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POGnu Makefile, compile should fail
 

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    <p>I have a collection of examples that I want to <strong>make sure they fail to compile</strong>. What is the best way to to that with a *<em>GNU Makefile</em>?</p> <pre><code>test_nocompile: $(NOCOMPILE_CPP) for cpp in $(NOCOMPILE_CPP) ; do \ echo === $$cpp === ; \ if $(CXX) $(CXXFLAGS) -c -o fail.o $$cpp ; then echo ok ; else exit 1; fi ; \ done </code></pre> <p>As you can see, I have several difficulties here:</p> <ul> <li>Accessing the shell-for variable <code>cpp</code>: <code>$cpp</code>, <code>\$cpp</code> and <code>$$cpp</code> both do not work.</li> <li>Even with my <code>if</code> the make stops after the first g++-compile fails. But thats exactly what I want. I want failing to g++-compile to be considered the correct behaviour.</li> <li>Shell-for-loops in Makefiles are not the best idea. Is there a better way? I can not think of one, because since I expect the compiles to fail, I do not have a correct target, right?</li> </ul> <p>Advanced and optional:</p> <ul> <li>If I could manage to have the <em>fail-check</em> above working, I could try a second pass of compilation, this time with an additional <code>-DEXCLUDE_FAIL</code>, which takes out the offending line from my examples, and then the code should compile. Any idea?</li> <li>or should write a Python script for that...? ;-)</li> </ul> <p><strong>Edit:</strong></p> <p>I think my "advanced and optional" gave me a very good idea right now. I could use makes dependency checking again. Just a rough sketch here:</p> <pre><code> NOCOMPILE_CPP := $(wildcard nocompile/ *.cpp) NOCOMPILE_XFAILS := $(addsuffix .xfail,$(basename $(NOCOMPILE_CPP))) %.xfail: %.cpp if $(CXX) $(CXXFLAGS) -o $@ $&lt; ; then exit 1 ; else echo OK ; fi $(CXX) $(CXXFLAGS) -DEXCLUDE_FAILCODE -o $@ $&lt; test_nocompile: $(NOCOMPILE_XFAILS) </code></pre> <p>Is this elegant? Then I only have to work out how <code>-DEXCLUDE_FAILCODE</code> can make the failing tests work.... Non-trivial, but doable. I think that could do it, right?</p>
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