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* [musl] [Question] Statically compile and link C++ against musl on Ubuntu (musl-gcc)
@ 2021-12-24  7:37 Timo Lange
  2021-12-24  9:47 ` Markus Wichmann
  0 siblings, 1 reply; 2+ messages in thread
From: Timo Lange @ 2021-12-24  7:37 UTC (permalink / raw)
  To: musl

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Hey there.
I am currently compiling my C++ project against musl.
The reason is that I need a fully static executable and glibc does not seem to be suited for that case.

Currently I am doing the compilation inside an Alpine based Docker image. Using buildx and QEMU I also cross-compile for aarch64 - which is terribly slow.

Apart from that, the problem I am facing with this approach is that a few tools I want to use (static code analysis, FOSS scan, etc.) do not run under Alpine, as they require an Ubuntu loader.

Of course I tried making them run under Alpine but I feel this is not a proper solution. Anyhow I have failed so far.

So I came across musl-tools, resp. musl-gcc which is a wrapper around GCC on Ubuntu that "replaces" glibc libraries by musl. I am able to compile a simple C program with this, but not C++. It fails including any C++ header.
I assume it supports only C, as the name musl-gcc indicates.

Is there any way to compile a C++ program on Ubuntu entirely static (against musl)?
And if so, would this work with a "proper" amd64 -> aarch64 cross-compiler? So I could get rid of QEMU.

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^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [musl] [Question] Statically compile and link C++ against musl on Ubuntu (musl-gcc)
  2021-12-24  7:37 [musl] [Question] Statically compile and link C++ against musl on Ubuntu (musl-gcc) Timo Lange
@ 2021-12-24  9:47 ` Markus Wichmann
  0 siblings, 0 replies; 2+ messages in thread
From: Markus Wichmann @ 2021-12-24  9:47 UTC (permalink / raw)
  To: musl

On Fri, Dec 24, 2021 at 07:37:04AM +0000, Timo Lange wrote:
> Is there any way to compile a C++ program on Ubuntu entirely static (against musl)?

musl is a libc implementation. As such it contains all standard C
headers and all POSIX functions. In order to use the C++ standard
library with musl, however, you require an implementation of the C++
standard library. libcxx has, to my knowledge, been the most popular
choice to go along with musl, though GCC seems to like its libstdc++
more. I am sure a search engine will counsel you further in this matter

> And if so, would this work with a "proper" amd64 -> aarch64 cross-compiler? So I could get rid of QEMU.

musl can be cross-compiled with the standard options for
cross-compilation. You compile a cross-gcc (and its libgcc) for the
target you want, then compile musl with that cross-gcc, then compile g++
with musl, and then that somehow already contains a libstdc++, or else
you use libcxx. Again, I suggest a search engine.

Ciao,
Markus

^ permalink raw reply	[flat|nested] 2+ messages in thread

end of thread, other threads:[~2021-12-24  9:48 UTC | newest]

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2021-12-24  7:37 [musl] [Question] Statically compile and link C++ against musl on Ubuntu (musl-gcc) Timo Lange
2021-12-24  9:47 ` Markus Wichmann

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