| I have made some progress in understanding and fixing problems with running Csound on Windows, e.g. as reported by Art Hunkins.
First, I have backed out the use of Visual C++ to build all third-party libraries, even though I had to jump through some hoops to configure and build them, and even make some SConstruct build files for some of the libraries that wouldn't ./configure; make or didn't have their own SConstruct. There is therefore no more dependency on the Microsoft runtime library.
Second, the MinGW compiler I am using, gcc version 4.2.1-dw2 (mingw32-2), seems to have a problem with relocating shared libraries. This is what causes Csound to fail to load some plugins and opcodes. This is from the Nabble MinGW forum:
The problem is that DLLs generated by MingW GCC (with -shared) are not
correctly relocatable, even though they contain relocation information.
LoadLibrary() returns ERROR_NOACCESS if it is forced to relocate the DLL
and a backtrace shows a blind jump into bad memory from
__gcc_register_frame.
I found that the problem was not as serious with command-line Csound as it is with csound5gui or CsoundVSTShell, and I was able to fix up the fluidOpcodes.dll library by linking it with a static FluidSynth library, thus avoiding one potential relocation. However, this kind of problem can manifest itself differently on different versions of Windows and on different computers with different amounts of memory, etc. For me, there is still a problem with stdutil.dll and HrtfX.dll.
The relocation can be resolved by reverting to gcc version 3.4.5, but unfortunately gcc version 4.2.1-dw2 is quite a bit faster running Csound!
I am going to see if I can build and run Csound with the setjump-longjump version of MinGW (gcc version 4.2.1-sjlj), and look for workarounds. If that doesn't work, I'm not really sure what to do -- probably revert to an earlier version of gcc.
Regards,
Mike
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