Apply RUSTFLAGS arguments to rustc builds #2241

brson · 2015-12-22T18:09:41Z

Cargo will use RUSTFLAGS for building everything that is not a build script
or plugin. It does not apply to these targets because they may be for
a different platform that 'normal' builds.

Closes #2112

rust-highfive · 2015-12-22T18:09:52Z

r? @huonw

(rust_highfive has picked a reviewer for you, use r? to override)

brson · 2015-12-22T18:10:28Z

r? @alexcrichton

alexcrichton · 2015-12-23T18:12:20Z

Cargo may want to start tracking at a finer grain of why dependencies are being compiled the way they are. For example if a plugin has a dependency then the dependency will be compiled for the host architecture, but it'll have RUSTFLAGS applied to it even when the plugin doesn't. I would personally expect that the entire subgraphs of dependencies only used by plugins wouldn't get RUSTFLAGS treatment.

Also, could this have a few acceptance tests as well? e.g. fails-to-compile unless RUSTFLAGS is parsed properly.

brson · 2015-12-28T18:18:49Z

I'll try to figure out how to propagate the plugin-ness to dependencies.

re tests there is no error case in cargo's parsing of RUSTFLAGS. It only splits on space. Are there other tests you would like to see?

brson · 2015-12-28T20:36:07Z

I've got a patch that makes plugin deps not use RUSTFLAGS, but have discovered the build scripts have this same problem.

alexcrichton · 2016-01-11T18:01:26Z

It may actually be easier to just check kind to see whether the custom flags apply. Custom flags would apply to Kind::Target unconditionally and then it would also apply to Kind::Host if host == target.

That does mean that plugins and build scripts will get custom flags for a vanilla cargo build, but that's probably ok?

Zoxc · 2016-01-16T00:38:26Z

RUSTFLAGS should allow passing command line arguments which include spaces. I want to use this to pass --sysroot to rustc.

alexcrichton · 2016-01-27T18:30:54Z

One other test I thought of recently to add is to ensure that changing RUSTFLAGS will trigger recompliations.

brson · 2016-02-17T00:54:32Z

@alexcrichton I updated the patch to make the logic much simpler. What I've got is:

If --target is not specified, RUSTFLAGS applies to all builds.
If --target is specified, RUSTFLAGS only applies to builds
with the Kind::Target target kind, which indicates build units
derived from the requested --target.

This doesn't seem to capture your "it would also apply to Kind::Host if host == target" suggestion, but still all my test cases pass. Can you think of a test case that requires your suggested rule?

I'll look at the recompilation and parsing matters now.

alexcrichton · 2016-02-17T01:13:33Z

Looks good to me! The recompilation will probably come about by modifying this structure .

brson · 2016-02-17T01:48:08Z

@alexcrichton I've added a patch to recompile when RUSTFLAGS changes.

@Zoxc I'm not sure how to make RUSTFLAGS support spaces. I looked for precedent with CFLAGS and couldn't find it. Simple escaping with \ would make passing windows paths pretty terrible - everyone would need to know to escape RUSTFLAGS all the time.

alexcrichton · 2016-02-17T05:40:14Z

src/cargo/ops/cargo_rustc/fingerprint.rs

@@ -342,6 +351,7 @@ fn calculate<'a, 'cfg>(cx: &mut Context<'a, 'cfg>, unit: &Unit<'a>)
        deps: deps,
        local: local,
        memoized_hash: Mutex::new(None),
+        rustflags: env::var("RUSTFLAGS").ok(),


Could this use the methods on the context instead? That way if you use RUSTFLAGS with --target you won't recompile any build scripts or plugins (as they're not affected by this env var anyway)

alexcrichton · 2016-02-17T05:41:43Z

Could you also add a test for if RUSTFLAGS changes that a rebuild happens? Also if RUSTFLAGS doesn't change a rebuild doesn't spuriously happen

Zoxc · 2016-02-17T07:21:30Z

@brson Maybe Pascal style escaping with " is better? or use another escape charater than \

eddyb · 2016-02-17T08:27:33Z

I recommend shell-like quoting (e.g. bash "..." and '...'), with no $ or other such special cases.

