<p>
The bug is that 'make -pg' generates the following stuff for the
rule <code> foo\#bar.ext: ; @echo foo\#bar.ext = '$@' </code>:
</p>

<pre>
 foo#bar.ext:
 #  Implicit rule search has not been done.
 #  Modification time never checked.
 #  File has not been updated.
 #  commands to execute (from `./Makefile_qCzal', line 6):
       @echo foo\#bar.ext = '$@'
</pre>

<p>
where the first "#" character should have been escaped by "\" but doesn't. :(
</p>

<p>
In fact, meta characters like ':', '#', and '\' are all left unescaped in the makefile database output, which could result in ambiguous results and invalid makefile syntax.
</p>