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POHow to split in GNU makefile list of files into separate lines
 

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  1. POHow to split in GNU makefile list of files into separate lines
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    <p>I have a variable containing list of files separated with string <code>_NEWLINE_</code>. I need to output that variable into a file so that each file is in a separate line. The trick is that it needs to works on FreeBSD and Solaris.</p> <p>This is what I am trying now:</p> <pre><code>echo "lib/alarms-1.2/priv/snmp_conf/agent.conf: lib/alarms/priv/snmp_conf/agent.conf_NEWLINE_lib/alarms-1.2/priv/snmp_conf/agent.conf.src: lib/alarms/priv/snmp_conf/agent.conf.src_NEWLINE_lib/alarms-1.2/priv/snmp_conf/community.conf: lib/alarms/priv/snmp_conf/community.conf" | sed 's|_NEWLINE_|\'$'\n|g' </code></pre> <p>This works on FreeBSD and in shell on Solaris. But when run in GNUmakefile on Solaris I am getting this (notice $ at the end of each line):</p> <pre><code>lib/alarms-1.2/priv/snmp_conf/agent.conf: lib/alarms/priv/snmp_conf/agent.conf$ lib/alarms-1.2/priv/snmp_conf/agent.conf.src: lib/alarms/priv/snmp_conf/agent.conf.src$ lib/alarms-1.2/priv/snmp_conf/community.conf: lib/alarms/priv/snmp_conf/community.conf$ </code></pre> <p>If I remove <code>\'$'</code> from sed then it works on Solaris but doesn't on FreeBSD. Maybe there is a way of telling which version to use depending on which system the makefile is executed?</p> <p><strong>EDIT:</strong> Thanks to the solution proposed by <strong>bobbogo</strong> I created an exemplary makefile that provides the desired outcome and seems to be working on both FreeBSD and Solaris:</p> <pre><code>one-line := lib/alarms-1.2/priv/snmp_conf/agent.conf: lib/alarms/priv/snmp_conf/agent.conf_NEWLINE_lib/alarms-1.2/\ priv/snmp_conf/agent.conf.src: lib/alarms/priv/snmp_conf/agent.conf.src_NEWLINE_lib/alarms-1.2/priv/snmp_conf/comm\ unity.conf: lib/alarms/priv/snmp_conf/community.conf many-lines := { echo '$(subst _NEWLINE_,' &amp;&amp; echo ',${one-line})'; } .PHONY: all all: $(shell $(many-lines) &gt; test.txt) </code></pre>
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    1. COHaving read the accepted answer, it seems to me the the original `sed` method above is a much simpler way to go (see @Beta's answer). Use perl though. perl is one of the most portable languages around, and always trumps grep/sed/awk et. al. `echo '${one-line}' | perl -lpe 's/_NEWLINE_/\n/g'` maybe. (Or `perl -lpe 'BEGIN { $$/ = "_NEWLINE_" }'`—timtowtdi as the Perl folks say.)
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