C Which headers does this macro defined?

[Deleted member 66267]

I know FreeBSD defined itself as __FreeBSD__, but I don't know on which specific headers. Please help.

 

[zirias@]

None, this is built into the compiler when it targets FreeBSD.

 

[Deleted member 66267]

None, this is built into the compiler when it targets FreeBSD.

The most close thing I could find is __FreeBSD_version in <sys/param.h> (in the kernel) or <osreldate.h> (in userland).

 

[zirias@]

Well, again, it's builtin. You can list all predefined macros with clang -x c /dev/null -dM -E.
You can verify that this macro is builtin:

$ strings /usr/bin/clang | grep __FreeBSD__
__FreeBSD__