(When programming in c)
It works on Ubuntu so why not on manjaro?
You have to provide more information of what are you doing. But I can say that #ifdef works just fine in Manjaro. This is a programming language feature, not an operating system thing, so whatever problem you have is in your code or in your settings (given that you are using a right compiler)
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That would depend on your previous defs - wouldn’t it?
I am not very knowledgable with C but it would seem you are missing some headers.
If I recall correct Ubuntu includes kernel headers by default but you have to install them specifically on Manjaro and Arch for that matter.
Ok. I now realized that the question is specific about #ifdef UNIX. I’m don’t know about Ubuntu, but gcc compiler seems to have some predefined macros that actually shouldn’t be there (see: https://stackoverflow.com/questions/19210935/why-does-the-c-preprocessor-interpret-the-word-linux-as-the-constant-1). Also in Manjaro.
Words like unix or linux are defined by default in this compiler, but notice that this is not 1989 ANSI C standard compatible and gcc compiler could change it’s behaviour in the future.
PS: I’m unable to find other references to #define UNIX in google, apart from your own question here (
) and a programming example that defines itself UNIX
Even worse, it’s compiler specific. For gcc, try gcc -dM -E - < /dev/null, it should list all predefined macros. And as documented, it defines unix, __unix and __unix__, but not UNIX.
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