Zig Version

0.15.0-dev.442+b9b606969

Steps to Reproduce and Observed Behavior

Zig currently supports having inline assembly inputs as clobbers. However, both clang and gcc do not, so using -ofmt=c produce c code that cannot compile with either.

pub fn main() void {
    const in: usize = 10;
    asm volatile ("" :: [in] "{rax}" (in) : "rax");
}

is valid zig, but produces

// ...
static void main_main__1001(void) {
    /* file:10:2 */
    /* dbg_var_val:in */
    /* file:11:2 */
    register uintptr_t const t0 __asm("rax") = (uintptr_t)10ul;
    __asm volatile("":: [in]"r"(t0): "rax");
    return;
}
// ...

which is not valid c (for gcc and clang anyway).

This make the feature of having inputs as clobbers impossible to use in the std since tests seems to also be run using -ofmt=c.

Expected Behavior

The C backend should produce working c code whenever inline assembly inputs are also in the clobber list.