If no semantics attached to \ are desired, then you can have both "..." and '...', with the former obeying the same simple rules as the latter.
You can then escape a'b by using "a'b" and x"y by using 'x"y', and it's still a proper subset of bash quote handling.

bors · 2016-02-29T19:51:56Z

☔ The latest upstream changes (presumably #2406) made this pull request unmergeable. Please resolve the merge conflicts.

brson · 2016-03-04T02:37:12Z

I've added another commit that also draws rustflags from the config file according to the following scheme:

build.rustflags is treated exactly like RUSTFLAGS.

target.rustflags only applies when --target is not specified.

target.$triple.rustflags only applies when `--target is
specified and the target matches.

RUSTFLAGS takes precedent, then build.rustflags, then target.

All are lists, so argument lists with spaces work. None of these allow extra flags to be passed to build scripts and plugins when --target is specified. We probably shouldn't land all these options.

Edit: it's important to note that because the config options are lists, there aren't corresponding CARGO_* env vars, only RUSTFLAGS.

alexcrichton · 2016-03-07T18:23:34Z

src/cargo/ops/cargo_rustc/context.rs

+
+        // First try RUSTFLAGS from the environment
+        if let Some(a) = env::var("RUSTFLAGS").ok() {
+            let args = a.split(" ").map(str::trim).map(str::to_string);


This may want a filter_map for "not empty" for environment variables like " -l foo --sysroot bar"

alexcrichton · 2016-03-07T18:27:44Z

Looks like some tests on travis are failing, but they probably just need a if !::is_nightly() { return } gate as they're using unstable features.

I'm curious what the difference between build.rustflags and target.rustflags are, they seem roughly equivalent right? Otherwise target.$triple.rustflags seems somewhat reasonable to me, but I'd also be fine starting out with just build.rustflags and RUSTFLAGS.

This passes RUSTFLAGS to rustc builds for the target architecture. We don't want to pass the RUSTFLAGS args to multiple architectures because they may contain architecture-specific flags. Ideally, the scheme we would use would treat plugins and build scripts - which may not be for the target architecture - consistently. Unfortunately it's quite difficult in the current Cargo architecture to seperately identify build scripts, plugins and their dependencies from code used by the target. So the scheme here is very simple: 1) If --target is not specified, RUSTFLAGS applies to all builds. 2) If --target is specified, RUSTFLAGS only applies to builds with the Kind::Target target kind, which indicates build units derived from the requested --target. Closes rust-lang#2112

brson · 2016-03-16T16:54:05Z

I'm curious what the difference between build.rustflags and target.rustflags are, they seem roughly equivalent right

They are almost the same. The difference is that build.rustflags applies regardless of whether --target is specified whereas target.rustflags only applies when --target is not specified.

brson · 2016-03-16T17:31:49Z

I've removed the target.* options and filtered out empty strings.

`build.rustflags` is treated exactly like `RUSTFLAGS`. It is a list, so argument lists with spaces work. `RUSTFLAGS` takes precedent, then `build.rustflags`.

brson · 2016-03-16T17:32:36Z

I did have to cargo update again today to get around a build error.

brson · 2016-03-16T17:33:01Z

This was the build error

/home/brian/.cargo/registry/src/github.com-88ac128001ac3a9a/libgit2-sys-0.4.0/lib.rs:539:9: 539:30 error: unresolved import `git_status_show_t::*`. Not a modu
le `git_status_show_t` [E0432]
/home/brian/.cargo/registry/src/github.com-88ac128001ac3a9a/libgit2-sys-0.4.0/lib.rs:539 pub use git_status_show_t::*;
                                                                                                 ^~~~~~~~~~~~~~~~~~~~~
/home/brian/.cargo/registry/src/github.com-88ac128001ac3a9a/libgit2-sys-0.4.0/lib.rs:539:9: 539:30 help: run `rustc --explain E0432` to see a detailed explana
tion

alexcrichton · 2016-03-16T20:58:07Z

@bors: r+ 2f01868

I am excite!

bors · 2016-03-16T20:58:11Z

⌛ Testing commit 2f01868 with merge 9208212...

alexcrichton · 2016-03-17T00:18:51Z

@bors: retry force clean

bors · 2016-03-17T00:18:53Z

⌛ Testing commit 2f01868 with merge 8c60ada...

