problem in gperf makefile rules

[Assaf Gordon]

Hello,

I'm encountering some build errors during 'make' in projects using gnulib, and 
I suspect it has something to do with this commit:

   gperf: respect silent rules
   
http://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=30f4290277444b1d4825a42c9a33f2c3c7fe310a

The symptom I've found is that the GPERF/V_GPERF variables are expanded 
multiple times (or incorrectly):

    $ grep GPERF Makefile
    GPERF = gperf
    V_GPERF = lib/$(V_GPERF_$(V))
    V_GPERF_ = lib/$(V_GPERF_$(AM_DEFAULT_VERBOSITY))
    V_GPERF_0 = lib/@echo lib/"  lib/GPERF   lib/" lib/$@;

And result in errors such as:

    $ make
    lib/lib/gperf -m 10 ./lib/iconv_open-aix.gperf > ./lib/iconv_open-aix.h-t 
&& \
            mv ./lib/iconv_open-aix.h-t ./lib/iconv_open-aix.h
    /bin/bash: lib/lib/gperf: No such file or directory
    make: *** [lib/iconv_open-aix.h] Error 127


To reproduce, do the following:

    cd /tmp/
    git clone git://git.sv.gnu.org/coreutils.git
    cd coreutils
    ./bootstrap && ./configure && make

'make' will succeed. then try:

    $ rm lib/iconv_open-aix.h
    $ make V=0
    lib/lib/lib/@echo lib/"  lib/GPERF   lib/" lib/lib/iconv_open-aix.h;gperf -m 10 
./lib/iconv_open-aix.gperf > ./lib/iconv_open-aix.h-t && \
        mv ./lib/iconv_open-aix.h-t ./lib/iconv_open-aix.h
    /bin/bash: lib/lib/lib/@echo: No such file or directory
    [....]

and

    $ rm lib/iconv_open-aix.h
    $ make V=1
    lib/gperf -m 10 ./lib/iconv_open-aix.gperf > ./lib/iconv_open-aix.h-t && \
        mv ./lib/iconv_open-aix.h-t ./lib/iconv_open-aix.h
    /bin/bash: lib/gperf: No such file or directory
    make: *** [lib/iconv_open-aix.h] Error 127


regards,
 - assaf