Re: [avr-gcc-list] builtins-error.c test fails for avr

[Georg-Johann Lay]

Am 04/21/2015 um 09:17 AM schrieb Sivanupandi, Pitchumani:
> Hi,
>
> Test gcc.target/avr/torture/builtins-error.c is failed in gcc-4.9 and trunk for 
> -Os -flto options.
> This test expects error for compile time constant. Option flto delays the 
> builtin expand
> (to link time??) and there is no error. Can this test be skipped for above 
> option?
>
> If -ffat-lto-objects option used then avr-gcc gives the error.
>
> Regards,
> Pitchumani

Without fat LTO objects, the compiler just puts gimple IR into the objects, 
there is no asm code.  Built-in functions are represented by their decls as 
provided by targetm.builtin_decl().  This means there is no expansion of tree 
to rtl.
That expansion is as late as possible (in principle it could even be in some 
rtl pass; the assumption is that if the respective value has not been resolved 
to integer_cst then the same applies to later passes.

A fix could be to add a trivial main and run the program, maybe also add used 
attributes to the functions.

Or simply adding -ffat-lto-objects or switching from do-assemble to do-link.

Johann