On 08.09.2023 20:55, Kacper Michajlow wrote:
On Fri, 8 Sept 2023 at 01:35, Timo Rothenpieler via ffmpeg-devel
<ffmpeg-devel@ffmpeg.org> wrote:
On 07.09.2023 23:38, Kacper Michajlow wrote:
On Thu, 7 Sept 2023 at 15:12, Derek Buitenhuis
<derek.buitenh...@gmail.com> wrote:
On 9/6/2023 6:31 PM, Kacper Michajlow wrote:
What would be a downside of preferring CXX always if it exists?
FFmpeg runs in a multitude of environments with a multitude of portability
requirements. Needlessly linking a C++ runtime is not OK.
This does not answer my question. Let me rephrase. Do we know the case
where using C++ compiler driver rather than C would degrade the
quality of the resulting build?
Using C++ driver would indeed append the (correct) runtime library to
the linker command, but if nothing references any symbols from it it
would not be linked. It is also why the current way of forcing
`lstdc++` kinda works, because it is silently ignored when not needed.
Implementing logic to use C++ only when necessary is possible, but I'm
not a big fan of such automation. And in practice not sure how well it
would work, because it would require trying to link twice every
dependency in configure.
Also the fact that "FFmpeg runs in a multitude of environment" is
precisely why I really don't like the current unconditional including
`-lstdc++`.
Couldn't you just check if stdc++ is in the ldflags/extralibs, and if
so, remove it, and use g++ to link?
Well, I'm lost now. Are you suggesting building on top of existing
hacks is a better solution than the proposed patch?
The proposed patch looks like a near unmaintainable hack to me as it is.
Anything that's less brittle is highly preferred.
There is no good solution here, but I'm very much against any solution
that has high potential for random breakages and hard to predict
side-effects.
I refuse supporting any kind of random `-lstdc++` adding in configure
and then removing it in the end.
- Kacper
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