| Issue |
185400
|
| Summary |
[clang] [diagnostics] Wrong -Wimplicit-int-enum-cast warning
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
Pheeck
|
Compile this C code snippet with trunk Clang using -Wc++-compat
```
void free(void *p);
typedef enum
{
REG_EBRACE,
REG_BADBR,
} reg_errcode_t;
# define FREE_STACK_RETURN(value) \
return (free (compile_stack.stack), value)
reg_errcode_t
regex_compile (void *bufp)
{
struct { int *stack; int b;} compile_stack;
FREE_STACK_RETURN (bufp ? REG_EBRACE : REG_BADBR);
}
```
Clang will complain
```
<source>:16:22: warning: implicit conversion from 'int' to enumeration type 'reg_errcode_t' is invalid in C++ [-Wimplicit-int-enum-cast]
16 | FREE_STACK_RETURN (bufp ? REG_EBRACE : REG_BADBR);
| ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<source>:10:39: note: expanded from macro 'FREE_STACK_RETURN'
10 | return (free (compile_stack.stack), value)
| ~ ^~~~~
```
But this warning doesn't make sense. As far as I can tell, no int is involved. No implicit conversion from int should be happening. GCC doesn't generate any similar warning:
https://godbolt.org/z/WdMxbYjTz
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