How to compile G’MIC lib with MSVC2015?

Torvald · June 5, 2017, 11:45am

How to compile G’MIC lib with MSVC2015 compiler? 64 and 32 -bit
I need lib for Qt project

David_Tschumperle · June 6, 2017, 5:52am

It’s been a while since I tried to compile G’MIC on MSVC, but last time it was OK.
I’ll probably give another try today, and tell you how it is going.

Torvald · June 6, 2017, 11:54am

Thanks! Will wait…

Torvald · June 8, 2017, 10:07am

I just need some guide. Sorry for newbie quastion.

Philemo · June 8, 2017, 10:50am

I have the same issue. Compiling the static lib generates something that really looks like an infinite loop in lc (May not be infinite, I gave up after 5 hours)
If it’s not possible, would it be possible to provide the libcgmicstatic.lib file for version 2.0? I could do with that and use the gmic_libc interface.

Torvald · June 8, 2017, 10:59am

infinite loop only when compiling static lib? Dynamic is ok?

Philemo · June 8, 2017, 11:02am

Didn’t try, but static or dynamic shouldn’t change that much at compilation level. Furthermore, for packaging reason, I prefer not to pack all dependencies.

Philemo · June 8, 2017, 11:05am

I forgot. I used cmake_gui to create the MSVC solution.

David_Tschumperle · June 8, 2017, 4:15pm

Hello. Yes, there have always been a lot of issues when trying to compile the libgmic with Microsoft Visual Studio.
Particularly, when the optimizations are enabled (so in Release mode), this takes forever to complete (several hours).
Don’t ask me why, I suspect this is a problem with the compiler itself

I haven’t made a lot of tests, so I can’t say much about that. What I did is compiling the libgmic in Debug mode, and without any dependencies activated, so something pretty useless at the end, but it was done mainly to see if there was compiler warnings or errors that I could fix.

Sorry for this non-answer by the way

Torvald · June 8, 2017, 4:36pm

So… it’s impossible? Make release lib on MSVC2015 x32? G’MIC 1.7.9

David_Tschumperle · June 9, 2017, 6:57am

I guess that the best way to use libgmic with MSVC is actually using the libcgmic .dll file, look at:

github.com

dtschump/gmic-community/blob/master/libcgmic/use_libcgmic.c

/*
 #
 #  File        : use_libcgmic.c
 #                ( C source file )
 #
 #  Description : Show how to call the C version of the G'MIC library from a C source code.
 #                (for a C++ API, see 'use_libgmic.cpp' instead)
 #
 #  Copyright   : Tobias Fleischer
 #                ( https://plus.google.com/u/0/b/117441237982283011318/+TobiasFleischer )
 #
 #  License     : CeCILL-B v1.0
 #                ( http://cecill.info/licences/Licence_CeCILL-B_V1-en.html )
 #
 #  This software is governed either by the CeCILL-B license
 #  under French law and abiding by the rules of distribution of free software.
 #  You can  use, modify and or redistribute the software under the terms of
 #  the CeCILL-B licenses as circulated by CEA, CNRS and INRIA
 #  at the following URL: "http://cecill.info".
 #

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The .dll is available as a pre-compiled library file, which makes it easy to use on MSVC (as shown in the link below).

Philemo · June 9, 2017, 7:22am

I agree and it works mostly like a charm for version 1.7.
I have some issues though.Inplace mode generates an error and freeing external images plays some tricks with the stack when several images are to be freed.

I wanted to try with the latest version, but the distribution for version 2.0 lacks the .lib associated with the .dll.

David_Tschumperle · June 9, 2017, 7:34am

Ah that is interesting. I guess @Tobias_Fleischer might be interested by any feedback on the use of its libcgmic.
He has told me once how to create the .lib file associated to a .dll, but I cannot remember the command.
If you have any idea I could add the .lib file to the newest Windows archive ASAP.

Tobias_Fleischer · June 9, 2017, 8:34am

If it is not included with the download, then you first have to create a .def file with the exported functions.
Then create a .lib stub file from that .def file.
Here the process is explained in detail:
https://adrianhenke.wordpress.com/2008/12/05/create-lib-file-from-dll/

Tobias_Fleischer · June 9, 2017, 8:40am

Oh, and it is a good idea to add the parameter /MACHINE:x64 to the “lib” call to generate 64bit libs.

Here is how I create my 64bit libs:

lib /def:libcgmic.def /out:libcgmic.lib /machine:x64
lib /def:libcgmicstatic.def /out:libcgmicstatic.lib /machine:x64

Philemo · June 9, 2017, 11:52am

Great. Thank you so much.
It works perfectly.

One more question if I may. Using libgmic, how can I have access to the function init_rc or change the path to where the cluts are stored ? (need to access cluts without internet connection).

Tobias_Fleischer · June 9, 2017, 12:12pm

Interesting question about init_rc
The libcgmic approach works mostly the same as the command line application, therefore I have to ask: how is it solved there?
@David_Tschumperle: is it currently possivble to enter the path to the cluts for a command on the GMIC CLI application?

Tobias_Fleischer · June 9, 2017, 12:15pm

@Philemo: if you could give me more info or a little sample application using libcgmic that shows the bugs you described (inplace sometimes not working or porblems when freeing external images), I will try to track them down and fix them.

David_Tschumperle · June 9, 2017, 1:42pm

Yes, by setting the environment variable %GMIC_PATH% to a valid folder name.

Tobias_Fleischer · June 9, 2017, 2:33pm

Then I think this should also work for @Philemo 's requirements