You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
24 lines
1.2 KiB
24 lines
1.2 KiB
9 years ago
|
# Test if the input language was specified externally.
|
||
|
|
# Otherwise test if the compiler unterstands the "-std=gnu99" flag, and use it if so.
|
||
|
|
# Otherwise test if the compiler unterstands the "-std=c99" flag, and use it if so.
|
||
|
|
ifeq ($(filter -std=%,$(CFLAGS)),)
|
||
|
|
ifeq ($(shell $(CC) -std=gnu99 -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
|
||
|
|
CFLAGS += -std=gnu99
|
||
|
|
else
|
||
|
|
ifeq ($(shell $(CC) -std=c99 -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
|
||
|
|
CFLAGS += -std=c99
|
||
|
|
endif
|
||
|
|
endif
|
||
|
|
endif
|
||
|
|
|
||
|
|
# Add `-fno-delete-null-pointer-checks` flag iff the compiler supports it.
|
||
|
|
# GCC removes moves tests whether `x == NULL`, if previously `x` or even `x->y` was accessed.
|
||
|
|
# 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
|
||
|
|
endif
|
||
|
|
endif
|