[cfe-dev] MacOS compiler-rt build failed with master branch

[Dan Liew via cfe-dev]

On Sat, 26 Oct 2019 at 22:32, Aditya Atluri <aditya.gpu01 at gmail.com> wrote:
>
> Hi Dan,
> I wasn't expecting a response from you. So, I didn't put effort in
writing a detailed email. I am running macOS Mojave (10.14.6)
>
> Attached build script and test program.

The test program isn't really of any use. Your script doesn't succeed in
building clang

```
ninja: error: loading 'build.ninja': No such file or directory
Unable to build llvm
```

so there isn't a build of clang available for you to use.


> Let me know if you need any more information
>
> Here is the output log:
>
> -- Sphinx disabled.
>
> -- Linker detection: ld64
>
> -- Found OSX_SYSROOT:
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk
>
> ERRORCould not detect OS X Sysroot. Either install Xcode or the Apple
Command Line Tools

That error indicates something is wrong with your compiler toolchain (i.e.
what you are using to build llvm/clang/etc...)

> -- Got ld supported ARCHES: armv6 armv7 armv7s arm64 arm64e arm64_32 i386
x86_64 x86_64h armv6m armv7k armv7m armv7em
>
> -- Toolchain supported arches:
armv6;armv7;armv7s;arm64;arm64e;arm64_32;i386;x86_64;x86_64h;armv6m;armv7k;armv7m;armv7em
>
> -- Finding valid architectures for osx...
>
> CMake Error at
projects/compiler-rt/cmake/Modules/CompilerRTDarwinUtils.cmake:68 (message):
>
>   Failed to determine SDK version for "macosx" SDK
>
> Call Stack (most recent call first):
>
>   projects/compiler-rt/cmake/Modules/CompilerRTDarwinUtils.cmake:125
(find_darwin_sdk_version)

This probably means the call to the following command failed

```
xcodebuild -version -sdk macosx Path
```

That command should work even with just the "Apple Command Line Tools". If
it doesn't, then that's a problem. However, based on the other error
message it sounds like something is wrong with compiler toolchain.

>
>   projects/compiler-rt/cmake/config-ix.cmake:401 (darwin_test_archs)
>
>   projects/compiler-rt/CMakeLists.txt:234 (include)
>
>
>
> -- Configuring incomplete, errors occurred!
>
> See also
"/Users/aditya/Code/llvm10_x86_64_build_lnx/build_10_x86_64_llvm/CMakeFiles/CMakeOutput.log".
>
> See also
"/Users/aditya/Code/llvm10_x86_64_build_lnx/build_10_x86_64_llvm/CMakeFiles/CMakeError.log".
>
> ninja: error: loading 'build.ninja': No such file or directory
>
> Unable to build llvm

Your script `get_llvm_v2.sh` is pulling LLVM sources from the wrong
location. LLVM moved to a monorepo layout last week and your script is
pulling from the unofficial mirror of LLVM on GitHub.
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