Remove building llvm2ice.build_atts from Subzero build.

pydir/if.py

+#!/usr/bin/env python2
+
+import argparse
+import os
+import sys
+
+from utils import shellcmd
+
+def main():
+  """Run the specified command only if conditions are met.
+
+     Two conditions are checked. First, the CONDITION must be true.
+     Secondly, all NEED names must be in the set of HAVE names.
+     If both conditionas are met, the command defined by the remaining
+     arguments is run in a shell.
+  """
+  argparser = argparse.ArgumentParser(
+    description='    ' + main.__doc__,
+    formatter_class=argparse.ArgumentDefaultsHelpFormatter)
+  argparser.add_argument('--cond', choices={'true', 'false'} , required=False,

[Jim Stichnoth, 2014/10/29 21:29:37]

A little bikeshedding.  What about:

argparser.add_argument('--cond-true',  dest='cond', action='store_true')
argparser.add_argument('--cond-false', dest='cond', action='store_false')

(And I was going to ask how the test below on args.cond could possibly work, but
I see you fixed it... :)

[Karl, 2014/10/29 21:55:27]

We can't use the same desc field for two different arguments. argparse does not
allow this. Leaving as is.

+                         default='true', metavar='CONDITION',
+                         help='Condition to test.')
+  argparser.add_argument('--need', required=False, default=[],
+                         action='append', metavar='NEED',
+                         help='Needed name. May be repeated.')
+  argparser.add_argument('--have', required=False, default=[],
+                         action='append', metavar='HAVE',
+                         help='Name you have. May be repeated.')
+  argparser.add_argument('--echo-cmd', required=False,
+                         action='store_true',
+                         help='Trace the command before running.')
+  argparser.add_argument('--command', nargs=argparse.REMAINDER,
+                         help='Command to run if attributes found.')
+
+  args = argparser.parse_args()
+
+  # Quit early if no command to run.
+  if not args.command:
+    raise RuntimeError("No command argument(s) specified for ifatts")
+
+  if args.cond and set(args.need) <= set(args.have):
+    stdout_result = shellcmd(args.command, echo=args.echo_cmd)
+    if not args.echo_cmd:
+      sys.stdout.write(stdout_result)
+
+if __name__ == '__main__':
+  main()
+  sys.exit(0)