Re: Compiling pthreads with MXE/MinGW

[Michael Goffioul]

On Tue, Jun 25, 2013 at 9:06 PM, Michael Goffioul <address@hidden> wrote:

Hi,

After looking at how pthreads is compiled under MXE/MinGW, I'm starting to doubt the generated DLL is actually valid. The way it works is that it compiles a static version of libpthreads.a, then it generates the DLL using the script make-shared-from-static.

The static library is compiled using the target GC-static, and if you look into [1], you can see that it defines PTW32_STATIC_LIB. Now it you look into [2], you can see that the whole body of dll.c is ignored. In other words, I think the DLL initialization routine (DllMain) is missing in the generated DLL; hence the pthreads DLL is invalid.

Michael.

[1] ftp://sourceware.org/pub/pthreads-win32/sources/pthreads-w32-2-9-1-release/GNUmakefile

[2] ftp://sourceware.org/pub/pthreads-win32/sources/pthreads-w32-2-9-1-release/dll.c

Initially, I looked into that, because pthreads is marked as a dependency for fltk. But this is useless, as fltk configure script explicitly ignores pthread for fltk, and use Win32 threads instead.

Michael.