Apply RUSTFLAGS arguments to rustc builds Cargo will use RUSTFLAGS for building everything that is not a build script or plugin. It does not apply to these targets because they may be for a different platform that 'normal' builds. Closes #2112

bors · 2016-03-17T00:41:51Z

☀️ Test successful - cargo-linux-32, cargo-linux-64, cargo-mac-32, cargo-mac-64, cargo-win-gnu-32, cargo-win-gnu-64, cargo-win-msvc-32, cargo-win-msvc-64

rust-highfive assigned huonw Dec 22, 2015

rust-highfive assigned alexcrichton and unassigned huonw Dec 22, 2015

Zoxc mentioned this pull request Jan 16, 2016

Passing target specific command line options to rustc #2284

Closed

brson mentioned this pull request Jan 22, 2016

Do not use SIMD instructions on i686 rust-lang/rust#31110

Closed

alexcrichton mentioned this pull request Jan 25, 2016

Add a --sysroot option to build and rustc commands #2312

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japaric mentioned this pull request Feb 1, 2016

Add support for Cargo zsup/firmware-rust#10

Open

alexcrichton mentioned this pull request Feb 2, 2016

Add -C link-dead-code option (to improve kcov code coverage) rust-lang/rust#31368

Merged

brson force-pushed the rustflags branch from 4b9c4a6 to 642ab17 Compare February 17, 2016 00:50

brson force-pushed the rustflags branch 2 times, most recently from 522db58 to 86acbc8 Compare February 17, 2016 01:41

brson added the relnotes Release-note worthy label Feb 17, 2016

brson force-pushed the rustflags branch from 86acbc8 to 1cc087d Compare February 17, 2016 01:46

alexcrichton reviewed Feb 17, 2016
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japaric mentioned this pull request Feb 17, 2016

use cargo-sysroot instead of rust-libcore japaric-archived/cu#2

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japaric mentioned this pull request Mar 4, 2016

[WIP] per profile sysroot via Cargo.toml #2436

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brson force-pushed the rustflags branch from 06bc455 to aa29143 Compare March 4, 2016 02:35

alexcrichton reviewed Mar 7, 2016
View reviewed changes

brson added 2 commits March 16, 2016 16:49

Recompile when RUSTFLAGS changes

e4baac0

brson force-pushed the rustflags branch from aa29143 to 2f01868 Compare March 16, 2016 17:31

Add rustflags support to config files

2f01868

`build.rustflags` is treated exactly like `RUSTFLAGS`. It is a list, so argument lists with spaces work. `RUSTFLAGS` takes precedent, then `build.rustflags`.

bors merged commit 2f01868 into rust-lang:master Mar 17, 2016

bors mentioned this pull request Mar 17, 2016

Fix running Cargo concurrently #2486

Merged

tari mentioned this pull request Apr 20, 2016

cargo rustdoc should build docs for dependencies #2594

Open

alexcrichton deleted the rustflags branch April 25, 2016 18:17

This was referenced Apr 25, 2016

Warn unused trait imports, rebased rust-lang/rust#33091

Merged

Parsing of RUSTFLAGS broken in cargo #2618

Closed

xitep mentioned this pull request May 26, 2016

rustc should attempt to use the gold linker by default, but this breaks Debian Wheezy because of obsolete gcc rust-lang/rust#30783

Closed

pnkfelix mentioned this pull request Jan 15, 2018

Bug optimization rust-lang/rust#47410

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Apply RUSTFLAGS arguments to rustc builds #2241

Apply RUSTFLAGS arguments to rustc builds #2241

brson commented Dec 22, 2015

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Apply RUSTFLAGS arguments to rustc builds #2241

Apply RUSTFLAGS arguments to rustc builds #2241

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