./configure IGNORES --with-gcc=gcc-4.8, can't build head on os x 10.8 with xcode 5 installed

Im seeing the build scripts using gcc instead of gcc-4.8

this is problematic! with xcode 5, gcc IS an old version of clang!

attaching a copy of the build log.

i'm using 7.6.3 to build this, and the ghc 7.6.3 settings file is pointing to gcc-4.8, so it can only be the build system. I think

[("GCC extra via C opts", " -fwrapv"),
 ("C compiler command", "gcc-4.8"),
 ("C compiler flags", " -m64 -fno-stack-protector  -m64"),
 ("ar command", "/usr/bin/ar"),
 ("ar flags", "clqs"),
 ("ar supports at file", "@ArSupportsAtFile@"),
 ("touch command", "touch"),
 ("dllwrap command", "/bin/false"),
 ("windres command", "/bin/false"),
 ("perl command", "/usr/bin/perl"),
 ("target os", "OSDarwin"),
 ("target arch", "ArchX86_64"),
 ("target word size", "8"),
 ("target has GNU nonexec stack", "False"),
 ("target has .ident directive", "True"),
 ("target has subsections via symbols", "True"),
 ("LLVM llc command", "llc"),
 ("LLVM opt command", "opt")
 ]

is host 7.6.3 ghc setup

Trac metadata

Trac field	Value
Version	7.7
Type	Bug
TypeOfFailure	OtherFailure
Priority	highest
Resolution	Unresolved
Component	Compiler
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