Compiler search uses a pool of workers (#10190)

- spack.compilers.find_compilers now uses a multiprocess.pool.ThreadPool to execute
  system commands for the detection of compiler versions.

- A few memoized functions have been introduced to avoid poking the filesystem multiple
  times for the same results.

- Performance is much improved, and Spack no longer fork-bombs the system when doing a `compiler find`

1 files changed, 5 insertions, 1 deletions

diff --git a/lib/spack/llnl/util/tty/color.py b/lib/spack/llnl/util/tty/color.py
index fd982b54af..6789ecbdb3 100644
--- a/lib/spack/llnl/util/tty/color.py
+++ b/lib/spack/llnl/util/tty/color.py
@@ -59,10 +59,14 @@ The console can be reset later to plain text with '@.'.
 
 To output an @, use '@@'.  To output a } inside braces, use '}}'.
 """
+from __future__ import unicode_literals
 import re
 import sys
+
 from contextlib import contextmanager
 
+import six
+
 
 class ColorParseError(Exception):
     """Raised when a color format fails to parse."""
@@ -244,7 +248,7 @@ def cescape(string):
     Returns:
         (str): the string with color codes escaped
     """
-    string = str(string)
+    string = six.text_type(string)
     string = string.replace('@', '@@')
     string = string.replace('}', '}}')
     return string