Undefined symbols for architecture x86_64:
"_OBJC_CLASS_$_NSMutableArray", referenced from:
objc-class-ref in trash-571f39.o
"_OBJC_CLASS_$_NSURL", referenced from:
objc-class-ref in trash-571f39.o
"_OBJC_CLASS_$_NSUserDefaults", referenced from:
objc-class-ref in trash-571f39.o
objc-class-ref in HGCLIUtils-31f3b3.o
ld: symbol(s) not found for architecture x86_64
This also updates the bootstrap tool builder to LLVM 5, but not the ones
we actually use for bootstrap. I'll make that change in a subsequent commit
so as to provide traceable provenance of the bootstrap tools.
This is the newest sdk. I have skipped 9.3 for now but someone can
certainly add it if they need it for some reason.
Also I added a generic "xcode" that will always point to the newest
xcode that is available in Nixpkgs.
This reverts commit 0a944b345e, reversing
changes made to 61733ed6cc.
I dislike these massive stdenv changes with unclear motivation,
especially when they involve gratuitous mass renames like NIX_CC ->
NIX_BINUTILS. The previous such rename (NIX_GCC -> NIX_CC) caused
months of pain, so let's not do that again.
