Add armv7lhf detection

1 files changed, 22 insertions, 1 deletions

diff --git a/morphlib/util.py b/morphlib/util.py
index 68aed608..024de495 100644
--- a/morphlib/util.py
+++ b/morphlib/util.py
@@ -1,4 +1,4 @@
-# Copyright (C) 2011-2013  Codethink Limited
+# Copyright (C) 2011-2014  Codethink Limited
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -16,6 +16,7 @@
 import itertools
 import os
 import re
+import subprocess
 
 import fs.osfs
 
@@ -399,6 +400,23 @@ def parse_environment_pairs(env, pairs):
     return dict(env.items() + extra_env.items())
 
 
+def has_hardware_fp(): # pragma: no cover
+    '''
+    This function returns whether the binary /proc/self/exe is compiled
+    with hardfp _not_ whether the platform is hardfp.
+
+    We expect the binaries on our build platform to be compiled with
+    hardfp.
+
+    This is not ideal but at the time of writing this is the only
+    reliable way to decide whether our architecture is a hardfp
+    architecture.
+    '''
+
+    output = subprocess.check_output(['readelf', '-A', '/proc/self/exe'])
+    return 'Tag_ABI_VFP_args: VFP registers' in output
+
+
 def get_host_architecture(): # pragma: no cover
     '''Get the canonical Morph name for the host's architecture.'''
 
@@ -418,6 +436,9 @@ def get_host_architecture(): # pragma: no cover
     if machine not in table:
         raise morphlib.Error('Unknown host architecture %s' % machine)
 
+    if machine == 'armv7l' and has_hardware_fp():
+        return 'armv7lhf'
+
     return table[machine]