[swift-users] Segmentation fault when running binary executable compiled from LLVM bitcode on Linux

[Jeffrey W]

Thanks a lot, Jordan!

I have filed a bug here <https://bugs.swift.org/browse/SR-5962>.

Jeffrey



2017-09-21 19:05 GMT-04:00 Jordan Rose <jordan_rose at apple.com>:

> Hm, I don’t see any inherent problems with splitting compilation like
> this, although it’s not something we test. The only thing I could think of
> is that Swift uses a custom calling convention on some platforms, but I
> would expect clang++ to refuse to compile the bc file at all if that were
> the issue. Mind filing a bug at https://bugs.swift.org ?
>
> Thanks,
> Jordan
>
>
> On Sep 21, 2017, at 13:42, Jeffrey W via swift-users <
> swift-users at swift.org> wrote:
>
> Hi swift team,
>
> I download the prebuilt swift 4.0 from here
> <https://swift.org/builds/swift-4.0-release/ubuntu1404/swift-4.0-RELEASE/swift-4.0-RELEASE-ubuntu14.04.tar.gz> and
> try to do some work on the generated LLVM BC. However, I got a seg fault
> when running the binary executable compiled from bitcode as shown below:
>
> $ cat hello.swift
> print("Hello World")
> $ swiftc hello.swift -emit-bc -o hello.bc
> $ clang++ hello.bc -c -o hello.o
> $ swiftc hello.o -o hello
> $ ./hello
> Segmentation fault (core dumped)
>
> It works fine if no bitcode file is involved here.
>
> $ swiftc hello.swift -c -o hello.o
> $ swiftc hello.o -o hello
> $ ./hello
> Hello World
>
> I am running Ubuntu 14.04.3 (kernel 4.8.0). I also encountered the same
> seg fault if I use the prebuilt swift 3.1.1
>
> Is it the right way to compile the bitcode generated from swift? Or is it
> a bug in swift ?
>
> Thanks a lot in advance!
>
> Best regards,
> Jeffrey
>
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