[Bug libstdc++/60936] [5/6/7 Regression] Binary code bloat with std::string

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60936

--- Comment #25 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I have, and it doesn't make much difference:

    175800      gcc48.so
    608280      gcc49.so
   1159624      gcc5-cow.so
   1176296      gcc6-cow-gc.so
   1176296      gcc6-cow.so
   1180400      gcc6-gc.so
   1180400      gcc6.so
    258376      gcc7-cow-patched.so
   1188568      gcc7-cow-trunk.so
    258384      gcc7-patched.so
   1188552      gcc7-trunk.so

-cow means using -D_GLIBCXX_CXX11_ABI=0

-gc means using -Wl,--gc-sections

-patched means I've split the explicit instantiations into separate files and
changed __snprintf_lite to not use __int_to_char from locale-inst.o

The patch makes a big difference.