How to link Lapack on Windows?

[Beliavsky]

Thanks for your project. Trying it on Windows, I get the error below. How am I supposed to link with Lapack?

>cd foreig

c:\...\foreig
>fpm install --prefix .
 + mkdir build\dependencies
Initialized empty Git repository in C:/.../foreig/build/dependencies/kinds/.git/
From https://github.com/gha3mi/kinds
 * branch            HEAD       -> FETCH_HEAD
<ERROR> Project does not contain any installable targets
STOP 1

c:\...\foreig
>fpm build
[  0%]                      kinds.f90
[ 33%]                      kinds.f90  done.
[ 33%]                     foreig.f90
[ 66%]                     foreig.f90  done.
[ 66%]                    libforeig.a
[100%]                    libforeig.a  done.
[100%] Project compiled successfully.

c:\...\foreig
>fpm test
[  0%]                      test1.f90
[ 50%]                      test1.f90  done.
[ 50%]                      test1.exe
[100%]                      test1.exe  done.

c:/programs/gcc/bin/../lib/gcc/x86_64-w64-mingw32/13.0.0/../../../../x86_64-w64-mingw32/bin/ld.exe: build\gfortran_50F62D7499E64B65\foreig\libforeig.a(src_foreig.f90.o): in function `dsyev_rel':
c:\...\foreig/././src/foreig.f90:69: undefined reference to `dsyev_'
c:/programs/gcc/bin/../lib/gcc/x86_64-w64-mingw32/13.0.0/../../../../x86_64-w64-mingw32/bin/ld.exe: c:\...\foreig/././src/foreig.f90:80: undefined reference to `dsyev_'
collect2.exe: error: ld returned 1 exit status
<ERROR> Compilation failed for object " test1.exe "
<ERROR> stopping due to failed compilation
STOP 1

[gha3mi]

@Beliavsky, thank you for your report.

I have updated the fpm.toml file in this branch https://github.com/gha3mi/foreig/tree/gha3mi/issue1:

[install]
library = true

I suggest you remove the build, lib, and include folders in the foreig project (if they exist), and then try to compile it again using fpm.

fpm install --prefix .

Alternatively, you can set the compiler and flags (for example as follows):

fpm install --compiler gfortran --flag "-llapack" --prefix .

I have tested this on my Linux system.

You can also use this module as an fpm dependency in your project without installing it:

[dependencies]
foreig = {git="https://github.com/gha3mi/foreig.git"}

Please let me know if you can run the test file using fpm:

fpm @gfortran

or

fpm @ifort

You can modify the compiler flags for this test in the response files gfortran.rsp and ifort.rsp.

[gha3mi]

@Beliavsky, If you need to configure the paths, you can utilize the following command:

fpm test --compiler gfortran --flag "-LC:\\lib -llapack -lrefblas"

---

To set lapack and blas in the fpm.toml file, you can do so by adding the following lines. However, I'm not entirely sure how to set the path:

[build]
link = ["blas", "lapack"]

---

I hope that it can solve the problem on Windows. However, I do not have access to a Windows system to test it.