[libcxx] Use newest supported language dialect when running the test suite.
Summary:
Currently the test suite defaults to C++11 mode if no standard version is supplied to LIT using `--param=std=c++XX`. This patch changes that behavior so that the newest possible dialect is selected instead.
I have already patched the C++11 bot to explicitly specify `--param=std=c++11`. I'm just putting this up for review to see if anybody objects to this idea.
Reviewers: mclow.lists, jroelofs, danalbert
Subscribers: cfe-commits
Differential Revision: http://reviews.llvm.org/D13331
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@249226 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/libcxx/test/config.py b/test/libcxx/test/config.py
index f8f336d..11e7cbe 100644
--- a/test/libcxx/test/config.py
+++ b/test/libcxx/test/config.py
@@ -344,7 +344,20 @@
# Try and get the std version from the command line. Fall back to
# default given in lit.site.cfg is not present. If default is not
# present then force c++11.
- std = self.get_lit_conf('std', 'c++11')
+ std = self.get_lit_conf('std')
+ if not std:
+ # Choose the newest possible language dialect if none is given.
+ possible_stds = ['c++1z', 'c++14', 'c++11', 'c++03']
+ for s in possible_stds:
+ if self.cxx.hasCompileFlag('-std=%s' % s):
+ std = s
+ self.lit_config.note(
+ 'inferred language dialect as: %s' % std)
+ break
+ if not std:
+ self.lit_config.fatal(
+ 'Failed to infer a supported language dialect from one of %r'
+ % possible_stds)
self.cxx.compile_flags += ['-std={0}'.format(std)]
self.config.available_features.add(std)
# Configure include paths
