Yup.  This has been a recurrent problem for parallel builds.  <div><br></div><div>There&#39;s been some prior work on tracking it down, possibly attributable to time stamp granularity or some hiccup in the dependencies. </div>
<div><br></div>Does anyone know what the relevant ticket on track is?<span></span><br><div><div><br>On Monday, August 5, 2013, Kazu Yamamoto  wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi,<br>
<br>
I&#39;m using GHC head (32bit) on Mac. Recently, building GHC head<br>
stops:<br>
<br>
----<br>
% make maintainer-clean; perl boot; ./configure --prefix=/ghc-head; make -j3<br>
ranlib: file: .libs/libgmp.a(mp_clz_tab.o) has no symbols<br>
ranlib: file: .libs/libgmp.a(obprintf.o) has no symbols<br>
ranlib: file: .libs/libgmp.a(obvprintf.o) has no symbols<br>
ranlib: file: .libs/libgmp.a(obprntffuns.o) has no symbols<br>
ranlib: file: .libs/libgmp.a(repl-vsnprintf.o) has no symbols<br>
libtool: link: rm -fr .libs/libgmp.lax<br>
libtool: link: ( cd &quot;.libs&quot; &amp;&amp; rm -f &quot;<a href="http://libgmp.la" target="_blank">libgmp.la</a>&quot; &amp;&amp; cp -p &quot;../<a href="http://libgmp.la" target="_blank">libgmp.la</a>&quot; &quot;<a href="http://libgmp.la" target="_blank">libgmp.la</a>&quot; )<br>

cp libraries/integer-gmp/gmp/gmpbuild/gmp.h libraries/integer-gmp/gmp/<br>
cp libraries/integer-gmp/gmp/gmpbuild/.libs/libgmp.a libraries/integer-gmp/gmp/<br>
inplace/bin/mkdirhier libraries/integer-gmp/gmp/objs<br>
cd libraries/integer-gmp/gmp/objs &amp;&amp; /usr/bin/ar x ../libgmp.a<br>
ranlib libraries/integer-gmp/gmp/libgmp.a<br>
ranlib: file: libraries/integer-gmp/gmp/libgmp.a(mp_clz_tab.o) has no symbols<br>
ranlib: file: libraries/integer-gmp/gmp/libgmp.a(obprintf.o) has no symbols<br>
ranlib: file: libraries/integer-gmp/gmp/libgmp.a(obvprintf.o) has no symbols<br>
ranlib: file: libraries/integer-gmp/gmp/libgmp.a(obprntffuns.o) has no symbols<br>
ranlib: file: libraries/integer-gmp/gmp/libgmp.a(repl-vsnprintf.o) has no symbols<br>
make: *** [all] Error 2<br>
%<br>
----<br>
<br>
One more &quot;make -j3&quot; finishes the building. I&#39;m sure that this does not<br>
happen before.<br>
<br>
Are there any guys who get this problem?<br>
<br>
--Kazu<br>
<br>
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</blockquote></div></div>