Fix the case where the number of jobs is less than the

number of threads.  In that case make the number of threads
equal to the number of jobs and launch one jobs on each
thread.  This makes things work like make -j.

llvm-svn: 127045

utils/llvmbuild

@@ -650,7 +650,8 @@ class Builder(threading.Thread):
 
 
     def configure(self, component, srcdir, builddir, flags, env):
-        self.logger.debug("Configure " + str(flags))
+        self.logger.debug("Configure " + str(flags) + " " + str(srcdir) + " -> "
+                          + str(builddir))
 
         configure_files = dict(
             llvm=[(srcdir + "/configure", builddir + "/Makefile")],
@@ -721,8 +722,16 @@ branch_abbrev = get_path_abbrevs(set(options.branch))
 
 work_queue = queue.Queue()
 
-for t in range(options.threads):
-    jobs = options.jobs // options.threads
+jobs = options.jobs // options.threads
+if jobs == 0:
+    jobs = 1
+
+numthreads = options.threads
+if jobs < numthreads:
+    numthreads = jobs
+    jobs = 1
+
+for t in range(numthreads):
     builder = Builder(work_queue, jobs,
                       build_abbrev, source_abbrev, branch_abbrev,
                       options)