- envList = SConscript('src/SConscript', variant_dir = variant_path,
- exports = 'env')
-
- # Set up the regression tests for each build.
- for e in envList:
- SConscript('tests/SConscript',
- variant_dir = joinpath(variant_path, 'tests', e.Label),
- exports = { 'env' : e }, duplicate = False)
+ SConscript('src/SConscript', variant_dir = variant_path, exports = 'env')
+
+def pairwise(iterable):
+ "s -> (s0,s1), (s1,s2), (s2, s3), ..."
+ a, b = itertools.tee(iterable)
+ b.next()
+ return itertools.izip(a, b)
+
+# Create false dependencies so SCons will parse ISAs, establish
+# dependencies, and setup the build Environments serially. Either
+# SCons (likely) and/or our SConscripts (possibly) cannot cope with -j
+# greater than 1. It appears to be standard race condition stuff; it
+# doesn't always fail, but usually, and the behaviors are different.
+# Every time I tried to remove this, builds would fail in some
+# creative new way. So, don't do that. You'll want to, though, because
+# tests/SConscript takes a long time to make its Environments.
+for t1, t2 in pairwise(sorted(all_isa_deps.iterkeys())):
+ main.Depends('#%s-deps' % t2, '#%s-deps' % t1)
+ main.Depends('#%s-environs' % t2, '#%s-environs' % t1)