[llvm-bugs] [Bug 24864] New: compiler-rt config-ix.cmake missing link flag for iOS simulator

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=24864

            Bug ID: 24864
           Summary: compiler-rt config-ix.cmake missing link flag for iOS
                    simulator
           Product: Build scripts
           Version: trunk
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: cmake
          Assignee: unassignedbugs at nondot.org
          Reporter: aw1621107 at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

On OS X 10.11, Xcode/CLT 7.1, trunk build through homebrew using "brew install
llvm --with-clang --with-lldb --HEAD --debug --verbose" and this formula:
https://gist.github.com/aw1621107/dccde531d91349d3eaee

During this build, ld refuses to link libclang_rt.asan_iossim_dynamic.dylib
when compiling the address sanitizer. Instead of looking in the iOS simulator
SDK, it goes straight to /usr/lib, resulting in the build failing with the
message "building for iOS simulator, but linking against dylib built for OS X
(architecture x86_64)"

Turns out that setting -sysroot during the link step did not seem to set the
sysroot for the ld call. I fixed this issue by adding a ld-specific sysroot
flag to projects/compiler-rt/cmake/config-ix.cmake under line 343:

-Wl,-syslibroot ${IOSSIM_SDK_DIR}

While this works on my machine, I'm not 100% sure that this will work for
everyone, as the build fails at a later point with a different error message.
In addition, it appears that this problem does not affect every OS X machine,
as some users on IRC were able to build trunk just fine.

If more information is required, I'll be happy to provide it.

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