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The build failure was noticed by Helmut Jarausch in https://bugs.gentoo.org/680232: $ ./configure CXXFLAGS='-std=c++17 -Os' ... CXXLD gdb ld: init.o: in function `initialize_all_files()': init.c:(.text+0x113): undefined reference to `_initialize_string_view_selftests()' It happens because '_initialize_string_view_selftests()' is conditionally defined based on C++ default. The change defines '_initialize_string_view_selftests()' unconditionally and leaves implementation a no-op on c++17 compilers. gdb/ChangeLog: 2019-03-17 Sergei Trofimovich <siarheit@google.com> * unittests/string_view-selftests.c: Define _initialize_string_view_selftests unconditionally.