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If I have a code, fully written in C, using only libraries written also in C, and I have a compiler, like GCC, supporting many platforms, can I be sure that this code will run for any architecture supported by compiler? For example, can I take Flex or CPython , compile and use it, let say, at AVR?
Edit:
“fully written in C” doesn’t guarantee in any way that the code is portable. A portable compiler like GCC abstracts away the CPU architecture details, but the moment you use a system call specific to a particular OS, your code becomes unportable unless you surround the fragment in an
#ifdef WHATEVER_OS. This is why standards like POSIX have emerged to unify the system call interface across different operating systems.Limiting your code to the POSIX-defined system calls and using a POSIX-compliant operating system should generally stop you from worrying, with little exceptions.