build failure on macOS

[josefsachsconning]

fresh clone of master branch at 19f81ac

[ 75%] Building CXX object lib/ExecutionEngine/Orc/CMakeFiles/LLVMOrcJIT.dir/OrcMCJITReplacement.cpp.o
[ 75%] Building CXX object lib/ExecutionEngine/Orc/CMakeFiles/LLVMOrcJIT.dir/OrcRemoteTargetRPCAPI.cpp.o
In file included from /Users/sachs/src/julia-master/deps/srccache/llvm-3.9.1/lib/ExecutionEngine/Orc/OrcRemoteTargetRPCAPI.cpp:10:
In file included from /Users/sachs/src/julia-master/deps/srccache/llvm-3.9.1/include/llvm/ExecutionEngine/Orc/OrcRemoteTargetRPCAPI.h:21:
In file included from /Users/sachs/src/julia-master/deps/srccache/llvm-3.9.1/include/llvm/ExecutionEngine/Orc/RPCUtils.h:35:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/future:1447:23: error:
      'future_error' is unavailable: introduced in macOS 10.8
                      future_error(make_error_code(future_errc::broken_promise))
                      ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/future:502:63: note:
      'future_error' has been explicitly marked unavailable here
class _LIBCPP_EXCEPTION_ABI _LIBCPP_AVAILABILITY_FUTURE_ERROR future_error
                                                              ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/future:1621:23: error:
      'future_error' is unavailable: introduced in macOS 10.8
                      future_error(make_error_code(future_errc::broken_promise))
                      ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/future:502:63: note:
      'future_error' has been explicitly marked unavailable here
class _LIBCPP_EXCEPTION_ABI _LIBCPP_AVAILABILITY_FUTURE_ERROR future_error
                                                              ^
2 errors generated.
make[4]: *** [lib/ExecutionEngine/Orc/CMakeFiles/LLVMOrcJIT.dir/OrcRemoteTargetRPCAPI.cpp.o] Error 1
make[3]: *** [lib/ExecutionEngine/Orc/CMakeFiles/LLVMOrcJIT.dir/all] Error 2
make[2]: *** [all] Error 2
make[1]: *** [scratch/llvm-3.9.1/build_Release/build-compiled] Error 2
make: *** [julia-deps] Error 2

[josefsachsconning]

My previous successful build was at 229d096

[dpsanders]

FWIW, I'm seeing the same.

[andreasnoack]

Try to merge #18910 and distclean-llvm

[josefsachsconning]

When I apply the changes in #18910, the build succeeds.

[dpsanders]

👍

[stevengj]

I'm on macOS 10.12.2, and initially got the future_error above, then pulled the latest master and did make -C deps distclean-llvm && make, and now I'm getting

Scanning dependencies of target clang_rt.eprintf
[ 38%] Building C object projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.eprintf.dir/eprintf.c.o
clang: error: invalid deployment target for -stdlib=libc++ (requires OS X 10.7 or later)
make[4]: *** [projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.eprintf.dir/eprintf.c.o] Error 1
make[3]: *** [projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.eprintf.dir/all] Error 2
make[2]: *** [all] Error 2
make[1]: *** [scratch/llvm-3.9.1/build_Release/build-compiled] Error 2

[andreasnoack]

Might be #18920

[stevengj]

Ah, thanks.

(One thing that might be helpful is to include the error message that a PR solves in the PR, so that searching for e.g. "invalid deployment target" will turn up the PR.)