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problem in gperf makefile rules

From: Assaf Gordon
Subject: problem in gperf makefile rules
Date: Fri, 18 Dec 2015 16:10:30 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0


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

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_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


    $ 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

 - assaf

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