ContributionsMost RecentMost LikesSolutionsRe: Failed to inline fprintf into *** (Callee is varargs) i have solved my problem, thanks for your helping Failed to inline fprintf into *** (Callee is varargs) While I'm using intel hls 21.2 to compile my *.c file, which have function "fprintf" in it, the hls compiler will report this error "Compiler Error: Failed to inline fprintf into ***(a function name in my design) (Callee is varargs) " . I'm using Visual Studio 2017 Developer Command Prompt v15.9.42, and I have quartus 18 with hls in my PC too, can someone helps me, thanks. PS: the same *.c file worked OK on my workmate's PC, and he has the same versions of intel hls