diff options
| author | Mike Frysinger <vapier@gentoo.org> | 2009-02-26 03:30:06 -0500 |
|---|---|---|
| committer | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2009-02-27 20:38:55 +0200 |
| commit | a2d010f8fca904fffa3c6e5a5d148cc96a37a08a (patch) | |
| tree | e27779a22c717dede2a714d87c248e77b7f15edd | |
| parent | 48e82adf39ba4c93068bc22237a2725a68a8f6c6 (diff) | |
make sure compiler supports warning flags
Some compilers (like gcc-3.3) don't support all the newer -W flags that we
are using. So import the compiler check found in the kernel and test each
flag we add. The := is important so we only do the compiler tests once
per `make` rather than every time we compile a file.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
| -rw-r--r-- | common.mk | 12 |
1 files changed, 11 insertions, 1 deletions
@@ -1,8 +1,18 @@ CC := $(CROSS)gcc AR := $(CROSS)ar RANLIB := $(CROSS)ranlib + +# Stolen from Linux build system +try-run = $(shell set -e; ($(1)) >/dev/null 2>&1 && echo "$(2)" || echo "$(3)") +cc-option = $(call try-run, $(CC) $(1) -c -xc /dev/null -o /dev/null,$(1),$(2)) + CFLAGS ?= -O2 -g -CFLAGS += -Wall -Wextra -Wwrite-strings -Wno-sign-compare -D_FILE_OFFSET_BITS=64 +WFLAGS := -Wall \ + $(call cc-option,-Wextra) \ + $(call cc-option,-Wwrite-strings) \ + $(call cc-option,-Wno-sign-compare) +CFLAGS += $(WFLAGS) +CPPFLAGS += -D_FILE_OFFSET_BITS=64 DESTDIR ?= /usr/local PREFIX=/usr |