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POWriting contents of makefile (>131000 chars) variable to a file?
 

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    <p>How can I write the contents of a makefile variable to file, without invoking a shell command? The problem is that the contents of the variable is possible longer than the shell allows for a command (i.e. longer than MAX_ARG_STRLEN (131072) characters).</p> <p>In particular, in a makefile I have a variable containing a long list of filenames to process (including their absolute pathes for out-of-source builds). Now I need to write those filenames to a (temporary) file, which I can then pass to another command.</p> <p>So far, we had a rule like (<code>$COLLATED_FILES</code> is the variable containing the paths):</p> <pre><code>$(outdir)/collated-files.tely: $(COLLATED_FILES) $(LYS_TO_TELY) --name=$(outdir)/collated-files.tely --title="$(TITLE)" \ --author="$(AUTHOR)" $^ </code></pre> <p>This breaks if <code>COLLATED_FILES</code> is longer than about 130000 characters, we get the error message:</p> <pre><code>make[2]: execvp: /bin/sh: Argument list too long </code></pre> <p>As a solution, we are now trying to write the contents of the variable to a file and use that file in the <code>$(LYS_TO_TELY)</code> command. Unfortunately, I have not yet found a way to do this without invoking the shell. My attempts include:</p> <pre><code>$(outdir)/collated-files.list: $(COLLATED_FILES) echo "" &gt; $@ $(foreach f,$^,echo $f &gt;&gt; $@;) </code></pre> <p>But this also invokes all <code>echo</code> commands at once in a shell, so the shell command is just as long.</p> <p>Is there any way to write the contents of <code>$(COLLATED_FILES)</code> to a file on disk without passing them on the command line to a shell command?</p> <p>I also searched whether I could pipe the contents of the variable to the shell, but I couldn't find anything in that direction, either...</p>
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