On Tue, 19 Aug 2025 at 16:02, Marek Knápek <knapek.mar+...@gmail.com> wrote:
> You could always align your struct to particular alignment,
> even in C89. But that alignment must be alignment of one of
> already existing types. Typically such as void* or double.
>
>
> #include <assert.h>
> #include <stdint.h> /* uintptr_t might not exist here in C89 */
>
> union aligned_char_u
> {
> char m_char;
> void* m_pointer;
> };
> typedef union aligned_char_u aligned_char_t;
>
> struct my_char_s
> {
> aligned_char_t m_char;
> };
> typedef struct my_char_s my_char_t;
>
>
> int main(void)
> {
> my_char_t my_char;
>
> assert(((uintptr_t)(&my_char.m_char.m_char)) % (sizeof(void*)) == 0);
>
> my_char.m_char.m_char = '!';
> return my_char.m_char.m_char;
> }
>
>
>
>
Even with the existing workaround I think this would fit well in C89 and
replace TCC __attribute__ usage in this case with a portable syntax that
does not require macros or C89 workaround.
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