Add OSSockOpt constants added by Linux 5.1 kernel

[slfritchie]

Add SO_RCVTIMEO_OLD, SO_RCVTIMEO_NEW, SO_SNDTIMEO_OLD, & SO_SNDTIMEO_NEW, which were added to the Linux kernel 5.1, see #3498.

Fixes #3498

Using this test program:

use "net"

actor Main
  new create(env: Env) =>
    @printf[I32]("so_rcvtimeo = %d\n".cstring(), OSSockOpt.so_rcvtimeo())
    @printf[I32]("so_rcvtimeo_old = %d\n".cstring(), OSSockOpt.so_rcvtimeo_old())
    @printf[I32]("so_rcvtimeo_new = %d\n".cstring(), OSSockOpt.so_rcvtimeo_new())
    @printf[I32]("so_sndtimeo = %d\n".cstring(), OSSockOpt.so_sndtimeo())
    @printf[I32]("so_sndtimeo_old = %d\n".cstring(), OSSockOpt.so_sndtimeo_old())
    @printf[I32]("so_sndtimeo_new = %d\n".cstring(), OSSockOpt.so_sndtimeo_new())

... I get the following output on an Ubuntu 19.10 x86-64 VM with a Linux 5.3.0-46-generic kernel.

so_rcvtimeo = 20
so_rcvtimeo_old = 20
so_rcvtimeo_new = 66
so_sndtimeo = 21
so_sndtimeo_old = 21
so_sndtimeo_new = 67

[SeanTAllen]

@slfritchie can you give the PR a more CHANGELOG friendly name?

[slfritchie]

Is the changelog bot back in use? (Sorry, I ought to know the answer but don't.)

Also, what's up with x86-64-unknown-linux-musl ?

[SeanTAllen]

@slfritchie known issue. i'm working on fixing it. clang is missing a dependency. we just switched to clang as our CI c compiler from gcc.

[SeanTAllen]

@slfritchie if you rebase against master, you'll be good.

[SeanTAllen]

@slfritchie is this a FIXED or an ADDED? Seems more like an ADDED.

[slfritchie]

@J0WI I think that this PR will take care of the problem that you'd reported in #3498. Please let us know if you have any problems with it.

[J0WI]

@J0WI I think that this PR will take care of the problem that you'd reported in #3498. Please let us know if you have any problems with it.

I'm still seeing the same error using ponyc 0.33.2 with this patch.

[SeanTAllen]

@J0WI can you try building master from source and let us know if you have an issue with it?

[J0WI]

The switch to cmake in master breaks my current setup. You should be able to reproduce when using an alpine:edge builder here (I tried to demonstrate this in #3518):

ponyc/.ci-dockerfiles/x86-64-unknown-linux-musl-builder/Dockerfile

Line 1 in 1da8604

FROM alpine:3.11

edge uses Linux 5.4 while 3.11 uses Linux 4.19.

Make sure to use LLVM 9, I had other issues with version 10.

You can find the current workaround here.