Not open source but happy to share benchmarks if that would be useful.
Also, would you mind comparing it to Csmith (https://embed.cs.utah.edu/csmith/)?
I wasn't aware of Csmith so thanks for highlighting. My C code doesn't really test many features of the compiler so I suspect mainly of interest in seeing just how the compiler handles a really large single file.
Hardware 2016 12" MacBook (1.1GHz Core m3) Ubuntu 20.04 running in Docker Clang 9 -O0 optimisation (more optimisation increases the compile times a lot!)
0.53m LOC 41MB 34s
0.99m LOC 76MB 91s
1.44m LOC 110MB 167s
I suspect the code is relatively straightforward to compile - few function calls etc.
https://github.com/rindeal/Amalgamate
Which seems interesting, however when I tried the FreeType example, there seemed to be some preprocessing issue, such that some function definitions are conditionally excluded even though they are called later. I didn't have the time to find out if this was an issue in the original code or if the amalgamation script introduced it.
In any case, such single-C programs are very useful for quickly testing tools, so having more of them would be great.
So for every loop continue statement there is a GPL license text :D
In practice, it doesn't matter at all as the preprocessor replaces all license headers with a single space even before the compiler has the chance to look at it.
