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POWhy doesn't my makefile target-specific variable work?
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  1. POWhy doesn't my makefile target-specific variable work?
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    copied!<p>I am trying to make a makefile which does the following:</p> <ul> <li>gets source files from the <strong>src</strong> directory</li> <li>puts object files in the <strong>obj</strong> directory</li> <li>puts binary files in the <strong>bin</strong> directory</li> <li>puts release targets in the <strong>rel</strong> directory</li> <li>puts debug targets in the <strong>dbg</strong> directory</li> </ul> <p>The first problem i'm having is that my target-specific variables don't seem to be working here is the makefile:</p> <pre><code># Build Directories src_dir=src obj_dir=obj bin_dir=bin cc=cl cc_flags= # create the directory for the current target. dir_guard=@mkdir -p $(@D) # source files src = MainTest.cpp # object files - replace .cpp on source files with .o and add the temp directory prefix obj = $(addprefix $(obj_dir)/$(cfg_dir)/, $(addsuffix .obj, $(basename $(src)))) release: cfg_dir = rel release: executable debug: cfg_dir = dbg debug: cc_flags += -Yd -ZI debug: executable executable: $(bin_dir)/$(cfg_dir)/MainTest.exe # build TwoDee.exe from all of the object files. $(bin_dir)/$(cfg_dir)/MainTest.exe : $(obj) $(dir_guard) $(cc) -out:$@ $(obj) -link # build all of the object files in the temp directory from their corresponding cpp files. $(obj_dir)/$(cfg_dir)/%.obj : $(source_dir)/%.cpp $(dir_guard) $(cc) $(cc_flags) -Fo$(obj_dir)/$(cfg_dir) -c $&lt; </code></pre> <p>When I run make debug I get:</p> <pre><code>make: *** No rule to make target `obj//MainTest.obj', needed by `bin//MainTest.exe'. </code></pre> <p>There is also something else wrong because if I remove the debug and release variables and hardcode <strong>cfg_dir to rel</strong> I then get:</p> <pre><code>make: *** No rule to make target `obj/rel/MainTest.obj', needed by `bin/rel/MainTest.exe'. Stop. </code></pre> <p>So my object rule must also be wrong. I am new to make files so if anyone sees other things which are wrong, comments are welcome.</p>
 

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