[PATCH] Allow BUILD_CFLAGS and TARGET_CFLAGS to be specified at configure time

[Simon Horman]

I have applied the following:

From: Jeremy Kerr <jk at ozlabs.org>

Currently, we're unconditionally setting the build and target cflags in
the configure script, which means that they can't be easily
overwritten.

This change conditionally sets these variables if they're not specified
during configure, allowing something like:

BUILD_CFLAGS=-Werror ./configure

Signed-off-by: Jeremy Kerr <jk at ozlabs.org>
Signed-off-by: Simon Horman <horms at verge.net.au>

---
 configure.ac |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 5f1c15a..fa5330a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -56,8 +56,13 @@ if test "${host_alias}" ; then
 	OBJDIR="$OBJDIR-${host_alias}"
 fi
 
-BUILD_CFLAGS='-O2 -Wall'
-TARGET_CFLAGS='-O2 -Wall'
+if test "x$BUILD_CFLAGS" = "x" ; then
+	BUILD_CFLAGS='-O2 -Wall'
+fi
+
+if test "x$TARGET_CFLAGS" = "x" ; then
+	TARGET_CFLAGS='-O2 -Wall'
+fi
 
 AC_ARG_WITH([objdir], AC_HELP_STRING([--with-objdir=<dir>],[select directory for object files]),
 	[ OBJDIR="$withval" ], [ OBJDIR="$OBJDIR" ])

diff --git a/util/Makefile b/util/Makefile
index a1a78ac..948ee63 100644
--- a/util/Makefile
+++ b/util/Makefile
@@ -5,7 +5,7 @@ $(BIN_TO_HEX): $(srcdir)/util/bin-to-hex.c
 	$(LINK.o) $(CFLAGS) -o $@ $^
 
 $(BIN_TO_HEX): CC=$(BUILD_CC)
-$(BIN_TO_HEX): CFLAGS+=$(BUILD_CFLAGS)
+$(BIN_TO_HEX): CFLAGS=$(BUILD_CFLAGS)
 $(BIN_TO_HEX): LDFLAGS=
 
 dist += util/Makefile util/bin-to-hex.c