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[SR-4727] Inline asm error when building swift_overlay.o on aarch64 #47304

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swift-ci opened this issue Apr 28, 2017 · 6 comments
Closed

[SR-4727] Inline asm error when building swift_overlay.o on aarch64 #47304

swift-ci opened this issue Apr 28, 2017 · 6 comments
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arm Architecture: any ARM armv8 Architecture: ARMv8 bug A deviation from expected or documented behavior. Also: expected but undesirable behavior.

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@swift-ci
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Previous ID SR-4727
Radar None
Original Reporter helge (JIRA User)
Type Bug
Status Resolved
Resolution Done

Attachment: Download

Environment

uname -a
Linux scw-66d779 4.9.23-std-1 #1 SMP Mon Apr 24 13:18:14 UTC 2017 aarch64 aarch64 aarch64 GNU/Linux
cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.2 LTS"
cat /proc/cpuinfo
processor : 0
BogoMIPS : 200.00
Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics
CPU implementer : 0x43
CPU architecture: 8
CPU variant : 0x1
CPU part : 0x0a1
CPU revision : 1
...

Additional Detail from JIRA
Votes 0
Component/s
Labels Bug, arm, armv8
Assignee None
Priority Medium

md5: 92fb892c95274f8eb937f0f16d918d0b

Issue Description:

I'm trying to build Swift 3.1.1 on a Scaleway ARMv8 instance. Hacking around SR-4726, libdispatch fails next on me when building the `swift_overlay.o`:

/swiftsrc/swift-corelibs-libdispatch/src/swift/Dispatch.swift:99:4: warning: default will never be executed
                        default: return nil
                        ^
<inline asm>:1:27: error: unexpected token in argument list
        mov     fp, fp          ; marker for objc_retainAutoreleaseReturnValue
                                             ^
LLVM ERROR: Error parsing inline asm

Makefile:998: recipe for target '/swiftsrc/build/buildbot_linux/libdispatch-linux-aarch64/src/swift/swift_overlay.o' failed
@belkadan
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Hm, what compiler is being used to build here? Can you get it to build with Clang?

@belkadan
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Or is it using the just-built Clang?

@swift-ci
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Comment by Helge Heß (JIRA)

Just look at the build log I attached:

/swiftsrc/build/buildbot_linux/llvm-linux-aarch64/bin/clang

The particular error comes from the clang build as part of the swift build. And the system compiler is clang-3.8, as that is the version which seems to work w/ Swift on ARM.

Here is the build script:

https://github.com/helje5/dockSwiftOnARM/blob/master/empty-ctx/build-3.1.1.sh#L51

@belkadan
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Oops, sorry, thanks.

@swift-ci
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swift-ci commented May 1, 2017

Comment by David Grove (JIRA)

I don't think this is really a libdispatch issue. It looks to me like the problematic asm directive is most likely being generated by configureARM64 in SwiftTargetInfo.cpp.

@compnerd
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I think that this was fixed a long time ago in clang. The marker is the autorelease elision marker.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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arm Architecture: any ARM armv8 Architecture: ARMv8 bug A deviation from expected or documented behavior. Also: expected but undesirable behavior.
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@compnerd @belkadan @swift-ci