[yocto] meta-mingw: unable to run executables on Windows

[Samuli Piippo]

On Thu, 15 Nov 2018 at 07:01, Khem Raj <raj.khem at gmail.com> wrote:
>
> On Wed, Nov 14, 2018 at 8:08 PM Joshua Watt <jpewhacker at gmail.com> wrote:
> >
> > On Wed, Nov 14, 2018 at 8:41 PM Mark Hatle <mark.hatle at windriver.com> wrote:
> > >
> > > On 11/14/18 9:54 AM, Mark Hatle wrote:
> > > > On 11/13/18 3:56 AM, Samuli Piippo wrote:
> > > >> Hi,
> > > >>
> > > >> I've just upgraded poky and meta-mingw layers from sumo to thud and as a result
> > > >> a lot of the executables in the toolchain no longer run correctly on Windows.
> > > >
> > > > Which version of windows?
> > > >
> > > >> I've built meta-toolchain for SDKMACHINE=x86_64-mingw32. From that, gcc/g++ work
> > > >> fine on Windows 10, but ar, as, objdumb, and others hang for ~30 seconds and
> > > >> exit without any output.
> > > >>
> > > >> Has anyone else seen this?
> > > >
> > > > I've run a toolchain made on mingw after sumo, but before thud's release.  I'll
> > > > see if I can find a VM and give it a try later today.
> > >
> > > I'm running on Windows 7 for my testing (ya, I know old.. but it's what I got.)
> > >
> > > Can you try adding the following to your conf/local.conf: GCCPIE_mingw32 = ""
>
> this will be effective just for SDK and native versions I hope, but in
> cases if we
> have this override also applicable for target then this fix is not
> correct. We have
> to keep using it for target builds.
>
> > >
> > > I found that the SDK was not working properly here as well, but only binutils.
> > > The above seems to fix the issue.  (You do have to rebuild your SDK.)
> >
> > I also saw this issue on Windows 7, and your described fix corrected
> > it (Thanks!). On the plus side, the automated SDK testing that I'm
> > working on discovered it as well (e.g. the tests failed because of
> > it), which means that the tests are working and should help prevent
> > issues like this in the future once I get it merged.
> >

bisect finished last night and the winner was: commit
491082c56ce34f3fd644f8d4457ccd52af951087
poky.conf: Enable security flags+pie by defaultEnable security
flags+pie by default

Adding GCCPIE_mingw32 = "" fixes this also for Windows 10