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Problem with the linking #33

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OM92 opened this issue Jan 10, 2017 · 13 comments · May be fixed by #79
Open

Problem with the linking #33

OM92 opened this issue Jan 10, 2017 · 13 comments · May be fixed by #79

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@OM92
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OM92 commented Jan 10, 2017

Hello,
first of all, I want to say a big thank you to danfis for the library.
I am completely new to the library and want to start to use it. I already installed it and I am trying to compile the example GJK - Intersection Test. However, I am encountering a linking problem with the lines:
CCD_INIT(&ccd); // initialize ccd_t struct
int intersect = ccdGJKIntersect(obj1, obj2, &ccd);
in the main function and the compiler is giving me the following error messages:
undefined reference to _imp__ccdFirstDirDefault' undefined reference to _imp__ccdGJKIntersect'

I did add the library libccd in my compiler so I don't understand why the compiler can't find those functions.
My questions may be trivial and maybe it is not right place to post it, but I couldn't find any help anywhere else.

I am using windows 7 and Mingw
Any help would be much appreciated.
Thank you in advance
@JXLee33
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JXLee33 commented Mar 30, 2018

I have the same problem. You can try to add extern int ccdGJKIntersect(const void *obj1, const void *obj2, const ccd_t *ccd) before main() function. And if you find red line under CCD_INIT,you can try this https://github.com/danfis/libccd/pull/40/files

@vekkuli
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vekkuli commented Oct 2, 2018 •
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I had similar linking issues. I had set the library to be built static in cmake but it seemed like the CCD_EXPORT definition wasn't right. Is the CCD_STATIC_DEFINE defined properly? Anyway, I was able to resolve the issue by overriding the ccd_export.h with

#ifndef CCD_EXPORT_H
#define CCD_EXPORT_H

#define CCD_EXPORT

#endif

@Mikez2015
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Have same problem - fatal error LNK1120.
I tried to do as advised vekkuli, but it did not help.

@Mikez2015
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Mikez2015 commented Feb 18, 2020 •
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I have the same problem. You can try to add extern int ccdGJKIntersect(const void *obj1, const void *obj2, const ccd_t *ccd) before main() function.

warning C4273: ccdGJKIntersect:

@JXLee33
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JXLee33 commented Feb 18, 2020 via email

@Mikez2015
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Mikez2015 commented Feb 18, 2020 •
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Warning means you can run it but you still have some potential problem. In most situation, it is just a useless hint. It depends on your compiler.

But I still get the error LNK1120.
I tried different tips, but nothing helps.

@JXLee33
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JXLee33 commented Feb 18, 2020 via email

@Mikez2015
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Mikez2015 commented Feb 18, 2020 •
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Please tell me your compiler, if you use visual stdio2015, maybe I could give you my test program.

Latest VS 2019, x64

@JXLee33
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JXLee33 commented Feb 18, 2020 via email

@Mikez2015
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This is a test program for cube, open libccdtest.sln, maybe it works.

Where? I do not see the link.

@JXLee33
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JXLee33 commented Feb 18, 2020 via email

@Mikez2015
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At first， I used the link as I said in the comment.But then I found that it is more convenient to put some files directly into the project.I couldn't find the original version.Sorry.😐
…
---Original--- From: "Mikez2015"<notifications@github.com> Date: Tue, Feb 18, 2020 19:17 PM To: "danfis/libccd"<libccd@noreply.github.com>; Cc: "Comment"<comment@noreply.github.com>;"JXLee33"<1072324172@qq.com>; Subject: Re: [danfis/libccd] Problem with the linking (#33) This is a test program for cube, open libccdtest.sln, maybe it works. Where? I do not see the link. — You are receiving this because you commented. Reply to this email directly, view it on GitHub, or unsubscribe.

No problems, thx.

I found sulution:
Add "#define CCD_STATIC_DEFINE" to "config.h" and copy to includes.
It's work for me.

@SpaceIm
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SpaceIm commented Feb 23, 2020 •
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I've solved linkage errors with msvc like this.
If static, CCD_STATIC_DEFINE has to be defined:

  • At libccd compilation time (otherwise it leads to a lot of C4273 warnings "inconsistent dll linkage", and after that it may fail to link into an executable or shared lib).
  • When consuming static libccd.

CMakeLists.txt of libccd could be easily fixed by defining CCD_STATIC_DEFINE not only when CCD_HIDE_ALL_SYMBOLS is ON, but also when BUILD_SHARED_LIBS is OFF.

@traversaro traversaro linked a pull request Jun 20, 2023 that will close this issue
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Define and propagate CCD_STATIC_DEFINE if the library is compiled as static traversaro/libccd
5 participants
@vekkuli @Mikez2015 @OM92 @SpaceIm @JXLee33