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| -rw-r--r-- | cbs.h | 13 |
1 files changed, 13 insertions, 0 deletions
@@ -20,6 +20,19 @@ #ifndef C_BUILD_SYSTEM_H #define C_BUILD_SYSTEM_H +/* Assert that the user is building for a supported platform. The only portable + way to check for POSIX is to validate that unistd.h exists. This is only + possible without compiler extensions in C23 (although some compilers support + it as an extension in earlier editions), so people compiling for pre-C23 + might not get this error if on a bad platform, and may end up being a bit + confused. + + It’s just a maybe though, this is nothing more than a sanity check for the + users sake. */ +#if defined(__has_include) && !__has_include(<unistd.h>) +# error "Non-POSIX platform detected" +#endif + #include <sys/stat.h> #include <sys/wait.h> |