Debugging generated C code

To debug issues in the generated C code, you can pass these flags:

• -cg - produces a less optimized executable with more debug information in it.
• -showcc - prints the C command that is used to build the program.

For the best debugging experience, you can pass all of them at the same time: v -cg -showcc yourprogram.v, then just run your debugger (gdb/lldb) or IDE on the produced executable yourprogram.

If you just want to inspect the generated C code, without further compilation, you can also use the -o flag (e.g. -o file.c). This will make V produce the file.c then stop.

If you want to see the generated C source code for just a single C function, for example main, you can use: -printfn main -o file.c.

To see a detailed list of all flags that V supports, use v help, v help build and v help build-c.