Apologies for being slightly off-topic. For WebAssembly code generation, I 
need to build the latest bleeding-edge Spidermonkey, but this stopped 
working recently (I think after a recent Xcode update) with errors that 
look like C++11 constructs are used in the code but the compiler tries to 
compile the code with an earlier C++ version, e.g.:


/Users/floh/projects/inbound/js/src/build_OPT.OBJ/dist/include/mozilla/TemplateLib.h:125:23:
 
warning:
      variadic templates are a C++11 extension [-Wc++11-extensions]
template<bool C1, bool... Cn>
                      ^
In file included from 
/Users/floh/projects/inbound/js/src/build_OPT.OBJ/memory/mozalloc/Unified_cpp_memory_mozalloc0.cpp:2:
In file included from 
/Users/floh/projects/inbound/memory/mozalloc/mozalloc.cpp:69:
/Users/floh/projects/inbound/js/src/build_OPT.OBJ/dist/include/mozilla/mozalloc.h:288:20:
 
warning:
      'nullptr' is a keyword in C++11 [-Wc++11-compat]
            return nullptr;


This is the system clang version:

Apple LLVM version 7.3.0 (clang-703.0.31)
Target: x86_64-apple-darwin15.5.0
Thread model: posix
InstalledDir: 
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Anybody experiencing the same and has found a solution, or what's the best 
place to go with this (ticket on Bugzilla, or a specific discussion 
group/mailing list)?

Thanks!
-Floh.

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