[swift-dev] Building swift-llvm fails when using build-script to cross compile due to multiple -isysroot arguments being in CFLAGS

[Andrew Hyatt]

(From /u/thegreatbeanz on reddit.com/r/swift <http://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
ahyattdev at icloud.com

> On Mar 19, 2016, at 9:26 AM, Andrew Hyatt via swift-dev <swift-dev at 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 <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
> andythehyatt at gmail.com <mailto:andythehyatt at gmail.com>
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