inconsistent CFLAGS between toplevel and gcc/

[Ben Elliston <bje at au1 dot ibm dot com>]

I have recently been noticing inconsistent warnings when building GCC (for example,
warnings about uninitialised variables in gcc/ddg.c).  I had not realised it, but the
top-level CFLAGS defaults to "-g -O2" whereas gcc's Makefile sets CFLAGS to "-g" by
default.  So, if you compile this way:

  cd gcc; make

you miss uninitalised warnings and the like caught by:
  make all-gcc

at the toplevel.  Why shouldn't gcc's CFLAGS include -O2 given that most end-users
are building using the toplevel Makefile?

Cheers, Ben

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