To modify the flags passed to the julia and cc compiler invocations by JuliaC, I’m using it programmatically. To modify the arguments passed to julia I can use julia_args. If I use the JuliaC binary (juliac) I can pass arguments passed to julia using the -- separator. To modify the compile command (both the compiler used and the flags passed to it) I’m using JULIA_CC. The recipe API can be found in the struct definitions