According to: http://msdn.microsoft.com/en-us/library/windows/desktop/ms682653(v=vs.85).aspx
the total size of the environment is 32kByte. This has hit me several times in GNU-make when CreateProcess() triggers the mysterious error 87 (ERROR_INVALID_PARAMETER). Like in a very simple rule that involves 'echo': process_begin: CreateProcess(g:\MingW32\msys\bin\echo.exe, echo "Generating ...", ...) failed. make (e=87): Parameteren er feil << Invalid parameter. I've added a patch to arr2envblk() that checks the Win OS-version and prints a warningif 'size_needed' exceeds 32 kByte.
Googling for this error, returns approx 50.000 hits. So I think this warning is warranted.On Windows Vista and Windows Server 2008 (or above), MS has luckily removed that limit. The command-line length has similar limit on Win-XP and below. But that error is probably easier to spot.
I'm not sure if the warning should be printed only when "--debug=jobs" is in effect or always. But only once. Your choice. Patch attached. --gv
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