Cygwin：Windows上的Linux？ 如何确保Windows创建的程序适用于Linux

Question

we have a school project and it requires our C programs to work on Linux and is c99 compatible. Since I am working on Windows 10, I installed Cygwin and assumed that if it will compile in cygwin, it will most certainly work in Linux. It works fine with windows and I tried to compile it in cygwin and it works as well. So can I assure that it will work in Linux and is C99 Compatible? If no, why not? I am only using stdio and stdlib

Answer 1

You can never be sure. Even though your program seems to work it may still contain bugs that invoke undefined behaviour.

However, you can reduce the risk of malfunctions by using best practice, for example:

Heed compiler warnings

Turn up compiler warning. For example:

gcc -Wall -Wextra -pedantic -std=c99

This turns up the warning level to a fairly high level. . Compiler warnings are often indications of bugs, so fix them all. To ensure that you fix them, add -Werror so you can't run your code until all warnings have been fixed.

-std=c99 tells the compiler to use the rules for the C99 version of the C standard. The current version is C11 ( -stdc11 ). This is an important flag, and if omitted gcc defaults to the older C89 standard.

Use a tool to detect invalid use of memory

Tools like Valgrind (linux) will report common memory bugs like buffer overruns and memory leaks. Not sure which tool is most often used in Windows, but there is a wide selection listed here .

Answer 2

If it is vanilla C99, at 99.9% if works on Cygwin it will work on any Linux. I never saw a case that did not work.

Reverse is not always true, I would estimate ~ 98%, as linking could give some headache on some corner case.