Makefile: fix use of -j without an argument
Our Makefile massages the given make arguments to invoke ninja
accordingly. One key difference is that ninja will parallelize by
default, whereas make only does so with -j<n> or -j. The make man page
says that "if the -j option is given without an argument, make will not
limit the number of jobs that can run simultaneously". We use to support
that by replacing -j with "" (empty string) when calling ninja, so that
it would do its auto-parallelization based on the number of CPU cores.
This was accidentally broken at d1ce2cc95b (Makefile: preserve
--jobserver-auth argument when calling ninja, 2024-04-02),
causing `make -j` to fail:
$ make -j V=1
/usr/bin/ninja -v -j -d keepdepfile all | cat
make -C contrib/plugins/ V="1" TARGET_DIR="contrib/plugins/" all
ninja: fatal: invalid -j parameter
make: *** [Makefile:161: run-ninja] Error
Let's fix that and indent the touched code for better readability.
Signed-off-by: Matheus Tavares Bernardino <quic_mathbern@quicinc.com>
Fixes: d1ce2cc95b ("Makefile: preserve --jobserver-auth argument when calling ninja", 2024-04-02)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/Makefile b/Makefile
index 1837560..02a2575 100644
--- a/Makefile
+++ b/Makefile
@@ -141,8 +141,13 @@
MAKE.k = $(findstring k,$(firstword $(filter-out --%,$(MAKEFLAGS))))
MAKE.q = $(findstring q,$(firstword $(filter-out --%,$(MAKEFLAGS))))
MAKE.nq = $(if $(word 2, $(MAKE.n) $(MAKE.q)),nq)
-NINJAFLAGS = $(if $V,-v) $(if $(MAKE.n), -n) $(if $(MAKE.k), -k0) \
- $(or $(filter -l% -j%, $(MAKEFLAGS)), $(if $(filter --jobserver-auth=%, $(MAKEFLAGS)),, -j1)) \
+NINJAFLAGS = \
+ $(if $V,-v) \
+ $(if $(MAKE.n), -n) \
+ $(if $(MAKE.k), -k0) \
+ $(filter-out -j, \
+ $(or $(filter -l% -j%, $(MAKEFLAGS)), \
+ $(if $(filter --jobserver-auth=%, $(MAKEFLAGS)),, -j1))) \
-d keepdepfile
ninja-cmd-goals = $(or $(MAKECMDGOALS), all)
ninja-cmd-goals += $(foreach g, $(MAKECMDGOALS), $(.ninja-goals.$g))
