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--- a/mpy-cross/Makefile
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+++ b/mpy-cross/Makefile
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@@ -19,7 +19,7 @@ INC += -I$(TOP)
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# compiler settings
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CWARN = -Wall -Werror
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CWARN += -Wextra -Wno-unused-parameter -Wpointer-arith
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-CFLAGS = $(INC) $(CWARN) -std=gnu99 $(CFLAGS_MOD) $(COPT) $(CFLAGS_EXTRA)
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+CFLAGS += $(INC) $(CWARN) -std=gnu99 $(CFLAGS_MOD) $(COPT) $(CFLAGS_EXTRA)
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CFLAGS += -fdata-sections -ffunction-sections -fno-asynchronous-unwind-tables
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# Debugging/Optimization
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@@ -42,7 +42,7 @@ else
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# Use gcc syntax for map file
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LDFLAGS_ARCH = -Wl,-Map=$@.map,--cref -Wl,--gc-sections
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endif
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-LDFLAGS = $(LDFLAGS_MOD) $(LDFLAGS_ARCH) -lm $(LDFLAGS_EXTRA)
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+LDFLAGS += $(LDFLAGS_MOD) $(LDFLAGS_ARCH) -lm $(LDFLAGS_EXTRA)
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# source files
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SRC_C = \
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