# Trouble setting up new project with fpm-gmsh

**URL:** <https://fortran-lang.discourse.group/t/trouble-setting-up-new-project-with-fpm-gmsh/6681>\
**Category:** fpm\
**Created:** [October 24, 2023, 8:08am UTC](https://fortran-lang.discourse.group/t/trouble-setting-up-new-project-with-fpm-gmsh/6681 "2023-10-24T08:08:56Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![Tavi007](https://avatars.discourse-cdn.com/v4/letter/t/54ee81/32.png) [@Tavi007](https://fortran-lang.discourse.group/u/Tavi007)\
**Post date:** [October 24, 2023, 8:08am UTC](https://fortran-lang.discourse.group/t/trouble-setting-up-new-project-with-fpm-gmsh/6681/1 "2023-10-24T08:08:56Z")

</div>

Hey all!

I’m recently started to learn fortran and I’m still learning, so please bear with me. I want use the gmsh Fortran API and since I really like the user friendliness of fpm, I’m trying to set up my project with using [gmsh-fpm](https://github.com/gnikit/gmsh-fpm). Sadly I run into various problem, some of which I think I found a solution. Here is a rundown of what I tried.  
First I start a new project.

```auto
fpm new my_gmsh_project

```

next I added the dependency to the fpm.toml just like the github readme tells me

```auto
[dependencies]
gmsh-fpm = { git="https://github.com/gnikit/gmsh-fpm.git" }

```

I also downloaded the newest version of the gmsh sdk from [here](https://gmsh.info/#Download)  
Then I try to build the project the first time using

```auto
fpm build --link-flag "-LC:\Thomas\Programme\gmsh-4.11.1-sdk\lib"

```

But I get an error, while fpm is pulling the gmsh-fpm repository:

```auto
<ERROR> *cmd_build* Model error: Dependency name 'gmsh' found, but expected 'gmsh-fpm' instead
STOP 1

```

Kinda weird, but let’s try to change ‘gmsh-fpm’ to ‘gmsh’ in the .toml file and try again. This time fpm was succesful. In build/depedencies I can see the downloaded repository ‘gmsh’ (also the duplicate gmsh-fpm from the first try compiling. I deleted this one).

Seems like I’m almost done, however when I try to actually use the API, an error occures and I can’t figure out the reason. Here is my small program

```auto
program main
   use, intrinsic :: iso_c_binding
   use gmsh
   implicit none

   type(gmsh_t) :: gmsh

   ! Before using any functions in the Python API, Gmsh must be initialized:
   call gmsh%initialize()

   ! This should be called when you are done using the Gmsh Python API:
   call gmsh%finalize()
end program main

```

Just start and close gmsh. Nothing to fancy. And here is the error I get:

```auto
PS C:\Thomas\FortranTest\my_gmsh_project> fpm run --link-flag "-LC:\Thomas\Programme\gmsh-4.11.1-sdk\lib"
gmsh.f90 done.
libmy_gmsh_project.a done.
main.f90 done.
my_gmsh_project.exe failed.
[100%] Compiling...
C:/Program Files/gcc/bin/../lib/gcc/x86_64-w64-mingw32/13.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: build\gfortran_50F62D7499E64B65\my_gmsh_project\libmy_gmsh_project.a(build_dependencies_gmsh_src_gmsh.f90.o): in function `__gmsh_MOD_gmshmodelmeshgetvisibility':
C:\Thomas\FortranTest\my_gmsh_project/build/dependencies/gmsh/src/gmsh.f90:7107: undefined reference to `gmshModelMeshGetVisibility'
C:/Program Files/gcc/bin/../lib/gcc/x86_64-w64-mingw32/13.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: build\gfortran_50F62D7499E64B65\my_gmsh_project\libmy_gmsh_project.a(build_dependencies_gmsh_src_gmsh.f90.o): in function `__gmsh_MOD_gmshmodelmeshcomputerenumbering':
C:\Thomas\FortranTest\my_gmsh_project/build/dependencies/gmsh/src/gmsh.f90:6588: undefined reference to `gmshModelMeshComputeRenumbering'
C:/Program Files/gcc/bin/../lib/gcc/x86_64-w64-mingw32/13.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: build\gfortran_50F62D7499E64B65\my_gmsh_project\libmy_gmsh_project.a(build_dependencies_gmsh_src_gmsh.f90.o): in function `__gmsh_MOD_gmshmodelgetentitiesforphysicalname':
C:\Thomas\FortranTest\my_gmsh_project/build/dependencies/gmsh/src/gmsh.f90:1550: undefined reference to `gmshModelGetEntitiesForPhysicalName'
collect2.exe: error: ld returned 1 exit status
<ERROR> Compilation failed for object " my_gmsh_project.exe "
<ERROR> stopping due to failed compilation
STOP 1

```

And with this error I’m stumped. It seems really weird, because I can find these procedures in the gmsh.f90 file of the dependecy, but somehow they are gone, when building? Or does the error occure, because fpm can’t find these references while linking to the gmsh sdk?

If you need additional information, let me know.

