adaptation to rustbuild for openbsd

[semarie]

Since the switch to rustbuild, the build for openbsd is broken:

• ar inference based on compiler name is wrong (OpenBSD usually use egcc, but ear doesn't exist)
• make isn't GNU-make under OpenBSD (and others BSD platforms)
• stdc++ isn't the right stdc++ library to link with (it should be estdc++)
• corrects tests that don't pass anymore (problems related to rustbuild)

r? @alexcrichton

[semarie]

The make commit will close #38429.

The implementation statically bound "gmake" to BSD and let "make" to others. Eventually, I could add the use of a variable MAKE to override the behaviour ?

[semarie]

I think I will keep some tests failing with vanilla configuration: the fact that egcc compiler isn't used (but cc) for some tests, make them to fail: cc (GCC 4.2) is unable to link properly estdc++ library when the test needs it.

A simple workaround is to have a directory in front of PATH with a symbolic link cc to egcc.

[alexcrichton]

Looks good to me, thanks! When this is ready just lemme know and I'll r+

[semarie]

I have a failing test (check-std-all) that seems related to build_helper and cargo features. I am unsure if it is related to my commits or not.

executing step Step { name: "check-std-all", stage: 2, host: "x86_64-unknown-openbsd", target: "x86_64-unknown-openbsd" }
Testing libstd stage2 (x86_64-unknown-openbsd -> x86_64-unknown-openbsd)
running: "/data/semarie/obj/rust-installs/beta/bin/cargo" "test" "-j" "4" "--target" "x86_64-unknown-openbsd" "-v" "--release" "--frozen" "--manifest-path" "/data/semarie/src/rust/src/rustc/std_shim/Cargo.toml" "--features" "panic-unwind jemalloc backtrace" "-p" "std_shim" "-p" "std" "-p" "rand" "-p" "libc" "-p" "compiler_builtins" "-p"
"alloc" "-p" "collections" "-p" "unwind" "-p" "std_unicode" "-p" "panic_abort" "-p" "build_helper" "-p" "alloc_system" "-p" "core" "--"
error: Package `build_helper v0.1.0 (file:///data/semarie/src/rust/src/build_helper)` does not have these features: `backtrace, panic-unwind, jemalloc`
command did not execute successfully: "/data/semarie/obj/rust-installs/beta/bin/cargo" "test" "-j" "4" "--target" "x86_64-unknown-openbsd" "-v" "--release" "--frozen" "--manifest-path" "/data/semarie/src/rust/src/rustc/std_shim/Cargo.toml" "--features" "panic-unwind jemalloc backtrace" "-p" "std_shim" "-p" "std" "-p" "rand" "-p" "libc" "-p" "compiler_builtins" "-p" "alloc" "-p" "collections" "-p" "unwind" "-p" "std_unicode" "-p" "panic_abort" "-p"
"build_helper" "-p" "alloc_system" "-p" "core" "--"
expected success, got: exit code: 101

[semarie]

hum. it could be my cargo binary that is too old. It is a 0.13.0.

[semarie]

@alexcrichton it is ok now. My cargo was too old for correctly performing tests without errors.

As side note, I found it is more and more complex to build rustc now. I hope to not having to port a new platform (full cross-compiling isn't always possible) due to interdependance of rustc and cargo (and libc which needs cargo too to properly check it).

[alexcrichton]

@semarie I'm not sure I understand the sentiment that building is more complex now? The only difference is that building the compiler requires Cargo now as opposed to just a previous rustc. Otherwise the build system should take care of everything.

[alexcrichton]

@bors: r+

In any case, changes look good to me!

[bors]

📌 Commit 2c39ee1 has been approved by alexcrichton

[semarie]

If you already have "correct libc" + "rustc" + "cargo", there are no problem with the build system. But porting a new platform to Rust will require additionnal effort due to the interdependance of these three components.

[brson]

Nominated per https://internals.rust-lang.org/t/rust-1-15-release-status/4590/11