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makefiles/cflags.inc.mk: change optional CFLAGS to 'OPTIONAL_CFLAGS'

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Update the optional flags to use 'OPTIONAL_CFLAGS' instead of evaluating
everytime.

They are now blacklisted by architecture/toolchain according to the
current docker reference image.
This commit is contained in:
Gaëtan Harter 2019-08-28 19:46:47 +02:00
parent 043534daf9
commit 909552e3c0
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GPG Key ID: 76DF6BCF1B1F883B
1 changed files with 7 additions and 23 deletions
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30
makefiles/cflags.inc.mk
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@ -11,37 +11,19 @@ endif
# 0x0 might be a sane memory location for embedded systems, so the test must not be removed.
# Right now clang does not use the *delete-null-pointer* optimization, and does not understand the parameter.
# Related issues: #628, #664.
ifeq ($(shell $(CC) -fno-delete-null-pointer-checks -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
ifeq ($(shell LANG=C $(CC) -fno-delete-null-pointer-checks -E - 2>&1 1>/dev/null </dev/null | grep warning: | grep -- -fno-delete-null-pointer-checks),)
CFLAGS += -fno-delete-null-pointer-checks
OPTIONAL_CFLAGS += -fno-delete-null-pointer-checks
ifneq ($(shell $(CXX) -fno-delete-null-pointer-checks -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
CXXUWFLAGS += -fno-delete-null-pointer-checks
else
ifneq ($(shell LANG=C $(CXX) -fno-delete-null-pointer-checks -E - 2>&1 1>/dev/null </dev/null | grep warning: | grep -- -fno-delete-null-pointer-checks),)
CXXUWFLAGS += -fno-delete-null-pointer-checks
endif
endif
endif
endif
# Template for testing a compiler flag and adding it to CFLAGS (errors usually
# happens when using older toolchains which do not support the given flags)
define cflags_test_and_add
ifeq ($(shell $(CC) -Werror $(1) -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
CFLAGS += $(1)
endif
endef
# Use colored compiler output if the compiler supports this and if this is not
# disabled by the user
ifeq ($(CC_NOCOLOR),0)
$(eval $(call cflags_test_and_add,-fdiagnostics-color))
OPTIONAL_CFLAGS += -fdiagnostics-color
endif
# Fast-out on old style function definitions.
# They cause unreadable error compiler errors on missing semicolons.
# Worse yet they hide errors by accepting wildcard argument types.
$(foreach flag,-Wstrict-prototypes -Wold-style-definition,$(eval $(call cflags_test_and_add,$(flag))))
OPTIONAL_CFLAGS += -Wstrict-prototypes
OPTIONAL_CFLAGS += -Wold-style-definition
# Unwanted flags for c++
CXXUWFLAGS += -std=%
@ -59,7 +41,9 @@ CFLAGS += -fno-common
# Enable all default warnings and all extra warnings
CFLAGS += -Wall -Wextra
# Enable additional checks for printf/scanf format strings
$(foreach flag,-Wformat=2 -Wformat-overflow -Wformat-truncation,$(eval $(call cflags_test_and_add,$(flag))))
OPTIONAL_CFLAGS += -Wformat=2
OPTIONAL_CFLAGS += -Wformat-overflow
OPTIONAL_CFLAGS += -Wformat-truncation
# Warn if a user-supplied include directory does not exist.
CFLAGS += -Wmissing-include-dirs