Are you talking about gcc -Wignored-qualifiers? It seems like such
warning is only emitted where the function is *defined*, not where the
function is *called*. Example:
---
const int f(void) { return 1; }
int main() { return f(); }
---
Output:
---
$ gcc -Wextra y.c -o y
y.c:1:1: warning: type qualifiers ignored on function return type
[-Wignored-qualifiers]
1 | const int f(void) { return 1; }
| ^~~~~
---
I'm only able to get a compile *error* when a macro is used as a
l-value. Example:
---
struct Point { int x; int y; };
#define POINT_X(p) ((int)p.x)
int main()
{
struct Point p = {1, 2};
int x = POINT_X(p); // r-value ok
POINT_X(p) = 1; // l-value ERROR
return 0;
}
---
With "#define POINT_X(p) (p.x)", the macro can be used as l-value and r-value.
Victor
On Wed, Dec 8, 2021 at 1:43 AM Greg Ewing <greg.ew...@canterbury.ac.nz> wrote:
>
> On 8/12/21 4:36 am, Antoine Pitrou wrote:
> > Is there a way to emit a compilation warning when those macros are used
> > as l-values? Even if only enabled on some compilers.
>
> Maybe the macro could be written so that it expands to something
> with a cast around it? I think gcc has an option for warning about
> casts used as l-values.
>
> --
> Greg
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