On Sun, Jan 10, 2021 at 2:05 PM Mikael Pettersson via Gcc-patches
<gcc-patches@gcc.gnu.org> wrote:
>
> On Sun, Jan 10, 2021 at 11:57 AM Arnaud Charlet <char...@adacore.com> wrote:
> >
> > > This fixes a compilation error preventing bootstrap with Ada on
> > > x86_64-pc-cygwin. See PR bootstrap/94918 for details.
> > >
> > > Compared to the initial patch sent in May 2020, this v2 patch places
> > > the fix in Ada's raise-gcc.c instead of the shared unwind-generic.h,
> > > which should hopefully simplify getting it applied.
> >
> > Not sure why. Applying it there looks incomplete and kludgy, don't you
> > agree?
>
> Ok, then here's v3 which places the fix in unwind-generic.h. The fix
> matches what Ada's mingw32.h does.
>
> Tested by bootstrapping this and the preliminary workaround for
> PR98590 on x86_64-pc-cygwin.
>
> Ok for master and branches?
I wonder why we include <windows.h> from this file at all,
and why it is not included from {t,}system.h instead which
is where system header specific fixups should be made
(and this one could be avoided because system headers
are included _before_ poisoning anything).
The include was added by Tristan, well - probably just merged by him.
Eric?
> libgcc/
>
> 2021-01-10 Mikael Pettersson <mikpeli...@gmail.com>
>
> PR bootstrap/94918
> * unwind-generic.h (__SEH__): Prevent windows.h from including
> x86intrin.h or emmintrin.h on Cygwin64.
>
> --- gcc-11-20210103/libgcc/unwind-generic.h.~1~ 2021-01-03
> 23:32:20.000000000 +0100
> +++ gcc-11-20210103/libgcc/unwind-generic.h 2021-01-09
> 14:51:16.262378715 +0100
> @@ -30,6 +30,12 @@
>
> #if defined (__SEH__) && !defined (__USING_SJLJ_EXCEPTIONS__)
> /* Only for _GCC_specific_handler. */
> +#if defined (__CYGWIN__) && !defined (__CYGWIN32__) && !defined (IN_RTS)
> +/* Note: windows.h on cygwin-64 includes x86intrin.h which uses malloc.
> + That fails to compile, if malloc is poisoned, i.e. if !IN_RTS. */
> +#define _X86INTRIN_H_INCLUDED
> +#define _EMMINTRIN_H_INCLUDED
> +#endif
> #include <windows.h>
> #endif
