Preprocess macros not work when building via `fpm build` or `fpm run`

[LaplaceSoda]

Description

If we create a new project via fpm and then add following codes in fpm.toml to support openblas:

link = ["openblas"]
....
[dependencies]
stdlib = "*"
[preprocess]
[preprocess.cpp]
macros = ["STDLIB_EXTERNAL_BLAS", "STDLIB_EXTERNAL_LAPACK"]

Then add a flag in subroutine stdlib_dgemm in stdlib_linalg_blas_d.F90 to show if the stdlib_dgemm is called

454    subroutine stdlib_dgemm(transa,transb,m,n,k,alpha,a,lda,b,ldb,beta,c,ldc)
            ......
613           write(*,*)"stdlib_dgemm called!"
614           return
615     end subroutine stdlib_dgemm

And call gemm in main program:

program main
    use stdlib_linalg_blas, only: gemm
    use iso_fortran_env, only: dp => real64
    implicit none
    real(dp) :: AA(3, 4), BB(4, 4), CC(3, 4)
    integer :: i, j
    AA = reshape([1._dp, 5._dp, 9._dp, 2._dp, 6._dp, 10._dp, 3._dp, 7._dp, 11._dp, 4._dp, 8._dp, 12._dp], [3, 4])
    BB = reshape([0._dp, 0._dp, 0._dp, 1._dp, 0._dp, 0._dp, 1._dp, 0._dp, 0._dp, 1._dp, 0._dp, 0._dp, 1._dp, 0._dp, 0._dp, 0._dp], [4, 4])
    call gemm('N', 'N', 3, 4, 4, 1.0_dp, AA, 3, BB, 4, 0._dp, CC, 3)
    write (*, '(4ES8.1)') ((CC(i, j), j=1, 4), i=1, 3)
end program main

Launch the program via fpm run, and the result will show that the dgemm in openblas is not called while the stdlib_dgemm in stdlib is called.

If we build directly via compiler flags fpm build --flag "-DSTDLIB_EXTERNAL_BLAS -DSTDLIB_EXTERNAL_LAPACK -lopenblas", the result will show that the dgemm in openblas is correctly called.

Expected Behaviour

preprocess macros works normally

Version of fpm

0.10.1, alpha

Platform and Architecture

Windows

Additional Information

No response

[perazz]

Macros are not passed into the dependencies: see

https://github.com/fortran-lang/fpm/blob/f210e9d966381203ac932de985168668731a12f4/example_packages/preprocess_hello_dependency/src/preprocess_hello_dependency.f90

However, you can define dependency-based macros for stdlib like for any other dependency. The only caveat is that you will have to use a git-based formulation at this stage, because the stdlib metapackage does not implement external library finding yet:

[dependencies]
stdlib = { git="https://github.com/fortran-lang/stdlib", branch="stdlib-fpm", preprocess.cpp.macros= ["STDLIB_EXTERNAL_BLAS", "STDLIB_EXTERNAL_LAPACK"] }

[perazz]

@LaplaceSoda do you think we should close this issue?

[LaplaceSoda]

OK,thank you very much.