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-rw-r--r--libcxx/utils/libcxx/test/config.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/libcxx/utils/libcxx/test/config.py b/libcxx/utils/libcxx/test/config.py
index d85db0e197e..d21fc94030c 100644
--- a/libcxx/utils/libcxx/test/config.py
+++ b/libcxx/utils/libcxx/test/config.py
@@ -401,7 +401,8 @@ class Configuration(object):
if self.is_windows:
self.config.available_features.add('windows')
- # Attempt to detect the glibc version by querying
+ # Attempt to detect the glibc version by querying for __GLIBC__
+ # in 'features.h'.
macros = self.cxx.dumpMacros(flags=['-include', 'features.h'])
if macros is not None and '__GLIBC__' in macros:
maj_v, min_v = (macros['__GLIBC__'], macros['__GLIBC_MINOR__'])
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