Parallel builds in 3.1 branch?

Thu May 16 08:14:00 GMT 2002

Dave M. has asked me to consider applying my changes to support parallel
make to the GCC 3.1 branch so that we can speed up the build/test cycle.
I remember that there were some thoughts that my patch slowed things down
in serial. Has anyone measured this?
The only change that seems a likely culprit is that I ordered the .java
files slightly differently:
all_java_source_files = \
 $(java_source_files) \
 $(built_java_source_files) \
 $(x_java_source_files)
The old loop did:
libgcj-@gcc_version@.jar: $(built_java_source_files) $(java_source_files) 
$(x_java_source_files)
There are only two built_java_source_files, though, so it's hard for
me to believe this really made things slower.
If nobody else has measured, I will do so. Assuming that it really is
no slower than the old way, does anyone see a reason not to put this
on the GCC 3.1 branch?
--
Mark Mitchell mark@codesourcery.com
CodeSourcery, LLC http://www.codesourcery.com