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Makefile.flags: suppress some clang-9 warnings

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2019-10-25 12:56:51 +02:00
parent af7169b4a7
commit b4ef2e3467
1 changed files with 22 additions and 3 deletions
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25
Makefile.flags
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@ -47,12 +47,28 @@ endif
# gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)
CFLAGS += $(call cc-option,-fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,)
ifneq ($(CC),clang)
# "clang-9: warning: optimization flag '-finline-limit=0' is not supported
CFLAGS += $(call cc-option,-finline-limit=0,)
endif
CFLAGS += $(call cc-option,-fno-builtin-strlen -fomit-frame-pointer -ffunction-sections -fdata-sections,)
# -fno-guess-branch-probability: prohibit pseudo-random guessing
# of branch probabilities (hopefully makes bloatcheck more stable):
CFLAGS += $(call cc-option,-fno-guess-branch-probability,)
CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,)
CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,)
CFLAGS += $(call cc-option,-funsigned-char,)
ifneq ($(CC),clang)
# "clang-9: warning: argument unused during compilation: '-static-libgcc'"
CFLAGS += $(call cc-option,-static-libgcc,)
endif
CFLAGS += $(call cc-option,-falign-functions=1,)
ifneq ($(CC),clang)
# "clang-9: warning: optimization flag '-falign-jumps=1' is not supported" (and same for other two)
CFLAGS += $(call cc-option,-falign-jumps=1 -falign-labels=1 -falign-loops=1,)
endif
# Defeat .eh_frame bloat (gcc 4.6.3 x86-32 defconfig: 20% smaller busybox binary):
CFLAGS += $(call cc-option,-fno-unwind-tables,)
CFLAGS += $(call cc-option,-fno-asynchronous-unwind-tables,)
@ -60,6 +76,9 @@ CFLAGS += $(call cc-option,-fno-asynchronous-unwind-tables,)
# (try disabling this and comparing assembly, it's instructive)
CFLAGS += $(call cc-option,-fno-builtin-printf,)
# clang-9 does not like "str" + N and "if (CONFIG_ITEM && cond)" constructs
CFLAGS += $(call cc-option,-Wno-string-plus-int -Wno-constant-logical-operand)
# FIXME: These warnings are at least partially to be concerned about and should
# be fixed..
#CFLAGS += $(call cc-option,-Wconversion,)