It couldn't be overridden, and was defined as YES.
# the flag --with-gcc=<blah> instead. The reason is that the configure script
# needs to know which gcc you're using in order to perform its tests.
-UseGcc = YES
WhatGccIsCalled = @WhatGccIsCalled@
GccVersion = @GccVersion@
-GccLT34 = @GccLT34@
-ifneq "$(strip $(UseGcc))" "YES"
- CC = cc
-else
- CC = $(WhatGccIsCalled)
-endif
+GccLT34 = @GccLT34@
+CC = $(WhatGccIsCalled)
# C compiler and linker flags from configure (e.g. -m<blah> to select
# correct C compiler backend). The stage number is the stage of GHC