[Bug libstdc++/90361] [9/10 Regression] Undefined symbols in libstdc++ when building with --with-default-libstdcxx-abi=gcc4-compatible

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90361

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Mon Aug 12 16:41:27 2019
New Revision: 274314

URL: https://gcc.gnu.org/viewcvs?rev=274314&root=gcc&view=rev
Log:
PR libstdc++/90361 add missing macro definition

The src/c++17/string-inst.cc file needs to override the default string
ABI so that it still contains the expected symbols even when the library
is configured with --with-default-libstdcxx-abi=gcc4-compatible.

        PR libstdc++/90361
        * src/c++17/string-inst.cc: Use _GLIBCXX_USE_CXX11_ABI=1 by default.

Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/src/c++17/string-inst.cc