[PATCH] Fix gnu-versioned-namespace build

[François Dumont]

The gnu-versioned-namespace build is broken.

The fix in charconv/floating_from_chars.cc is quite trivial. I am not so 
sure about the fix in sstream-inst.cc.

     libstdc++: Fix gnu-version-namespace buid

     libstdc++-v3/ChangeLog

             * include/std/charconv (from_chars): Define only if
             _GLIBCXX_USE_CXX11_ABI.
             * src/c++17/floating_from_chars.cc (from_chars): Likewise.
             * src/c++20/sstream-inst.cc: Limit instantiations if
             _GLIBCXX_USE_CXX11_ABI.

I build the lib with this patch. I am now running tests.

Ok to commit if tests are successful ?

François

-------------- next part --------------
A non-text attachment was scrubbed...
Name: version-ns.patch
Type: text/x-patch
Size: 1632 bytes
Desc: not available
URL: <https://gcc.gnu.org/pipermail/gcc-patches/attachments/20201030/0fef9c68/attachment.bin>