Re: Compiling ATLAS with MinGW

[Michael Goffioul]

On Sun, Feb 19, 2012 at 12:03 AM, Michael Goffioul
<address@hidden> wrote:
> On Sat, Feb 18, 2012 at 11:08 PM, Tatsuro MATSUOKA
> <address@hidden> wrote:
>> Hello
>>
>> I have complied the ATLAS self-build GCC on Cygwin compiler (gcc-4.5.3).
>> From the libatlats.a and liff77blas.a, I have create libblas.dll.a and 
>> libblas.dll using MinGW GCC as linker.
>>
>> This ATLAS can be linked with Octave on MinGW.
>>
>> The reason why I use self build GCC on cygwin, I have not create 
>> libblas.dll.a and libblas.dll with MinGW linker from libatlats.a and 
>> libff77blas.a built with the GCC bundled with Cygwin.
>
> Thanks Tatsuro. So you're basically doing the same as me. The reason
> I'm asking is that I've been trying to recompile ATLAS with
> multi-thread support, but went into problems. The multi-threaded ATLAS
> version is compiled against pthread library. However when applying the
> same method as above, you're using cygwin-GCC to compile ATLAS; hence
> you're using the cygwin version of pthread headers. At link stage,
> you're using MinGW-GCC and link against the MinGW version of pthread
> library (which is basically this one:
> http://sourceware.org/pthreads-win32/).
>
> But the catch is that the pthread types in the cywin version and MinGW
> version are not the same, especially they don't have the same size. In
> other words: sizeof(pthread_t) in cygwin is not the same as
> sizeof(pthread_t) in MinGW. And you end up with stack corruption.
>
> I tried to compile ATLAS with the mingw-xxx compilers that are
> available in cygwin, but teh build process stops almost immediately
> with an error (ERROR 435 DURING Stage 1 install).

Actually, it seems to work fine when I keep the XCC compiler to be
cygwin-GCC. I'll give that a shot when I get some time.

Michael.