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py/py.mk: Use additional CFLAGS to compile string0.c. 

Otherwise functions like memset might get optimised to call themselves (eg
with gcc 10).  And provide CFLAGS_BUILTIN so these options can be changed
by a port if needed.

Fixes issue #6053.
This commit is contained in:
Damien George 2020-05-21 11:27:09 +10:00
parent 4bbba3060d
commit a902b69dd5
1 changed files with 5 additions and 0 deletions
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py/py.mk
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@ -266,6 +266,11 @@ $(HEADER_BUILD)/moduledefs.h: $(SRC_QSTR) $(QSTR_GLOBAL_DEPENDENCIES) | $(HEADER
SRC_QSTR += $(HEADER_BUILD)/moduledefs.h
# Standard C functions like memset need to be compiled with special flags so
# the compiler does not optimise these functions in terms of themselves.
CFLAGS_BUILTIN ?= -ffreestanding -fno-builtin -fno-lto
$(BUILD)/lib/libc/string0.o: CFLAGS += $(CFLAGS_BUILTIN)
# Force nlr code to always be compiled with space-saving optimisation so
# that the function preludes are of a minimal and predictable form.
$(PY_BUILD)/nlr%.o: CFLAGS += -Os