r241568 - Add a comment to explain how the decision to pass feature "+long-calls" is made.

[Akira Hatanaka]

Author: ahatanak
Date: Tue Jul  7 03:28:42 2015
New Revision: 241568

URL: http://llvm.org/viewvc/llvm-project?rev=241568&view=rev
Log:
Add a comment to explain how the decision to pass feature "+long-calls" is made.

Modified:
    cfe/trunk/lib/Driver/Tools.cpp

Modified: cfe/trunk/lib/Driver/Tools.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/Tools.cpp?rev=241568&r1=241567&r2=241568&view=diff
==============================================================================
--- cfe/trunk/lib/Driver/Tools.cpp (original)
+++ cfe/trunk/lib/Driver/Tools.cpp Tue Jul  7 03:28:42 2015
@@ -708,6 +708,9 @@ static void getARMTargetFeatures(const D
     Features.insert(Features.begin(), "+v8.1a");
   }
 
+  // Look for the last occurrence of -mlong-calls or -mno-long-calls. If
+  // neither options are specified, see if we are compiling for kernel/kext and
+  // decide whether to pass "+long-calls" based on the OS and its version.
   if (Arg *A = Args.getLastArg(options::OPT_mlong_calls,
                                options::OPT_mno_long_calls)) {
     if (A->getOption().matches(options::OPT_mlong_calls))