Am Mon, 25 Mar 2013 19:26:10 +0000 schrieb Iain Buclaw <ibuc...@ubuntu.com>:
> On 25 March 2013 18:36, Johannes Pfau <nos...@example.com> wrote: > > > In runnable/test42.d test7290 checks if a scope delegate is really > > allocated on the stack. To verify this it obtains the EBP pointer > > and compares that to the delegates .ptr. > > > > The problem is that as soon as we enable optimization gcc no > > longer adjusts the EBP pointer when calling the helper functions and > > the test fails... > > > > This test seems to be very fragile in general so what should we do > > about this? > > > > > > BTW: I introduced a small typo in test7290 when porting to GCC asm: > > The test in the main test7290 function should check "assert(dg.ptr > > <= p);", not "assert(p < dg.ptr);" > > > > > 1. Revert your typo. > > 2. Raise with a thread in dmd-internals about it. -O2 in GDC triggers > -fomit-frame-pointer. I'm 90% certain that Walter will say that any > function with assembly inside requires that a frame pointer must > always be present (except in naked function), but that is absolute > rubbish. For x86_64 (at least), the ABI encourages the absence of a > frame pointer. > > > Regards 2 doesn't sound very promising though. We could just move that test to another file and make sure it's compiled with -fno-inline and fno-omit-frame-pointer. Even if dmd asm may require the frame pointer that needn't be true for gcc asm. BTW: Do we allow backports of specific frontend fixes into gdc? I'd like to merge the fix for the final methods in interfaces problem.
