[petsc-dev] need c++ expert help

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:

> On Sun, Dec 31, 2017 at 1:55 PM, Jed Brown <jed at jedbrown.org> wrote:
>
>> These look like linker errors and that build uses
>> --with-cxxlib-autodetect=0.  We either need a rule to *link* C++ using
>> CXX (i.e., mpicxx) or add LIBS=-lstdc++.
>>
>
> I thought we were doing this (linking C++ mains with CXX).

After compiling to the object file (ex3.o) we don't know what language
main was written in, and this doesn't solve the actual problem that C++
linking is required if any object (not just main) depends on C++.