[SR-388] Swift REPL fails to launch on ARM

[hpux735]

Previous ID	SR-388
Radar	None
Original Reporter	@hpux735
Type	Bug

Additional Detail from JIRA

Votes	4
Component/s
Labels	Bug, arm, armhf, linux
Assignee	None
Priority	Medium

md5: 8ce4b131d10efde6968bd4f0294d6a7d

Issue Description:

wdillon@tegra-ubuntu:~/swift$ swift -v
Swift version 2.2-dev (LLVM 3ebdbb2c7e, Clang f66c5bb67b, Swift 9bd3eb7bc2)
Target: armv7-unknown-linux-gnueabihf
/home/wdillon/build/Ninja-ReleaseAssert/swift-linux-armv7/bin/swift -frontend -repl -target armv7-unknown-linux-gnueabihf -disable-objc-interop -color-diagnostics -module-name REPL
LLVM ERROR: Compiler-internal integrated REPL unimplemented for this platform; use the LLDB-enhanced REPL instead.
wdillon@tegra-ubuntu:~/swift$ swift -v -lldb-repl
Swift version 2.2-dev (LLVM 3ebdbb2c7e, Clang f66c5bb67b, Swift 9bd3eb7bc2)
Target: armv7-unknown-linux-gnueabihf
lldb "--repl=-target armv7-unknown-linux-gnueabihf -disable-objc-interop -color-diagnostics"
wdillon@tegra-ubuntu:~/swift$ lldb "--repl=-target armv7-unknown-linux-gnueabihf -disable-objc-interop -color-diagnostics"
-bash: lldb: command not found
wdillon@tegra-ubuntu:~/swift$ ../build/Ninja-ReleaseAssert/lldb-linux-armv7/bin/lldb "--repl=-target armv7-unknown-linux-gnueabihf -disable-objc-interop -color-diagnostics"
error: failed to launch REPL process: process launch failed: Lost debug server connection
wdillon@tegra-ubuntu:~/swift$

[hpux735]

This appears to have been addressed by Joe Bell https://github.com/hpux735/swift-lldb/commit/e3e023f54c69512a77a87dfc328b3a8e75a9e185

I'll need to verify it, and once it's merged into apple/swift-llvm I'll close this bug.

[hpux735]

I've implemented and tested a better fix that relies upon a diff at llvm, and a seperate diff at lldb. The problem is effectively resolved, it just needs to be merged in.

[hpux735]

I'm taking myself off of this bug for now. The problem is fairly easy to resolve in lldb, but the REPL is extremely unstable on ARM at the moment, even with that fix.

[swift-ci]

Comment by Joe (JIRA)

I've converted this from SR-40 subtask to a separate issue. Swift on ARM (for BeagleBone and Raspberry Pi 2 and 3 at least) has been working for some time. The REPL does not; I figured it deserved attention in its own right.