[llvm-bugs] [Bug 39692] New: LLVM from sources and "xcrun: error: unrecognized option: --show-sdk-version"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39692

            Bug ID: 39692
           Summary: LLVM from sources and "xcrun: error: unrecognized
                    option: --show-sdk-version"
           Product: libc++
           Version: 7.0
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: noloader at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

I'm working on an old PowerMac. MacPorts does not provide an updated Clang
compiler. I am trying to build LLVM/Clang from sources. I am bootstrapping the
process with MacPorts GCC 5 compiler (to satisfy the GCC 4.8 minimum).

My build script works fine on Fedora 29 x86_64. On the PowerMac it is having
some trouble. The build script is at https://github.com/noloader/build-llvm .

Here's the first sign of trouble on the PowerMac:

cmake ...

...
-- Performing Test LIBCXX_SUPPORTS_WNO_ERROR_FLAG
-- Performing Test LIBCXX_SUPPORTS_WNO_ERROR_FLAG - Success
-- Performing Test LIBCXX_SUPPORTS_EHSC_FLAG
-- Performing Test LIBCXX_SUPPORTS_EHSC_FLAG - Failed
-- Performing Test LIBCXX_SUPPORTS_FPIC_FLAG
-- Performing Test LIBCXX_SUPPORTS_FPIC_FLAG - Success
xcrun: error: unrecognized option: --show-sdk-version

usage:
xcrun [-verbose] [-no-cache] [-sdk <sdkroot>] [-log] [-run] <utility>
[argument...]
xcrun [-verbose] [-no-cache] [-sdk <sdkroot>] -find <utility>
<tool> [tool arguments ...]
-- Performing Test LIBCXX_SUPPORTS_STD_EQ_CXX14_FLAG
-- Performing Test LIBCXX_SUPPORTS_STD_EQ_CXX14_FLAG - Success
-- Adding Benchmark: algorithms.bench.cpp
-- Adding Benchmark: filesystem.bench.cpp

This seems to work, but I don't know if it is useful to this process:

$ /usr/bin/xcodebuild -version
Xcode 3.1.4
Component versions: DevToolsCore-1204.0; DevToolsSupport-1186.0
BuildVersion: 9M2809

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