> On Mar 19, 2016, at 12:05 PM, ChrisBieneman <be...@apple.com> wrote:
>
> [Adding Vedant directly]
>
> I'm not super familiar with the swift build scripts, but I have a theory of
> what is going wrong. I think the problem is that compiler-rt is being built
> during the cross build, and it really shouldn't be.
>
> The compiler-rt build system has some significant flaws, and it is being
> reworked to resolve them. The problem causing this is that we have a hacked
> up CMake build process that generates multiple cross-targeted binaries from a
> single build configuration. I believe that compiler-rt's built-in hacky
> cross-targeting is tripping over however swift is supporting cross-targeting,
> and it is falling over.
>
> With the current state of compiler-rt the right way to build it for Darwin is
> to treat it as host content, and it will build the Darwin-cross libraries
> too. Then you can pull the cross-libraries out and put them into the device
> build.
Could you elaborate on what it means to treat it as host content?
Is setting COMPILER_RT_HOST_TRIPLE and disabling
COMPILER_RT_ENABLE_{I,TV,WATCH}OS the right thing to do?
> Vedant, if you have questions feel free to swing by my office on Monday.
Will do.
thanks,
vedant
> -Chris
>
> On Mar 19, 2016, at 10:11 AM, Andrew Hyatt via swift-dev
> <swift-dev@swift.org> wrote:
>
>> (From /u/thegreatbeanz on reddit.com/r/swift)
>>
>> So the problem here is actually that something has gone horribly wrong when
>> configuring compiler- rt.
>> You'll notice in the clang commands that it is building in this directory:
>> clang_rt.builtins_armv7_10.4.dir
>> What that means is it is building the clang_rt.10.4 archive which provides
>> back ported library functions to OS X 10.4. Obviously 10.4 didn't support
>> armv7 as an architecture, something has gone really wrong here.
>> If you're on the latest swift it is probably a regression caused by 53f48f8.
>> You need to email swift-dev to get support from Dmitri Gribenko and Vedant
>> Kumar.
>> Source: I wrote most of the compiler-rt builtin build system for Darwin.
>>
>> Andrew Hyatt
>> ahyatt...@icloud.com
>>
>>> On Mar 19, 2016, at 9:26 AM, Andrew Hyatt via swift-dev
>>> <swift-dev@swift.org> wrote:
>>>
>>> Building swift-llvm fails when using build-script to cross compile because
>>> build-script wrongly gives duplicate -isysroot arguments.
>>>
>>> The full arguments that are given to clang by build-script while building
>>> LLVM are here: https://gist.github.com/ahyattdev/8ecc5d3808b9ee543a60
>>>
>>> The command I use to build the compiler, using the latest sources from
>>> GitHub
>>>
>>> utils/build-script -R -i -- --cross-compile-tools-deployment-targets
>>> "iphoneos-arm64 iphoneos-armv7 iphoneos-armv7s"
>>> --user-config-args="-DLLVM_ENABLE_BACKTRACES=Off"
>>>
>>> This error occurs after the phase of building llvm for the host machine,
>>> and occurs during the cross compilation phase.
>>>
>>> Andrew Hyatt
>>> andythehy...@gmail.com
>>>
>>> _______________________________________________
>>> swift-dev mailing list
>>> swift-dev@swift.org
>>> https://lists.swift.org/mailman/listinfo/swift-dev
>>
>> _______________________________________________
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