[PATCH][testsuite] Fix pr25109.sh on riscv64

[Mark Wielaard]

Hi Tom,

On Fri, Feb 26, 2021 at 11:14:23AM +0100, Tom de Vries wrote:
> On riscv64, I run into:
> ...
> cc main.c no-multifile-prop-dw.S -o no-multifile-prop
> no-multifile-prop-dw.S: Assembler messages:
> no-multifile-prop-dw.S:25: Error: non-constant .uleb128 is not supported
> make: *** [Makefile:99: no-multifile-prop] Error 1
> ...
> 
> Fix this by allowing to fail to build the test-case, and marking it as
> unsupported.
> 
> Any comments?

If it doesn't even build then there is not much else we can do than
skip it.  So I would push this.

But this is a little surprising.
The construct seems like it is represented by a known constant at compile time:

        .uleb128        .Lexpr_end4 - .Lexpr_start3/* expression */ 
.Lexpr_start3: 
        .byte        0xf2               /* DW_OP_GNU_implicit_pointer */ 
        .4byte        .Llabel2 
        .sleb128        0 
.Lexpr_end4: 

There isn't anything between the two labels that can have a variable
size.  So it might be a good idea to file a bug report against
binutils as for not allowing this on riscv64.

Cheers,

Mark