On Saturday 24 December 2022 03:17:57 LIU Hao wrote:
> 在 2022-12-24 01:43, Pali Rohár 写道:
> > Ou right. They would also require __attribute__((used)) for LTO builds.
> > I just tested simple single process/thread console applications and they
> > worked.
> >
> > Do you have any test case application which would be affected if these
> > symbols are eliminated?
>
> Does this program still have an output, with LTO?
>
> ```
> typedef void atexit_func(void*);
> extern int __cxa_thread_atexit(atexit_func*, void*, void*);
> extern void* __dso_handle;
> extern int puts(const char*);
>
> int
> main(void)
> {
> /* print a string upon the current thread's exit. */
> __cxa_thread_atexit((atexit_func*) puts, "test thread atexit",
> &__dso_handle);
> }
> ```
>
> This attempts to call the `__cxa_thread_atexit` from mingw-w64 CRT instead
> of the one provided by libgcc. If TLS facilities are optimized out then
> there will be no output.
I just quickly tested it only in wine. Without LTO it prints "ł$"
(really strange, looks like some memory problem, maybe in wine?).
And with LTO it prints nothing. When I added __attribute__((used)) for
those 3 symbols then it started printing "ő<".
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