How do I find out why g++ takes a very long time on a particular file?

Question

I am building a lot of auto-generated code, including one particularly large file (~15K lines), using a mingw32 cross compiler on linux. Most files are extremely quick, but thi

Answer 1

Related to @Goz and @Josh_Kelley, you can get gcc/g++ to spit out the preprocessed source (with #includes inline) using -E. That's one way to determine just how large your source is.

And if the compiler itself is the problem, you may be able to strace the compile command that's taking a long time to see whether there's a particular file access or a specific internal action that's taking a long time.