CXXFLAGS += $(ARCH_FLAGS)
TGT_CXXFLAGS += -Wextra -Wshadow -Wredundant-decls -Weffc++
TGT_CXXFLAGS += -fno-common -ffunction-sections -fdata-sections
TGT_CXXFLAGS += -fno-exceptions -fno-rtti

###############################################################################
# C & C++ preprocessor common flags
Expand All @@ -124,8 +129,8 @@ TGT_CPPFLAGS += $(DEFS)

TGT_LDFLAGS += --static -nostartfiles
TGT_LDFLAGS += -T$(LDSCRIPT)
TGT_LDFLAGS += $(ARCH_FLAGS)
TGT_LDFLAGS += -Wl,-Map=$(*).map
TGT_LDFLAGS += $(ARCH_FLAGS) $(DEBUG)
TGT_LDFLAGS += -Wl,-Map=$(*).map -Wl,--cref
TGT_LDFLAGS += -Wl,--gc-sections
ifeq ($(V),99)
TGT_LDFLAGS += -Wl,--print-gc-sections
Expand Down Expand Up @@ -193,7 +198,7 @@ print-%:

%.elf %.map: $(OBJS) $(LDSCRIPT)
@#printf " LD $(*).elf\n"
$(Q)$(LD) $(TGT_LDFLAGS) $(LDFLAGS) $(OBJS) $(LDLIBS) -o $(*).elf
$(Q)$(LD) $(OPT) $(TGT_LDFLAGS) $(LDFLAGS) $(OBJS) $(LDLIBS) -o $(*).elf

%.o: %.c
@#printf " CC $(*).c\n"
Expand Down