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POHow do I find out where the compiler spends its time?
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copied!<p>How do I find out where the <strong>compiler</strong> spends its time?</p> <p>My build is too slow, I'm already using a RAMdisk for the VC++ temporary files and it doesn't make any difference. (I have an SSD, so I expected no difference.)</p> <p>Most single C++ files in this project take approx. 2 seconds to compile which seems awful (as I also don't have any in-project parallelization because I'm using VS2005).</p> <p>How can I optimize this? Don't optimize without profiling, but how do I profile the compiler?</p> <p>Note: These were not really helpful: </p> <ul> <li><a href="https://stackoverflow.com/questions/13559818/profiling-the-c-compilation-process">Profiling the C++ compilation process</a></li> <li><a href="https://stackoverflow.com/questions/82128/displaying-build-times-in-visual-studio">Displaying build times in Visual Studio?</a> (It isn't completely without merit though ... if you do a single-file compilation, instead of the whole project, it will show the time taken for a single file: That way I see that quite some files here take more that 5 seconds, some even 10 sec when compiled stand-alone)</li> </ul> <hr> <p>Let's add a good comment: <em>Do you have lot's of templates? How large are your files on average? Do you checked on including only the minimum of necessary headers</em></p> <p>No, I did not. I could (and pro'lly will) of course. I may be able to find something, but it's all <strong>speculation</strong> and <strong>trial and error</strong>!</p> <p>"Everybody" tells you that you should only optimize after measuring/profiling, but when optimizing compilation times, we're back to trial&error?</p> <hr> <p>Note: The proposed "hack" from the comments with <code>__TIME__</code> does <em>not</em> work, at least not on Visual-C++, because (as <a href="http://msdn.microsoft.com/en-us/library/b0084kay%28v=vs.80%29.aspx" rel="nofollow noreferrer">the docs</a> state): <em>The <strong>most recent compilation time</strong> of the current source file. The time is a string literal of the form hh:mm:ss.</em> -- I guess one could at least get timings for single compilations units with this stamp, but it doesn't help to drill down into an compilation unit.</p>

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