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    <p>I've always thought this was easier to learn with a detailed example, so here's how I think of makefiles. For each section you have one line that's not indented and it shows the name of the section followed by dependencies. The dependencies can be either other sections (which will be run before the current section) or files (which if updated will cause the current section to be run again next time you run <code>make</code>).</p> <p>Here's a quick example (keep in mind that I'm using 4 spaces where I should be using a tab, Stack Overflow won't let me use tabs):</p> <pre><code>a3driver: a3driver.o g++ -o a3driver a3driver.o a3driver.o: a3driver.cpp g++ -c a3driver.cpp </code></pre> <p>When you type <code>make</code>, it will choose the first section (a3driver). a3driver depends on a3driver.o, so it will go to that section. a3driver.o depends on a3driver.cpp, so it will only run if a3driver.cpp has changed since it was last run. Assuming it has (or has never been run), it will compile a3driver.cpp to a .o file, then go back to a3driver and compile the final executable.</p> <p>Since there's only one file, it could even be reduced to:</p> <pre><code>a3driver: a3driver.cpp g++ -o a3driver a3driver.cpp </code></pre> <p>The reason I showed the first example is that it shows the power of makefiles. If you need to compile another file, you can just add another section. Here's an example with a secondFile.cpp (which loads in a header named secondFile.h):</p> <pre><code>a3driver: a3driver.o secondFile.o g++ -o a3driver a3driver.o secondFile.o a3driver.o: a3driver.cpp g++ -c a3driver.cpp secondFile.o: secondFile.cpp secondFile.h g++ -c secondFile.cpp </code></pre> <p>This way if you change something in secondFile.cpp or secondFile.h and recompile, it will only recompile secondFile.cpp (not a3driver.cpp). Or alternately, if you change something in a3driver.cpp, it won't recompile secondFile.cpp.</p> <p>Let me know if you have any questions about it.</p> <p>It's also traditional to include a section named "all" and a section named "clean". "all" will usually build all of the executables, and "clean" will remove "build artifacts" like .o files and the executables:</p> <pre><code>all: a3driver ; clean: # -f so this will succeed even if the files don't exist rm -f a3driver a3driver.o </code></pre> <p>EDIT: I didn't notice you're on Windows. I think the only difference is changing the <code>-o a3driver</code> to <code>-o a3driver.exe</code>.</p>
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    1. POHow to make a SIMPLE C++ Makefile?
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    1. COThe absolute code I'm trying to use is: p4a.exe: p4driver.cpp g++ -o p4a p4driver.cpp BUT, it tells me "missing separator". I'm using TAB, but it still tells me that. Any idea?
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    2. COAs far as I can tell, that error message only comes up if you have spaces. Make sure that you don't have any lines starting with spaces (space + tab will give that error). That's the only thing I can think of..
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