Can't invoke swift build

[eimantas]

I have latest release of swift 2.2 (march 1st as of this writing). When running make on ubuntu 14.04 in the root of kitura, i get an error:

swift build
error: unable to invoke subcommand: /home/eimantas/src/swift-2.2/usr/bin/swift-build (No such file or directory)
make: [make] Error 2 (ignored)

Any help is appreciated.

[shmuelk]

@eimantas Please install an appropriate Swift 3.0 driver. 02/08 for the master branch of Kitura or 02/25 for the develop branch.

[eimantas]

I'm using 02/25 image of Swift on Linux Ubntu 14.04 and attempting to build using the given command in README.md, but this is the new error that I get:

error: The dependency graph could not be satisfied because an update to `https://github.com/IBM-Swift/Kitura-router.git' is required

[eimantas]

Okay, so I managed to push a bit further. I removed everything from Packages/ subdirectory and reran the build command:

swift build -Xcc -fblocks

After recloning all dependencies and starting building the project it got stuck on building KituraSys dependency:

swift build
Compiling Swift Module 'LoggerAPI' (1 sources)
Compiling Swift Module 'SwiftyJSON' (2 sources)
Compiling Swift Module 'BlueSocket' (3 sources)
Compiling Swift Module 'KituraSys' (4 sources)
/home/eimantas/src/swilnius/Packages/Kitura-Sys-0.3.1/Sources/KituraSys/SysUtils.swift:17:8: error: no such module 'Dispatch'
import Dispatch
       ^
/home/eimantas/src/swilnius/Packages/Kitura-Sys-0.3.1/Sources/KituraSys/SysUtils.swift:17:8: error: no such module 'Dispatch'
import Dispatch
       ^
/home/eimantas/src/swilnius/Packages/Kitura-Sys-0.3.1/Sources/KituraSys/SysUtils.swift:17:8: error: no such module 'Dispatch'
import Dispatch
       ^
/home/eimantas/src/swilnius/Packages/Kitura-Sys-0.3.1/Sources/KituraSys/SysUtils.swift:17:8: error: no such module 'Dispatch'
import Dispatch
       ^
<unknown>:0: error: build had 1 command failures

I have applied the swift dispatch library patch before going further, but it seems that there's still something lacking here.

[vadimeisenbergibm]

The error probably means that you do not have dispatch directory in /usr/local/include/ . Please make sure that you run sudo make install in swift-corelibs-libdispatch and that dispatch directory is created in /usr/local/include/.

[eimantas]

I see. Is there a way to pass the linker a flag where it can find the Dispatch library? Since the library was configured with certain prefix which defines non-standard swift location.

[vadimeisenbergibm]

Yes - you can add flags to swift build command to pass compiler/linker options, e.g -Xswiftc -I/usr/local/include -Xlinker -L/usr/local/lib.

[eimantas]

so this is weird. I have verified that libdispatch is present in /usr/local/lib and ran the commands. Got the following output:

$ cd /usr/local/lib                                                                                                                                             ⏎
$ ls -l libdispatch*
-rwxr-xr-x 1 root root   1026 Mar  3 14:01 libdispatch.la
-rwxr-xr-x 1 root root 871255 Mar  3 14:01 libdispatch.so
$ cd ~/kitura
$ swift build -Xcc -fblocks -Xlinker -I/usr/local/lib -Xswiftc -I/usr/local/include
Compiling Swift Module 'LoggerAPI' (1 sources)
Compiling Swift Module 'BlueSocket' (3 sources)
Compiling Swift Module 'SwiftyJSON' (2 sources)
Compiling Swift Module 'KituraSys' (4 sources)
/home/eimantas/kitura/Packages/Kitura-Sys-0.3.1/Sources/KituraSys/SysUtils.swift:17:8: error: no such module 'Dispatch'
import Dispatch
       ^
/home/eimantas/kitura/Packages/Kitura-Sys-0.3.1/Sources/KituraSys/SysUtils.swift:17:8: error: no such module 'Dispatch'
import Dispatch
       ^
/home/eimantas/kitura/Packages/Kitura-Sys-0.3.1/Sources/KituraSys/SysUtils.swift:17:8: error: no such module 'Dispatch'
import Dispatch
       ^
/home/eimantas/kitura/Packages/Kitura-Sys-0.3.1/Sources/KituraSys/SysUtils.swift:17:8: error: no such module 'Dispatch'
import Dispatch
       ^

