Re: [Qemu-devel] Compilation error of coroutine-win32.c with gcc version 3.4.5 (mingw-vista special r3)

[Stefan Hajnoczi <stefanha@gmail.com>]

On Wed, Aug 17, 2011 at 6:20 PM, Blue Swirl <blauwirbel@gmail.com> wrote:
> On Tue, Aug 16, 2011 at 6:50 PM, Paolo Bonzini <pbonzini@redhat.com> wrote:
>> On 08/16/2011 05:45 AM, Stefan Hajnoczi wrote:
>>>
>>> Roy,
>>> This stack trace does not reveal much.
>>>
>>> Is there any MinGW gcc user that has successfully built and run
>>> qemu.git?
>>
>> I would be surprised if Stefan Weil hasn't.
>
> Builds and runs (under i386 chroot + Wine) here. It worked also in
> Windows the last time I tried (2010).
>
>>> Which version/architecture of Windows and which MinGW
>>> version?
>
> Debian:
> $ i586-mingw32msvc-gcc -v
> Using built-in specs.
> Target: i586-mingw32msvc
> Configured with:
> /build/buildd-gcc-mingw32_4.4.4-0.1+b1-amd64-aFhFbL/gcc-mingw32-4.4.4/build-tree/gcc-4.4.4/configure
> --build=x86_64-linux-gnu --prefix=/usr --includedir='/usr/include'
> --mandir='/usr/share/man' --infodir='/usr/share/info'
> --sysconfdir=/etc --localstatedir=/var
> --libexecdir='/usr/lib/gcc-mingw32' --disable-multilib
> --enable-threads --enable-sjlj-exceptions
> --enable-version-specific-runtime-libs --disable-shared
> --target=i586-mingw32msvc --enable-languages=c,c++,fortran :
> (reconfigured) /build/buildd-gcc-mingw32_4.4.4-0.1+b1-amd64-aFhFbL/gcc-mingw32-4.4.4/build-tree/gcc-4.4.4/configure
> --build=x86_64-linux-gnu --prefix=/usr --includedir='/usr/include'
> --mandir='/usr/share/man' --infodir='/usr/share/info'
> --sysconfdir=/etc --localstatedir=/var
> --libexecdir='/usr/lib/gcc-mingw32' --disable-multilib
> --enable-threads --enable-sjlj-exceptions
> --enable-version-specific-runtime-libs --disable-shared
> --target=i586-mingw32msvc --enable-languages=c,c++,fortran
> Thread model: win32
> gcc version 4.4.4 (GCC)
>
> Compiled myself:
> $ i686-mingw32msvc-gcc -v
> Using built-in specs.
> COLLECT_GCC=i686-mingw32msvc-gcc
> COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/i686-mingw32msvc/4.6.0/lto-wrapper
> Target: i686-mingw32msvc
> Configured with: ../configure --target=i686-mingw32msvc
> --enable-targets=i686-mingw32msvc --disable-nls --disable-threads
> --enable-languages=c --disable-shared --disable-libssp
> --disable-multilib
> Thread model: single
> gcc version 4.6.0 20100925 (experimental) (GCC)
>
>> I'm trying to get rid of emutls, it is slow anyway and we'll likely want to
>> rely on TLS very liberally in the future.  If it fixes the bug, we can
>> backport it to stable too.
>
> I don't know about Win32 TLS support, but at least OpenBSD/sparc64
> gcc/ld/ld.so/libc do not support __thread. According to manual, TLS is
> not available everywhere:
> http://gcc.gnu.org/onlinedocs/gcc-4.6.1/gcc/Thread_002dLocal.html#Thread_002dLocal

Yeah, for OpenBSD we have the portable but slow GThread coroutine
implementation.

Stefan