Bug 646132 – dev-lang/rust-1.23.0-r1 has automagic dependency on net-libs/http-parser and net-libs/libssh2

• Product: Gentoo Linux
• Status: RESOLVED FIXED

[Description Martin Väth 2018-01-30 17:23:11 UTC]

Since some of the previous gentoo repository updates, nothing depends anymore on net-libs/http-parser and net-libs/libssh2 on my system.

However, these packages are not properly unmerged with FEATURES=preserved-libs, because the rust and cargo binaries installed by dev-lang/rust-1.23.0-r1[extended] link to the libraries installed by these packages.

So either the dependency is missing by mistake, or it is a mistake that the rust and cargo binaries are linked to these libraries.

[Comment 1 Georgy Yakovlev 2018-02-01 04:51:14 UTC]

Can confirm.
Just run a depclean and here the breakage list for my system.

!!! existing preserved libs:
>>> package: net-libs/http-parser-2.6.2
 *  - /usr/lib64/libhttp_parser.so.2.6.2
 *      used by /usr/bin/cargo (dev-lang/rust-1.23.0-r1)
 *      used by /usr/bin/cargo-ebuild (app-portage/cargo-ebuild-0.1.4)
 *      used by /usr/bin/exa (sys-apps/exa-0.8.0)
 *      used by /usr/bin/rls (dev-lang/rust-1.23.0-r1)
>>> package: net-libs/libssh2-1.7.0
 *  - /usr/lib64/libssh2.so.1
 *  - /usr/lib64/libssh2.so.1.0.1
 *      used by /usr/bin/cargo (dev-lang/rust-1.23.0-r1)
 *      used by /usr/bin/cargo-ebuild (app-portage/cargo-ebuild-0.1.4)
 *      used by /usr/bin/rls (dev-lang/rust-1.23.0-r1)

[Comment 2 Georgy Yakovlev 2018-02-01 05:44:19 UTC]

After rebuilding rust and broken packages everything is fine. so it looks like it  links to the libraries.

[Comment 3 Martin Väth 2018-02-01 14:48:12 UTC]

Finally, I managed to recompile rust.

(For some strange reason, compilation always had failed with some path issues - it was not bug 646092, because I had tried with MAKEOPTS="" - but now after some emerge --sync it suddenly works again...)

Now I finally can confirm that it is indeed an automagic dependency:
If rust is compiled with libssh2 (or http-parser) being installed, it will link against the corresponding libraries, otherwise it will not link against them.

(And it is indeed the binaries mentioned by Georgy which link against the libraries, not the rustc binary as one might misunderstand from my first posting).

[Comment 4 Martin Väth 2018-04-08 16:25:40 UTC]

The libssh2 dependency appears to be really optional:

src/tools/cargo/src/doc/book/src/reference/build-scripts.md:

* It has an optional dependency on libssh2 on all platforms to implement the ssh
  transport.


In contrast, the http-dependency appears not to be optional:

src/vendor/libgit2-sys/libgit2/CMakeLists.txt:

"http-parser version 2 was not found; using bundled 3rd-party sources."

So to avoid bundling, it seems that http-parser dependency should be added.

[Comment 5 tt_1 2018-04-15 13:39:53 UTC]

Today there was an update of net-libs/http-parser, portage doesn't force to rebuild either cargo or rust-bin on my system. Which is why I skipped the update for the moment - but will it break silently both cargo and the rust-bin package? I can handle cargo, bot it could be difficult to rebuild the rust-bin package?

[Comment 6 Dirkjan Ochtman (RETIRED) 2018-08-11 11:40:49 UTC]

This has been fixed in recent versions.

[Comment 7 orbea 2023-05-03 18:26:06 UTC]

It seems as of dev-lang/rust-1.69.0-r1 it still doesn't use the system version of libssh2 which can be enabled by exporting 'LIBSSH2_SYS_USE_PKG_CONFIG=1'.