I'm developing a Command-line tool in Xcode (exercise for university), but the editor is unable to include the standard C header file that provides I/O and files functions. When I compile, the build succeeds, so the problem is just the editor showing annoying errors. I tried installing the Xcode 11 Command-line tools from the Apple Developer site and also the ones for Xcode 11.2 beta. I can't seem to find the ones for Xcode 11.1, which is the version I'm using at the moment (build 11A1027).
Obviously, Xcode does include stdio.h. But the problem is that valid stdio.h code can sometimes report lots of errors within the Xcode IDE.
I experienced the same behavior you describe. In my case, even when the code was fixed, Xcode still reported alleged “errors”. Interestingly, even though the IDE reported these errors, it would build the app fine.
For me, this incorrect error reporting within the IDE went away when I emptied the “derived data” folder:
locate the derived data folder by go to preferences command+,, choose “Locations”, and then click on the arrow next to the “derived data” path:
quit Xcode;
empty the “derived data” folder; and
restart Xcode.
And, of course, add the missing *:
#import <stdio.h>
int main(int argc, const char * argv[]) {
FILE *fp;
fp = fopen("test.txt", "w");
if (fp) {
fputs("example\n", fp);
fclose(fp);
}
return 0;
}