[eimantas]

Verified:

$ cd /usr/local/include
$ ls -l dispatch
total 192
drwxr-xr-x 2 root root  4096 Mar  3 14:01 .
drwxr-xr-x 4 root root  4096 Mar  3 13:58 ..
-rw-r--r-- 1 root root  4536 Mar  3 14:01 base.h
-rw-r--r-- 1 root root 17716 Mar  3 14:01 block.h
-rw-r--r-- 1 root root 11014 Mar  3 14:01 data.h
-rw-r--r-- 1 root root  1631 Mar  3 14:01 dispatch.h
-rw-r--r-- 1 root root  8508 Mar  3 14:01 group.h
-rw-r--r-- 1 root root  4905 Mar  3 14:01 introspection.h
-rw-r--r-- 1 root root 25826 Mar  3 14:01 io.h
-rw-r--r-- 1 root root 14487 Mar  3 14:01 object.h
-rw-r--r-- 1 root root  2629 Mar  3 14:01 once.h
-rw-r--r-- 1 root root 34672 Mar  3 14:01 queue.h
-rw-r--r-- 1 root root  3300 Mar  3 14:01 semaphore.h
-rw-r--r-- 1 root root 26610 Mar  3 14:01 source.h
-rw-r--r-- 1 root root  2976 Mar  3 14:01 time.h

[eimantas]

The path to swift is following:

/home/eimantas/src/swift-3.0/usr/bin

[kfbishop]

Could the build do a quick check swift --version and show appropriate error message if < 3.0. I think overt hand-holding can greatly improve first time explorers.

[eimantas]

FWIW:

$ swift --version
Swift version 3.0-dev (LLVM b361b0fc05, Clang 11493b0f62, Swift fc261045a5)
Target: x86_64-unknown-linux-gnu

[mars-rover]

Your /use/local/include has no dispatch library, just some header files

[eimantas]

I thought include is supposed to have header files. And /usr/local/lib has all the binaries. No?

[vadimeisenbergibm]

@eimantas My mistake regarding /usr/local/include - please verify that dispatch directory exists in

<path-to-swift>/usr/lib/swift.

Step 4 of README should install it there.

[eimantas]

@vadimeisenbergibm it's not there. Should I attempt recompiling and reinstalling the libdispatch? I'm pretty sure I defined prexis as <path-to-swift-dir>

[vadimeisenbergibm]

@eimantas yes, make sure that you provide the correct path to config command.

[chrisozenne]

I am having the same problem on OS X with the latest Swift 2.2 from March 1st.
swift build error: unable to invoke subcommand: /Library/Developer/Toolchains/swift-2.2-SNAPSHOT-2016-03-01-a.xctoolchain/usr/bin/swift-build (No such file or directory)

I saw the comments above about installing the appropriate Swift 3.0 driver -- where can I find this?

[vadimeisenbergibm]

@chrisozenne Please install Swift 3.0 snapshot, 8th of February for the master branch of Kitura or 25th of February for the develop branch.

[chrisozenne]

Took me a while to figure this out - I could not find the Swift 3.0 snapshot because it's not called Swift 3.0, it's just called "Swift Development Snapshot" on Swift.org.

[vadimeisenbergibm]

@chrisozenne Correct, sorry, I should have mentioned that.

[eimantas]

Okay, I got it working! I got a "Hello world!"!!!11!!! I followed the instructions on the develop branch and it works great!

Thanks everyone for support!

For anyone bumping in to the same issue: I got it working with 02/25 development snapshot (which is named 2.2, but actually is future 3.0 version of Swift). Follow the instructions on develop branch.