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Allow deps to be renamed #285

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merged 2 commits into from
Jan 29, 2020
Merged

Allow deps to be renamed #285

merged 2 commits into from
Jan 29, 2020

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GregBowyer
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@GregBowyer GregBowyer mentioned this pull request Dec 20, 2019
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damienmg
damienmg reviewed Dec 20, 2019
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Hi, Thanks for sending out this PR.

What is the goal of the alias?

It seems to me one of the goal would be to avoid crate name collision but this PR does not address this case.

Also could you had an aliasing test case in the examples?

rust/private/rust.bzl Outdated
@@ -275,6 +279,13 @@ _rust_common_attrs = {
linking a native library.
"""),
),
"aliases": attr.label_keyed_string_dict(
doc = _tidy("""
Remap crates to a new name or monikor for linkage to this target
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monikor is a typo?, of monitor?

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typo, should be moniker

rust/private/rust.bzl Outdated
doc = _tidy("""
Remap crates to a new name or monikor for linkage to this target

These are other `rust_library` targets and will be presented as the new name given
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Unfinished sentence.

@GregBowyer
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Hi, Thanks for sending out this PR.

What is the goal of the alias?

It seems to me one of the goal would be to avoid crate name collision but this PR does not address this case.

Also could you had an aliasing test case in the examples?

Sorry I dashed this out a little quickly yesterday to pack up just before the holidays.

This is to allow for crate style renames, this is something that occurs very occasionally in crates, the basic idea is to present to a library an external crate under a different name.

The big one where this showed up was in compiling futures at version 0.3.x, with the feature compat. This leads to a situation where futures-util-0.3.x (a dependency of futures as a bill of materials) claims a dep in Cargo.toml like so.

[dependencies.futures_01]
version = "0.1.25"
optional = true
package = "futures"

That is, it depends on an earlier version of futures and includes it, from its viewpoint, as the crate futures_01

This rename is achieved through changing the name on the --extern parameter passed to the compiler.

This is related to google/cargo-raze#123

Without this, its pretty hard to compile crates that perform renames without patching

damienmg
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Just need to address the two comments on comments.

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Addressed the comments and added some basic tests

@kornholi kornholi mentioned this pull request Jan 8, 2020
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damienmg
damienmg approved these changes Jan 9, 2020
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There are failure on the CI, could you address them?

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Looks like the build error was an unrelated stardoc incompatibility change, I will push that as a seperate PR that this is based on

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GregBowyer commented Jan 10, 2020 •
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This currently is blocked / deps on #290

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Rebasing fun, do we want to merge this to unlock cargo-raze?

@damienmg damienmg merged commit a1bfa0d into bazelbuild:master Jan 29, 2020
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Thanks for this PR!

@GregBowyer GregBowyer deleted the alias-deps branch January 30, 2020 01:17
@ipetr0v ipetr0v mentioned this pull request Apr 22, 2020
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@damienmg damienmg damienmg approved these changes

@acmcarther acmcarther Awaiting requested review from acmcarther

@mfarrugi mfarrugi Awaiting requested review from mfarrugi

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