On Fri, Jun 19, 2015 at 06:22:12PM +0200, Marek Polacek wrote:
> Using -fsanitize=undefined -fsanitize-undefined-trap-on-error when both
> compiling and linking results in libubsan.so in DT_NEEDED of the final
> executable. That's inconvenient since the latter flag ensures that
> __builtin_trap is used instead of libubsan routines thus the libubsan
> library shouldn't be needed at all.
>
> Jakub suggested adding the Driver property and that seems to work.
>
> Bootstrapped/regtested on x86_64-linux, ok for trunk?
>
> 2015-06-19 Marek Polacek <pola...@redhat.com>
>
> * common.opt (fsanitize-undefined-trap-on-error): Add Driver.
Ok for trunk and 5.2.
> diff --git gcc/common.opt gcc/common.opt
> index 32b416a..dd49ae3 100644
> --- gcc/common.opt
> +++ gcc/common.opt
> @@ -918,7 +918,7 @@ Common Report
> This switch is deprecated; use -fsanitize-recover= instead
>
> fsanitize-undefined-trap-on-error
> -Common Report Var(flag_sanitize_undefined_trap_on_error) Init(0)
> +Common Driver Report Var(flag_sanitize_undefined_trap_on_error) Init(0)
> Use trap instead of a library function for undefined behavior sanitization
>
> fasynchronous-unwind-tables
Jakub
