[Bug build/12869] New: `clean` and `distclean` does not properlyclean previous build

["noloader at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12869

           Summary: `clean` and `distclean` does not properly clean
                    previous build
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: minor
          Priority: P2
         Component: build
        AssignedTo: unassigned@sourceware.org
        ReportedBy: noloader@gmail.com


Originally, I built GDB with:

    ./configure
    make

After running, I examined config.log and thought I might tune the installation
a bit:

    ./configure CFLAGS="-g -O2 -DNDEBUG -m64 -mtune=core2"
    make

configure: error: `CFLAGS' has changed since the previous run:
configure:   former value:  `-g -O2'
configure:   current value: `-g -O2 -DNDEBUG -m64 -mtune=core2'
configure: error: in `/Users/jeffrey/Desktop/gdb-7.2/intl':
configure: error: changes in the environment can compromise the build
configure: error: run `make distclean' and/or `rm ./config.cache' and start
over
make[1]: *** [configure-intl] Error 1

OK, should be no problem:

    make distclean
    make clean
    rm -rf ./config.cache

Start again:

    ./configure CFLAGS="-g -O2 -DNDEBUG -m64 -mtune=core2"
    make

configure: error: `CFLAGS' has changed since the previous run:
configure:   former value:  `-g -O2'
configure:   current value: `-g -O2 -DNDEBUG -m64 -mtune=core2'
configure: error: in `/Users/jeffrey/Desktop/gdb-7.2/intl':
configure: error: changes in the environment can compromise the build
configure: error: run `make distclean' and/or `rm ./config.cache' and start
over
make[1]: *** [configure-intl] Error 1

I forgot how much I disliked automake and friends.

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