[PATCH] build-sys: invoke ninja with -d keepdepfile

[Paolo Bonzini]

After reading the dependency file, ninja just deletes it, in the name
of cleanliness I guess.  However this complicates debugging unnecessarily
compared to good old "-include *.d".  Use the keepdepfile debugging
option to make it easier to see what is going on.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index d7fb6b270e..bcbbec71a1 100644
--- a/Makefile
+++ b/Makefile
@@ -149,7 +149,7 @@ $(ninja-targets): run-ninja
 # --output-sync line.
 run-ninja: config-host.mak
 ifneq ($(filter $(ninja-targets), $(ninja-cmd-goals)),)
-       +$(quiet-@)$(if $(MAKE.nq),@:, $(NINJA) \
+       +$(quiet-@)$(if $(MAKE.nq),@:, $(NINJA) -d keepdepfile \
           $(NINJAFLAGS) $(sort $(filter $(ninja-targets), $(ninja-cmd-goals))) 
| cat)
 endif
 endif
-- 
2.29.2