[swift-build-dev] SwiftPM platform-specific build folders

[David Hart]

Response inline:

> On 22 Jun 2017, at 21:00, Ricardo N Olivieri <ricardo.olivieri at us.ibm.com> wrote:
> 
> Thanks Daniel for the heads up.
> 
> I like the goals that SR-3583 and SR-5259 are targeting. For instance, because the solution described in SR-3583 is not yet available, we have been using the "--build-path" argument when building inside Docker containers or VMs as a way to avoid overriding the .build folder on the macOS host:
> 
> swift build --configuration debug --build-path .build-ubuntu-1404
> 
> If SR-3583 gets implemented, then SR-5259 would be certainly beneficial for our buildpack. As you pointed out, with SR-5259, the buildpack would be able to determine the build path at runtime without having to hard code it. In our buildpack we could execute "swift build --bin-path", which I assume would output something along these lines: “.build/macosx-x86_64”, “.build/ubuntu-1404”, etc... correct?

Actually, I think it should contain the full path, including the configuration folder:

.build/macosx-x86_64/debug

> Question... would "swift build --display-build-path" be a better option than "swift build --bin-path" to display the path to the build folder? I am thinking this would align better with the current 
> "--build-path" option that exists now:

The path mentioned by those options are different.

--build-path allows setting the root build folder, and the build process will then create the necessary platform/configuration folder structure inside there.

On the other hand, the option we plan to introduce will output the full path the binaries will be built into for a run with the same options, including the platform and configuration folders, hence the bin in the name.

But we are open to other name suggestions.

> $ swift build --help
> OVERVIEW: Build sources into binary products
> 
> USAGE: swift build [options]
> 
> OPTIONS:
>   --build-path            Specify build/cache directory [default: ./.build]
>   --chdir, -C             Change working directory before any other operation
>   --color                 Specify color mode (auto|always|never) [default: auto]
>   --configuration, -c     Build with configuration (debug|release) [default: debug]
>   --enable-prefetching    Enable prefetching in resolver
>   --verbose, -v           Increase verbosity of informational output
>   -Xcc                    Pass flag through to all C compiler invocations
>   -Xlinker                Pass flag through to all linker invocations
>   -Xswiftc                Pass flag through to all Swift compiler invocations
>   --help                  Display available options
> 
> 
> 
> Regards,
>   Ricardo Olivieri
>   Software Engineer
>   IBM Swift Engineering at IBM Cloud
> 
> 
> From:        Daniel Dunbar <daniel_dunbar at apple.com>
> To:        David Hart <david at hartbit.com>, Kyle Fuller <kyle at fuller.li>, Gregor Milos <gmilos at apple.com>, Ricardo N Olivieri <ricardo.olivieri at us.ibm.com>
> Cc:        "swift-build-dev at swift.org" <swift-build-dev at swift.org>
> Date:        06/19/2017 05:49 PM
> Subject:        Re: [swift-build-dev] SwiftPM platform-specific build folders
> Sent by:        daniel_dunbar at apple.com
> 
> 
> 
> (CC'ing a couple people I know have worked on build packs in the past.)
> 
> Thanks David!
> 
> For those only on the mailing list, we discussed this plan on the SwiftPM Slack channel, and I think making this change in the Swift 4 timeframe is right, even though it may break some things.
> 
> One of the main goals of the compatibility work is to make sure that we don't break any of the existing deployment workflows people have built on top of SwiftPM (for example PaaS buildpacks). We don't have time for a full "make install" type workflow which buildpacks could use, but my hope was that SR-5259 would be something existing build packs could migrate to to avoid having to hard code certain paths.
> 
> We'd love feedback on whether this seems like a reasonable plan.
> 
>  - Daniel
> 
> On Jun 19, 2017, at 3:19 PM, David Hart via swift-build-dev <swift-build-dev at swift.org> wrote:
> 
> Hello mailing-list,
> 
> I’m implementing SR-3583that builds SwiftPM products into platform-specific sub-folders. For example, on macOS, a default build will no longer build products into .build/debugbut instead in .build/macosx-x86_64/debug.
> 
> To alleviate this breaking change, several solutions have been planned:
> SE-0179: A new swift run tool to allow users to run executable products without knowing their exact location.
> SR-3583 will create a symlink after each build pointing from the old to the new build folder for backwards compatibility.
> SR-5259: A new —bin-path option for the swift build command to print the build folder for 3rd party tools to use.
> 
> Of the above, only SE-0179 is currently fully implemented in master.
> 
> What does everybody think about this change and the solutions put into place to support it?
> 
> Regards,
> David.
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> 
> 
> 
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