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POWhy isn't my eval function in my Makefile working?
 

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  1. POWhy isn't my eval function in my Makefile working?
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    <p>When I try to run the following make file (updated with suggestions below):</p> <pre><code># Build Directories src_dir=src obj_dir=obj bin_dir=bin cc=cl cc_flags= configs = dbg rel # create the directory for the current target. dir_guard=@mkdir -p $(@D) # source files src = MainTest.cpp define build_template = # object files - replace .cpp on source files with .o and add the temp directory prefix obj_$(1) = $$(addprefix $$(obj_dir)/$(1)/, $$(addsuffix .obj, $$(basename $$(src)))) testVar = "wooo" # build TwoDee.exe from all of the object files. $$(bin_dir)/$(1)/MainTest.exe : $$(obj_$(1)) $$(dir_guard) $$(cc) -out:$$@ $$(obj_$(1)) -link # build all of the object files in the temp directory from their corresponding cpp files. $$(obj): $$(obj_dir)/$(1)/%.obj : $$(src_dir)/%.cpp $$(dir_guard) $$(cc) $$(cc_flags) -Fo$$(obj_dir)/$$(1) -c $$&lt; endef $(foreach cfg_dir,$(configs),$(eval $(call build_template,$(cfg_dir)))) release: $(bin_dir)/rel/MainTest.exe debug: cc_flags += -Yd -ZI debug: $(bin_dir)/dbg/MainTest.exe $(warning testVar $(testVar)) </code></pre> <p>All I get is:</p> <pre><code>$ make Makefile:41: testVar make: *** No rule to make target `bin/rel/MainTest.exe', needed by `release'. Stop. </code></pre> <p>You can see from the output that the testVar variable is never set. I made these changes based on my last question: <a href="https://stackoverflow.com/questions/11331390/why-doesnt-my-makefile-target-specific-variable-work">Why doesn&#39;t my makefile target-specific variable work?</a></p>
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    1. COJust a note: you might want to replace those `$(dir_guard)` lines with [order-only prerequisites](http://www.gnu.org/software/make/manual/html_node/Prerequisite-Types.html#Prerequisite-Types) in order to avoid superfluous calls to `mkdir`.
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      1. POWhy isn't my eval function in my Makefile working?
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    2. COAlso note that you might want to have the compiler flags set in the template, instead of inheriting them from the `debug` target. Currently, running make without argument will build `bin/dbg/MainTest.exe`, as that's the first target in the file. It will do so without the debugging flags. Even if you declare a target `all` up front, there might be situations where you want to build individual targets. It would be better to ensure that any object within `obj/dbg/` always gets compiled with the debug options.
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      1. POWhy isn't my eval function in my Makefile working?
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