[LLVMdev] LLD dynamic compilation

[Shankar Easwaran]

Hi Renato,

I think you are hitting a bug, the Observer pattern was added a few 
weeks back, and may be there is some sort of uninitialized variable ?

On the cyclic dependency there was a recent conversation that was trying 
to fix this, but I am not sure where it is.

Thanks

Shankar Easwaran

On 6/30/2014 4:29 AM, Renato Golin wrote:
> Folks,
>
> I'm having a look at LLD and I need some guidance...
>
> I know it's not production ready for x86 and ARM (the idea is to make
> it so). My steps:
>
> I've added it to tools/lld and ran CMake again (on x86_64) on a
> standard release build (static linking). It works, builds but I see
> one unit test error:
>
> Note: Google Test filter = InputGraphTest.Observer
> [==========] Running 1 test from 1 test case.
> [----------] Global test environment set-up.
> [----------] 1 test from InputGraphTest
> [ RUN      ] InputGraphTest.Observer
> 0  DriverTests     0x0000000000498f42
> 1  DriverTests     0x0000000000498c24
> 2  libpthread.so.0 0x00007f0ecbf7f4b0
> 3  DriverTests     0x0000000000462f6a
> 4  DriverTests     0x00000000005bc3a4
> 5  DriverTests     0x000000000046bb6f
> 6  DriverTests     0x0000000000478eea
> 7  DriverTests     0x0000000000479f58
> 8  DriverTests     0x000000000047a025
> 9  DriverTests     0x000000000047e5d0
> 10 DriverTests     0x000000000047e882
> 11 DriverTests     0x0000000000411656
> 12 libc.so.6       0x00007f0ecb1a3000 __libc_start_main + 240
> 13 DriverTests     0x00000000004169a7
>
> When trying to investigate, I then ran CMake on my debug build (that
> has dynamic linking to avoid re-linking of huge libraries during
> development cycle), and I got this:
>
> CMake Error: The inter-target dependency graph contains the following
> strongly connected component (cycle):
>    "lldPasses" of type SHARED_LIBRARY
>      depends on "lldNative" (weak)
>      depends on "lldYAML" (weak)
>    "lldNative" of type SHARED_LIBRARY
>      depends on "lldYAML" (weak)
>      depends on "lldPasses" (weak)
>    "lldYAML" of type SHARED_LIBRARY
>      depends on "lldNative" (weak)
>      depends on "lldPasses" (weak)
> At least one of these targets is not a STATIC_LIBRARY.  Cyclic
> dependencies are allowed only among static libraries.
>
> The error is clear, and the only way (I know) to make it compile
> dynamically is to remove the cyclic dependency.
>
> Question is: Why the cyclic dependency? Is that really necessary, or
> is that no one ever bothered?
>
> cheers,
> --renato
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