A project I’m working on compiles with -std=c89 -Wall -Wexta -Wpedantic -Werror tested using gcc, clang, tcc, musl-gcc, and musl-clang. The portability levels are getting out of control 
bonifartius 𒂼𒄄
@bonifartius Thanks :) actually not that bad. I wrote what I had before targeting POSIX 2008 and C11. Basically the only changes I had to do were: move my variable declarations to the top of each function, change bools to ints, and write my own implementations for functions in C89. So far the only functions I had to write that are in later standards are strdup and getline.
