[llvm-bugs] [Bug 51214] New: suggest including stdbool.h in C mode when missing definition of true/false, etc.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=51214

            Bug ID: 51214
           Summary: suggest including stdbool.h in C mode when missing
                    definition of true/false, etc.
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: hans at chromium.org
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

(From https://twitter.com/hansw2000/status/1419275810163331074)

Consider:

$ cat /tmp/a.c
#include <stdlib.h>

int foo();

int main() {
  while (true) { if (foo() == 42) break; }
}

$ clang -c /tmp/a.c
/tmp/a.c:6:10: error: use of undeclared identifier 'true'; did you mean 'free'?
  while (true) { if (foo() == 42) break; }
         ^~~~
         free
/usr/include/stdlib.h:565:13: note: 'free' declared here
extern void free (void *__ptr) __THROW;
            ^
1 error generated.


The "did you mean 'free'" hint is amusing, but it would be more helpful if
clang suggested including stdbool.h here, like it does with many standard
library functions.

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