CMake error (FindLIBIGL)

[paulelian-tabarant]

Hello,

I've been using libigl for a few months now (thanks for the tools by the way), and I started my project from this example while hosting it on a Github repo. However, in any project I start from this example now, I get the following error when executing "cmake .." from a "debug" repository inside my project :

CMake Error at cmake/FindLIBIGL.cmake:36 (include):
include could not find load file:

libigl

Call Stack (most recent call first):
CMakeLists.txt:10 (find_package)

I saw from an previous post by Alec Jacobson that it might be due to inappropriately set environment variables, but I do not know anything about how to fix it. My "libigl" directory is at the same location as my project directory. Do you have any idea ?

Thank you very much,

Paul-Elian

[BruegelN]

When generating a project file using cmake you could specify the path to your libigl include dir.
i.e.

cd libigl-example-project
mkdir build
cd build
cmake .. -DLIBIGL_INCLUDE_DIR="/path/to/custom/libigl/include"

or using CMake GUI you could set the value of LIBIGL_INCLUDE_DIR to the include folder of your libigl directory and regenerate the project.

As you can see here https://github.com/libigl/libigl-example-project/blob/master/cmake/FindLIBIGL.cmake#L11-L15 CMake checks for a few environment variables. Have set one of them?

[paulelian-tabarant]

Specifying the include path worked, thank you. I don't remember having set any of these variables before, could my problem be related to having one of these variables incorrectly set ?

[BruegelN]

Actually I don't think your problem is related.
But I still don't get your setting.
Did you do something like this:

git clone https://github.com/libigl/libigl-example-project.git
cd libigl-example-project
git clone https://github.com/libigl/libigl.git

such that your libigl folder is inside the example project?

E.g. for $ tree -L 2 libigl-example-project/ you get a similar output:
libigl-example-project/
├── build
│   ├── CMakeCache.txt
│   ├── CMakeFiles
│   ├── cmake_install.cmake
│   ├── eigen-build
│   ├── example_bin
│   ├── glad
│   ├── glad-build
│   ├── glfw
│   ├── glfw-build
│   ├── libigl-config.cmake
│   ├── libigl-export.cmake
│   └── Makefile
├── cmake
│   └── FindLIBIGL.cmake
├── CMakeLists.txt
├── libigl
│   ├── cmake
│   ├── CMakeLists.txt
│   ├── external
│   ├── include
│   ├── LICENSE.GPL
│   ├── LICENSE.MPL2
│   ├── python
│   ├── README.md
│   ├── tests
│   └── tutorial
├── LICENSE
├── main.cpp
└── README.md

This is one of the locations where libigl is searched: https://github.com/libigl/libigl-example-project/blob/master/cmake/FindLIBIGL.cmake#L11-L15 and it works for me both on macOS and Ubuntu.
That's why I'm a little confused.

Glad that you've got it working already :)

[paulelian-tabarant]

Yes I've also tried to put the libigl library files right inside my project, but I still get the same CMake Error mentioned above in this thread... That's very curious because it was not the case a few weeks ago. I cannot figure out any change of configuration in my system since the last time I've been working on it.

Thanks for the tip anyway! ;)

I have to say it is kind of crazy to ask a user to copy a 15+GB thing to a fixed position when it has been installed somewhere else, and furthermore to specify LIBIGL_INCLUDE_DIR when this path is obvious after copying, for an example to be able to build. Good news is that the example finally works for me, but I hope FindLIBIGL.cmake could be more adaptive when doing its job.

[cynthiaxw]

Hi,

I've been struggling with the same issue for hours. I'm using the same FindLIBIGL.cmake file as well, and have tried the solutions mentioned above, but none of them worked. I also tried to set the environment variables (LIBIGL_DIR to the libigl directory) and it's still not working. Do you have any thoughts?

Xi

[BruegelN]

@zhfsu why is your libigl folder so large? Do you have many different build folder (e.g. for different configurations)? Then no need to copy them.
Sorry if I was a but unclear FindLIBIGL.cmake does look in a few place by default see:
https://github.com/libigl/libigl-example-project/blob/master/cmake/FindLIBIGL.cmake#L17-L26
Or if you want to use your version of libigl you can always specify LIBIGL_INCLUDE_DIR. See my answer above: #23 (comment)
I'm sorry I still don't get your issue @zhfsu.

