Profiling the C++ compilation process

Question

I tend to write rather large templated header-only C++ libraries and my users commonly complain about compilation times. After thinking about the matter, it occurred to me t

Answer 1

Others have already suggested the -ftime-report command line flag for GCC, which makes the compiler print some statistics about the time consumed by each compilation phase. The drawback is that it only shows summary for one unit.

I've written a Python script, which allows to print total summary on all units, by each compilation phase, given the project build log file. It also allows sorting by different phases. And it also allows to compare two log files (e.g., if you're trying to understand the impact of your changes).