The functionality added by https://reviews.llvm.org/D145803 is gated by
lldb tuning, so we need to build the test programs with `-glldb` to make
these tests print the expected preferred name.
Differential Revision: https://reviews.llvm.org/D148582
USE_LIBCPP := 1
-CXXFLAGS_EXTRAS := -std=c++14
+# We need debug info tuning for lldb in order to emit the preferred name for
+# std::string. See https://reviews.llvm.org/D145803.
+CXXFLAGS_EXTRAS := -std=c++14 -glldb
include Makefile.rules
USE_LIBCPP := 1
-CXXFLAGS_EXTRAS := -std=c++14
+# We need debug info tuning for lldb in order to emit the preferred name for
+# std::string. See https://reviews.llvm.org/D145803.
+CXXFLAGS_EXTRAS := -std=c++14 -glldb
include Makefile.rules