Debugging problem

[Davide]

Hi,

I've been using the program for a couple of weeks, and I'm still quite inexperienced. I downloaded the tutorial "demo_CH_buildsystem.cpp" but when I try to compile it in Visual Studio, it gives me the following error: 'ChLinkMotorRotationSpeed.h': No such file or directory. I can't understand the reason for it although i've included it. Could someone help me?

[Dario Mangoni]

Hi Davide,
the wording "I downloaded the tutorial demo_CH....." sounds a little awkward to me: you cannot download just a single file and compile it. So maybe it's really a stupid question but: did you compile the Chrono library first?
Did you follow the install instructions? https://api.projectchrono.org/development/tutorial_install_chrono.html
If so, can you send us the CMake log? 

Dario

P.S. the CMake log is the one at the bottom here:

[Davide]

Hi Dario,

I am an absolute beginner and I apologise if I have missed something obvious. I followed the installation as you mentioned in the link, but i'm having some troubles:

- Although i installed Microsoft MPI,  it doesn't found it during the installation. It gives me the following message: CMake Warning at src/chrono_vehicle/cosim/CMakeLists.txt:9 (message):

Chrono::Vehicle cosimulation support requires MPI, but MPI not found;

- I wrote the correct directory for the Irrlicht library, but it gives me the following warning:  CMake Warning at src/chrono_irrlicht/CMakeLists.txt:144 (TARGET_LINK_LIBRARIES):

Target "ChronoEngine_irrlicht" requests linking to directory "C:/Users/USER/Documents/libraries/irrlicht-1.8.2". Targets may link only to libraries. CMake is dropping the item.

In the  CMake log, I flagged the same module proposed in the installation guide. 

Thank you in advance for your help!

[Dario Mangoni]

Hi Davide,
probably I misguided you: by sending the CMake log I meant to copy and paste all the text that you find below the Configure|Generate|OpenProject buttons.
Moreover, it would be great if you can also attach the CMakeCache.txt file that you can find in your chrono_build folder.

Anyway, few suggestions:

• except if you really need to cosimulate vehicles or other very complex/heavy simulation don't worry about the missing MPI at all: the warning you are getting shouldn't compromise the basic functionalities of Chrono core modules;
• I would recommend to update Irrlicht to 1.8.4
• did you intentionally unflagged BUILD_SHARED_LIBS? By default it should be set and for the time being we do not recommend to unflag it except if you really know what you are doing and/or you strongly need Chrono as static library

[Davide]

Hi Dario,

thank you very much for the suggestion! I followed your indications and now it seems to work. Anyway, I provide to you the right CMake log (I copied and pasted in the Cmake log.txt file just to be more tidy) and CMakeCache.txt file.

However, i tried to build a project following the guide on the website, but when i configure Cmake it gives me the following error:  

CMake Error at C:/Users/USER/Documents/chrono_build/cmake/chrono-config.cmake:298 (list):

Syntax error in cmake code at

C:/Users/USER/Documents/chrono_build/cmake/chrono-config.cmake:298

when parsing string

C:\Users\USER\Documents\libraries\irrlicht-1.8.5/include

Invalid character escape '\U'.
Call Stack (most recent call first):
CMakeLists.txt:65 (find_package)

I apologize for my insistence, but I have to do my master thesis using this program and I'm trying to figure out how to use it properly.

Thank you for your support!

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[Dario Mangoni]

Hi Davide,
the reason for this error is that you provided a path for Irrlicht that contains backslashes '\'. You need to replace them with forward slashes '/' since the backslash is intended as an escape character.
Before building any project (i.e. using the 'template_project' that you can find in the repo) make sure to build the Chrono library properly.

I think that after this fix you should be good to go.

Dario

[Davide]

Hi Dario,

thank you for the clarifications. However, what do you mean with "building the Chrono library correctly"?

To view this discussion on the web visit https://groups.google.com/d/msgid/projectchrono/0128024f-a561-454a-ab8d-33923aab1aebn%40googlegroups.com.

[Radu Serban]

Davide,

What Dario was saying is that you should make sure you have the Chrono libraries built properly and the Chrono demos running before even attempting to use Chrono in some external project. 

In your case however, that was likely the case. Indeed, even if you used backslashes in setting the Irrlicht installation path during CMake configuration of Chrono that probably did not affect the configuration and build of Chrono (since CMake can deal with those backslashes). The issue here was that those backslashes were propagated to the Chrono project configuration script and that’s where the issue occurred. If you followed Dario’s suggestion of replacing those from the beginning in the Chrono configuration stage, you should be fine. 

--Radu

Il giorno martedì 17 ottobre 2023 alle 10:35:47 UTC+2 davide.f...@gmail.com ha scritto:

Hi,

I've been using the program for a couple of weeks, and I'm still quite inexperienced. I downloaded the tutorial "demo_CH_buildsystem.cpp" but when I try to compile it in Visual Studio, it gives me the following error: 'ChLinkMotorRotationSpeed.h': No such file or directory. I can't understand the reason for it although i've included it. Could someone help me?

 

 

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[Davide]

Hi,
Following your suggestions i finally manged to build correctly my first project, so thank you very much for your help!

Davide

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