[taylodl]

C couldn't keep that promise because C never made that promise! C had system-dependent implementations from the start. You were never promised that source code targeting execution on one platform would work as expected if targeted to another platform. Making truly platform-independent C code is arduous work requiring a lot of #ifdef/#ifndef and testing.

[gnabgib]

Yeah, it's a Java slogan: https://en.wikipedia.org/wiki/Write_once,_run_anywhere