This snippet
```
#include<stdio.h>
int main(int argc, char* argv[])
{
switch(argc)
{
case 3:
puts(argv[2]);
__attribute__((fallthrough));
case 2:
puts(argv[1]);
__attribute__((__fallthrough__));
case 1:
puts(argv[0]);
/* fall through */
default:
puts("done");
}
}
```
if compiled with
```
$ llvm-gcc --version
Apple LLVM version 10.0.0 (clang-1000.10.44.4)
Target: x86_64-apple-darwin17.7.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
```
yields
```
nicola@Quark:freetype $ clang main.c
main.c:9:9: warning: declaration does not declare anything
[-Wmissing-declarations]
__attribute__((fallthrough));
^
main.c:12:9: warning: declaration does not declare anything
[-Wmissing-declarations]
__attribute__((__fallthrough__));
^
2 warnings generated.
```
In `lib/dfa.c` I see
```
...
# elif (__GNUC__ >= 7) || (__clang_major__ >= 10)
# define FALLTHROUGH __attribute__ ((__fallthrough__))
...
```
I now wonder whether it would be better to have a special case for
Apple LLVM to avoid this warning.
Werner
