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-rw-r--r--mach/Machrules3
1 files changed, 2 insertions, 1 deletions
diff --git a/mach/Machrules b/mach/Machrules
index 90a7fcbae5..c575862d83 100644
--- a/mach/Machrules
+++ b/mach/Machrules
@@ -135,7 +135,8 @@ $(patsubst %,$(objpfx)%.udeps,$(user-interfaces)):
$(objpfx)%.udeps: $(..)mach/Machrules
$(make-target-directory)
$(include-%.defs) | \
- $(CC) $(CPPFLAGS) -M -x c - | \
+# We must use $(CFLAGS) to get -O flags that affect #if's in header files.
+ $(CC) $(CFLAGS) $(CPPFLAGS) -M -x c - | \
sed -e 's,- *:,$@ $(@:.udeps=.ustamp) $(@:.udeps=.uh) $(@:.udeps=.__h)\
$(@:.udeps=_server.c) $(@:.udeps=_server.h):,' \
$(sed-remove-objpfx) > $@.new