ghc-8.2.2 configure script fail to extract gcc version correctly

In GHC's configure script, there's a variable $fp_cv_gcc_version which contains gcc version by running one-line bash code.

    fp_cv_gcc_version="`$CC -v 2>&1 | grep 'version ' | sed -e 's/.*version [^0-9]*\([0-9.]*\).*/\1/g'`"

Following is gcc version info of my system.

Apple LLVM version 9.0.0 (clang-900.0.39.2)
Target: x86_64-apple-darwin17.4.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
Found CUDA installation: /usr/local/cuda, version 7.5

Expected value of fp_cv_gcc_version is 9.0.0. But CUDA version is extracted unexpectedly and attached to version info resulting buggy mk/config.mk like following.

GccVersion            = 9.0.0
7.5
ifeq "$(phase)" "0"
CrossCompilePrefix    =
...

Trac metadata

Trac field	Value
Version	8.2.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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