Fix dependency generation for older gcc versions

 With gcc 3.3.3 at least, compilation fails with

Generating include/autoconf.mk
gcc: compilation of header file requested
make: *** [include/autoconf.mk] Error 1

since commit 16fe77752eee099b9fb61ed73460e51cc94b37ba.

Signed-off-by: Vlad Lungu <vlad@comsys.ro>

diff --git a/Makefile b/Makefile
index e56889e22834e9442a41d3800f0ae556388239af..ff33b4cec0bede908700a3b6b51d1e0e57ef09ca 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -432,7 +432,7 @@ $(obj)include/autoconf.mk: $(obj)include/config.h $(VERSION_FILE)
        @$(XECHO) Generating include/autoconf.mk ; \
        set -e ; \
        : Generate the dependancies ; \
-       $(CC) -M $(HOST_CFLAGS) $(CPPFLAGS) -MQ $@ include/common.h > $@.dep ; \
+       $(CC) -x c -M $(HOST_CFLAGS) $(CPPFLAGS) -MQ $@ include/common.h > $@.dep ; \
        : Extract the config macros ; \
        $(CPP) $(CFLAGS) -dM include/common.h | sed -n -f tools/scripts/define2mk.sed > $@