Linking to libstdc++

[Isuru Fernando]

Hi,

Anybody know why sage is linking to libstdc++?

https://github.com/sagemath/sage/blob/cdb4c0b073efce77b08de4aa24df6583cdb74fa3/src/setup.py#L371-L374

In OSX, we don't need libstdc++, because we are using libc++. Git history says it was added 13 years ago by William Stein.

Isuru

[François Bissey]

That far back? It was probably something like ntl or singular (or something that has since then
been removed) that didn’t link properly.
More seriously, it may have been because the linker used was gcc instead of g++ even when linking
C++ code. We know there is/was that issue about C/C++ compiler in distutils (I haven’t been keeping
track, are we still patching python for that in distros?).

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[Isuru Fernando]

Yes, it was probably NTL related. https://github.com/sagemath/sage/commit/bc333c78b0369377657452e340cb6b3f27c5cee0

I think distutils now knows to link with the C++ compiler even though it compiles C++ sources with a C compiler. OSX build works fine without `libc++` being linked in explicitly, so that must mean that we are using clang++ on OSX at the correct place, right?

Isuru

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[François Bissey]

> On 14/06/2020, at 4:25 PM, Isuru Fernando <isu...@gmail.com> wrote:
>
> Yes, it was probably NTL related. https://github.com/sagemath/sage/commit/bc333c78b0369377657452e340cb6b3f27c5cee0
>

Nice digging. libcsage is no more and it’s been a while.

> I think distutils now knows to link with the C++ compiler even though it compiles C++ sources with a C compiler. OSX build works fine without `libc++` being linked in explicitly, so that must mean that we are using clang++ on OSX at the correct place, right?
>

I would think so.

François

[Dima Pasechnik]

Probably can be just removed.

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[François Bissey]

+1 - it should at least be tried.

[Dima Pasechnik]

please see https://trac.sagemath.org/ticket/29856 for a try to remove it

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