[1/2] ninja: Allow to limit the parallel build processes.
Commit Message
When run, ninja normally runs a maximum number of processes in parallel.
By default this is the number of cores on the system plus two. In some cases this can
overheat a CPU or run a system out of memory. If run from the command line, passing a
-jN parameter will limit the number of parallel processes, but some packages embed the
execution of ninja and do not pass a -j parameter.
Using this optional procedure allows us to limit the number of parallel processes
via an environment variable, NINJAJOBS.
Signed-off-by: Stefan Schantl <stefan.schantl@ipfire.org>
---
lfs/ninja | 8 ++++++++
1 file changed, 8 insertions(+)
@@ -71,6 +71,14 @@ $(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
@$(PREBUILD)
@rm -rf $(DIR_APP) && cd $(DIR_SRC) && tar zxf $(DIR_DL)/$(DL_FILE)
+ # Allow to limit the paralell build processes ninja will do.
+ cd $(DIR_APP) && sed -i '/int Guess/a \
+ int j = 0;\
+ char* jobs = getenv( "NINJAJOBS" );\
+ if ( jobs != NULL ) j = atoi( jobs );\
+ if ( j > 0 ) return j;\
+ ' src/ninja.cc
+
# Configure and bootstrap the build environment
cd $(DIR_APP) && python3 configure.py --bootstrap --verbose