---

<div class="post-metadata">

**Author:** ![Arjen](https://avatars.discourse-cdn.com/v4/letter/a/b9bd4f/32.png) [@Arjen](https://fortran-lang.discourse.group/u/Arjen)\
**Post date:** [October 24, 2023, 12:03pm UTC](https://fortran-lang.discourse.group/t/trouble-setting-up-new-project-with-fpm-gmsh/6681/2 "2023-10-24T12:03:23Z")

</div>

Welcome to the forum!

Unfortunately, I cannot help you with this problem, but @gnikit, the author of gmsh-fpm is a regular here.

---

<div class="post-metadata">

**Author:** ![gnikit](https://yyz2.discourse-cdn.com/free1/user_avatar/fortran-lang.discourse.group/gnikit/32/1213_2.png) [@gnikit](https://fortran-lang.discourse.group/u/gnikit)\
**Post date:** [October 24, 2023, 8:18pm UTC](https://fortran-lang.discourse.group/t/trouble-setting-up-new-project-with-fpm-gmsh/6681/3 "2023-10-24T20:18:47Z")

</div>

Welcome to Fortran-lang @Tavi007!

You almost got the config right:

In your `fpm.toml` use (4.11.1 is the latest stable version)

```toml
gmsh = { git="https://github.com/gnikit/gmsh-fpm.git", tag = "4.11.1" }

```

When you run the application via the terminal use this (adjusted for the path to your SDK)

```bash
LD_LIBRARY_PATH=./gmsh-4.11.1-Linux64-sdk/lib/ fpm run --link-flag "-L ./gmsh-4.11.1-Linux6
4-sdk/lib/"

```

The usual tricks with `LD_LIBRARY_PATH` and `LIBRARY_PATH` here work e.g.

```bash
export LD_LIBRARY_PATH=`pwd`/gmsh-4.11.1-Linux64-sdk/lib:$LD_LIBRARY_PATH
fpm run --link-flag "-L ./gmsh-4.11.1-Linux64-sdk/lib"

```

or

For `gfortran` you can remove explicitly having to link to `libgmsh` by adding  
the `lib` directory into your `LIBRARY_PATH` environment variable for `gfortran`  
to search before compiling e,g.

```bash
export LIBRARY_PATH=/path/to/gmsh-sdk/lib:$LIBRARY_PATH
fpm run
```

---

<div class="post-metadata">

**Author:** ![Tavi007](https://avatars.discourse-cdn.com/v4/letter/t/54ee81/32.png) [@Tavi007](https://fortran-lang.discourse.group/u/Tavi007)\
**Post date:** [October 25, 2023, 7:43am UTC](https://fortran-lang.discourse.group/t/trouble-setting-up-new-project-with-fpm-gmsh/6681/4 "2023-10-25T07:43:15Z")

</div>

Hey @gnikit .Thank you very much.  
I got it finally working, though with one small hiccup. The Programm could be build successfully, however running the programm result in an error: the gmsh-4.11.dll was not found. Copying the .dll from the sdk/lib folder into my project fixed the issue, but left me wondering, if it is possible for fpm to do that automatically if needed.

But for now I’m happy with the solution I have.

---

<div class="post-metadata">

**Author:** ![Tavi007](https://avatars.discourse-cdn.com/v4/letter/t/54ee81/32.png) [@Tavi007](https://fortran-lang.discourse.group/u/Tavi007)\
**Post date:** [June 3, 2024, 10:53am UTC](https://fortran-lang.discourse.group/t/trouble-setting-up-new-project-with-fpm-gmsh/6681/5 "2024-06-03T10:53:23Z")

</div>

Hello, again. The solution has been working fine, however since my last post I’ve been working on other projects, which are compiled with ifx instead of gfortran. Now I would like to change the compiler of my meshing tool too, but I run into an error.

The command I run:

```auto
fpm run --compiler ifx --profile debug --link-flag "-L {path to ./gmsh-4.11.1-Linux64-sdk/lib}"

```

The error I get:

```auto
LINK : fatal error LNK1104: File "gmsh.lib" can not be opened.

```

I hope @gnikit can help me out once again 🙂

---

<div class="post-metadata">

**Author:** ![gnikit](https://yyz2.discourse-cdn.com/free1/user_avatar/fortran-lang.discourse.group/gnikit/32/1213_2.png) [@gnikit](https://fortran-lang.discourse.group/u/gnikit)\
**Post date:** [June 3, 2024, 11:24pm UTC](https://fortran-lang.discourse.group/t/trouble-setting-up-new-project-with-fpm-gmsh/6681/6 "2024-06-03T23:24:02Z")

</div>

There are a couple of ways you can go about this.

I suspect the most robust way is building Gmsh with the Intel compiler suite. They have a instructions on how to do so on their Wiki over at GitLab.

The second option I can think off is, because Gmsh is written in C++, compiler ABIs are standardised. So you could get the GCC-compiled Gmsh library, create an Intel wrapper library around it using the Intel C++ compiler and then finally point fpm using your Intel Fortran compiler to the Intel wrapper library. Gmsh ships with a wrapper library header file for this exact purpose, although I don’t remember exactly how one would use it.

Just make sure when generating the wrapper library to use the same version of std and ABI.