@cynthiaxw what error message do you get?
Does your error message look like this:

CMake Error at /usr/share/cmake-3.13/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
  

  libigl not found --- You can download it using:

  	git clone --recursive https://github.com/libigl/libigl.git
  /home/nico/test/libigl-example-project/../libigl (missing:
  LIBIGL_INCLUDE_DIR)
Call Stack (most recent call first):
  /usr/share/cmake-3.13/Modules/FindPackageHandleStandardArgs.cmake:378 (_FPHSA_FAILURE_MESSAGE)
  cmake/FindLIBIGL.cmake:30 (find_package_handle_standard_args)
  CMakeLists.txt:10 (find_package)

Have you tried to clone libigl inside libigl-example-project or one level above(cd .. the clone)?

[cynthiaxw]

Hi Nico, Thanks for your email. My error looks exactly the same as this. And I also tried cloning into the parent directory and using environment variables, none of them worked. They all reported the same message. One thing is that I'm using libigl as a dependency for another library (gptoolbox) rather than the ligigl-example-project. I'll try the example project and see if it works. Thank you :) Xi

…

On Mon, 5 Aug 2019 at 02:57, Nico ***@***.***> wrote: @zhfsu <https://github.com/zhfsu> why is your libigl folder so large? Do you have many different build folder (e.g. for different configurations)? Then no need to copy them. So if I was a but unclear FindLIBIGL.cmake does lock in a few place by default see: https://github.com/libigl/libigl-example-project/blob/master/cmake/FindLIBIGL.cmake#L17-L26 Or if you want to use your version of libigl you can always specify LIBIGL_INCLUDE_DIR. See my answer above: #23 (comment) <#23 (comment)> I'm sorry I still don't get your issue @zhfsu <https://github.com/zhfsu>. @cynthiaxw <https://github.com/cynthiaxw> what error message do you get? Does your error message look like this: CMake Error at /usr/share/cmake-3.13/Modules/FindPackageHandleStandardArgs.cmake:137 (message): libigl not found --- You can download it using: git clone --recursive https://github.com/libigl/libigl.git /home/nico/test/libigl-example-project/../libigl (missing: LIBIGL_INCLUDE_DIR) Call Stack (most recent call first): /usr/share/cmake-3.13/Modules/FindPackageHandleStandardArgs.cmake:378 (_FPHSA_FAILURE_MESSAGE) cmake/FindLIBIGL.cmake:30 (find_package_handle_standard_args) CMakeLists.txt:10 (find_package) Have you tried to clone libigl inside libigl-example-project or one level above(cd .. the clone)? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#23?email_source=notifications&email_token=AGT37JVYOETP2WDDJY6Y6T3QC7TQTA5CNFSM4HMQPJDKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD3RFAWI#issuecomment-518148185>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AGT37JWMK4KE7DOWKCP6E2DQC7TQTANCNFSM4HMQPJDA> .

[cynthiaxw]

Hi Nico, Sorry for the spam. The error that you have sent is what I experienced before cloning the libigl repository. After I cloned it, the error changed to : ----------------------------------------------------------------------------- CMake Error at cmake/FindLIBIGL.cmake:36 (include): include could not find load file: libigl Call Stack (most recent call first): CMakeLists.txt:37 (find_package) ----------------------------------------------------------------------------- I tested the libigl-example-project and it works well, but it's still not working in the gptoolbox library (as is shown in the above error message). Xi

…

On Tue, 6 Aug 2019 at 14:58, Xi Wang ***@***.***> wrote: Hi Nico, Thanks for your email. My error looks exactly the same as this. And I also tried cloning into the parent directory and using environment variables, none of them worked. They all reported the same message. One thing is that I'm using libigl as a dependency for another library (gptoolbox) rather than the ligigl-example-project. I'll try the example project and see if it works. Thank you :) Xi On Mon, 5 Aug 2019 at 02:57, Nico ***@***.***> wrote: > @zhfsu <https://github.com/zhfsu> why is your libigl folder so large? Do > you have many different build folder (e.g. for different configurations)? > Then no need to copy them. > So if I was a but unclear FindLIBIGL.cmake does lock in a few place by > default see: > > https://github.com/libigl/libigl-example-project/blob/master/cmake/FindLIBIGL.cmake#L17-L26 > Or if you want to use your version of libigl you can always specify > LIBIGL_INCLUDE_DIR. See my answer above: #23 (comment) > <#23 (comment)> > I'm sorry I still don't get your issue @zhfsu <https://github.com/zhfsu>. > > @cynthiaxw <https://github.com/cynthiaxw> what error message do you get? > Does your error message look like this: > > CMake Error at /usr/share/cmake-3.13/Modules/FindPackageHandleStandardArgs.cmake:137 (message): > > > libigl not found --- You can download it using: > > git clone --recursive https://github.com/libigl/libigl.git > /home/nico/test/libigl-example-project/../libigl (missing: > LIBIGL_INCLUDE_DIR) > Call Stack (most recent call first): > /usr/share/cmake-3.13/Modules/FindPackageHandleStandardArgs.cmake:378 (_FPHSA_FAILURE_MESSAGE) > cmake/FindLIBIGL.cmake:30 (find_package_handle_standard_args) > CMakeLists.txt:10 (find_package) > > > Have you tried to clone libigl inside libigl-example-project or one level > above(cd .. the clone)? > > — > You are receiving this because you were mentioned. > Reply to this email directly, view it on GitHub > <#23?email_source=notifications&email_token=AGT37JVYOETP2WDDJY6Y6T3QC7TQTA5CNFSM4HMQPJDKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD3RFAWI#issuecomment-518148185>, > or mute the thread > <https://github.com/notifications/unsubscribe-auth/AGT37JWMK4KE7DOWKCP6E2DQC7TQTANCNFSM4HMQPJDA> > . >

