[PULL 3/7] build: rebuild build.ninja using "meson setup --reconfigure"

[Paolo Bonzini <pbonzini@redhat.com>]

Do not use the rule in build.ninja, because the path to meson is hardcoded
in build.ninja and this breaks if meson moves (for example if the distro
meson suddenly becomes too old after an update).

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Tested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 Makefile | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index 3c7d67142f13..08fb6a3b058a 100644
--- a/Makefile
+++ b/Makefile
@@ -115,15 +115,15 @@ Makefile.ninja: build.ninja
 	  $(NINJA) -t query build.ninja | sed -n '1,/^  input:/d; /^  outputs:/q; s/$$/ \\/p'; \
 	} > $@.tmp && mv $@.tmp $@
 -include Makefile.ninja
+endif
 
+ifneq ($(MESON),)
 # A separate rule is needed for Makefile dependencies to avoid -n
 build.ninja: build.ninja.stamp
 $(build-files):
 build.ninja.stamp: meson.stamp $(build-files)
-	$(NINJA) $(if $V,-v,) build.ninja && touch $@
-endif
+	$(MESON) setup --reconfigure $(SRC_PATH) && touch $@
 
-ifneq ($(MESON),)
 Makefile.mtest: build.ninja scripts/mtest2make.py
 	$(MESON) introspect --targets --tests --benchmarks | $(PYTHON) scripts/mtest2make.py > $@
 -include Makefile.mtest
-- 
2.40.1