Complete build options for Pthread API about tesseract HOT 10 CLOSED

@stweil
Do you think we need it?

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Using AX_PTHREAD would introduce a new dependency, because it is part of the GNU Autoconf Archive. On all of my build hosts, the Debian package autoconf-archive would have to be installed.

I only found a configure.ac for powertop which uses AX_PTHREAD, so it seems to be rarely used.

If we have multi-threaded code based on pthread, it is necessary to use the right compiler and linker options. Those options can be set by AX_PTHREAD, but also by software packages using pkg-config.

@elfring, did you notice missing options for pthread support in some Tesseract configurations?

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If we have multi-threaded code based on pthread, it is necessary to use the right compiler and linker options.

• Which script should determine appropriate parameters for your current build specification?
• Would you like to bundle it with your build system?

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I don't use any private scripts for compiler or linker options in Tesseract builds.

As far as I see, Tesseract only uses multi-threading for the viewer (only built for Windows, see viewer/svutil.cpp and for builds with OpenCL (which is disabled by default). So I assume that there is currently a problem with missing multi-threading compiler / linker options for these two configurations. Is that correct? Personally I must admit that I used neither of both configurations up to now.

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Would you like to improve the build situation generally for the mentioned software areas?

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Yes, of course, but I won't be able to contribute much during the next few weeks due to other activities.

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@elfring
I can't guarantee that there will be someone available to review these build system changes. I was hoping that @stweil could do it, but he has other priorities right now...

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Also note that we want to support cygwin and mingw.

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And we need to support Visual Studio ;-)

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Closing as it seems no progress for 2 years. Feel free to send PR with code/build system improvement.

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