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-rw-r--r--mach/Makefile3
1 files changed, 2 insertions, 1 deletions
diff --git a/mach/Makefile b/mach/Makefile
index 7e32034bc4..444c2ed144 100644
--- a/mach/Makefile
+++ b/mach/Makefile
@@ -72,7 +72,8 @@ $(objpfx)mach-syscalls.mk: syscalls.awk Makefile
 	$(make-target-directory)
 	echo '#include <mach/syscall_sw.h>' | \
 	DEPENDENCIES_OUTPUT='$@-dep $@' \
-	$(CC) $(CPPFLAGS) -E -x c-header - \
+# We must use $(CFLAGS) to get -O flags that affect #if's in header files.
+	$(CC) $(CFLAGS) $(CPPFLAGS) -E -x c-header - \
 	      -D_MACH_`echo $(base-machine) | tr a-z A-Z`_SYSCALL_SW_H_=1 | \
 	sed -n -e 's/^kernel_trap(\(.*\),\([-0-9]*\),\([0-9]*\))$$/\1 \2 \3/p'\
 	| $(AWK) -f $< > $@-new