[BruegelN]

Hi Xi,
I'm glad that it works at least for the libigl-example-project :)
Your issue seems more related to gptoolbox, so I'm not sure if this is the right place.
Over at the gptoolbox repo I've only found one outdated issue: alecjacobson/gptoolbox#76
Did you follow the instructions at https://github.com/alecjacobson/gptoolbox/blob/master/mex/README.md for compling the C++ code with a matlab interface?
Just so you know, I neither know matlab nor use gptoolbox so you might want to open an issue at https://github.com/alecjacobson/gptoolbox if the issue is related to gptoolbox, sorry...

[cynthiaxw]

Hi Nico, I fixed the problem. I just replaced the FindLIBIGL.cmake file in the gptoolbox with yours and it magically worked. Thanks again for your help :) Xi

…

On Wed, 7 Aug 2019 at 02:33, Nico ***@***.***> wrote: Hi Xi, I'm glad that it works at least for the libigl-example-project :) Your issue seems more related to gptoolbox, so I'm not sure if this is the right place. Over at the gptoolbox repo I've only found one outdated issue: alecjacobson/gptoolbox#76 <alecjacobson/gptoolbox#76> Did you follow the instructions at https://github.com/alecjacobson/gptoolbox/blob/master/mex/README.md for compling the C++ code with a matlab interface? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#23?email_source=notifications&email_token=AGT37JSMKA7XXA3SJVU3BADQDKCETA5CNFSM4HMQPJDKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD3XUXSA#issuecomment-518998984>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AGT37JR7HPW7JGT4S2KZAG3QDKCETANCNFSM4HMQPJDA> .

[javspace]

I think I have the same problem. I have followed the steps provided
in the libigl-example-project and I have the following error:

CMake Error at cmake/FindLIBIGL.cmake:34 (include):
include could not find load file:

libigl

Call Stack (most recent call first):
CMakeLists.txt:10 (find_package)

These are the steps I have followed, in case I made something wrong:

javspace2@javspace2-pc:/Downloads/libigl-test$ git clone https://github.com/libigl/libigl-example-project/
Cloning into 'libigl-example-project'...
remote: Enumerating objects: 10, done.
remote: Counting objects: 100% (10/10), done.
remote: Compressing objects: 100% (8/8), done.
remote: Total 227 (delta 3), reused 5 (delta 2), pack-reused 217
Receiving objects: 100% (227/227), 57.85 KiB | 1.01 MiB/s, done.
Resolving deltas: 100% (102/102), done.
javspace2@javspace2-pc:/Downloads/libigl-test$ cd libigl-example-project/
javspace2@javspace2-pc:/Downloads/libigl-test/libigl-example-project$ git clone https://github.com/libigl/libigl
Cloning into 'libigl'...
remote: Enumerating objects: 157, done.
remote: Counting objects: 100% (157/157), done.
remote: Compressing objects: 100% (107/107), done.
remote: Total 40184 (delta 69), reused 81 (delta 37), pack-reused 40027
Receiving objects: 100% (40184/40184), 10.69 MiB | 11.11 MiB/s, done.
Resolving deltas: 100% (24990/24990), done.
javspace2@javspace2-pc:/Downloads/libigl-test/libigl-example-project$ mkdir build
javspace2@javspace2-pc:/Downloads/libigl-test/libigl-example-project$ cd build
javspace2@javspace2-pc:/Downloads/libigl-test/libigl-example-project/build$ cmake ..
-- The C compiler identification is GNU 9.3.0
-- The CXX compiler identification is GNU 9.3.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Error at cmake/FindLIBIGL.cmake:34 (include):
include could not find load file:

libigl

Call Stack (most recent call first):
CMakeLists.txt:10 (find_package)

-- Configuring incomplete, errors occurred!
See also "/home/javspace2/Downloads/libigl-test/libigl-example-project/build/CMakeFiles/CMakeOutput.log".