From 681e4add145a71735da85193403d77abec8bb0ef Mon Sep 17 00:00:00 2001
From: Sebastian Ehlert <28669218+awvwgk@users.noreply.github.com>
Date: Sun, 8 Nov 2020 17:00:35 +0100
Subject: Add package with external dependency

- BLAS is installed on the OSX and Linux image, but not on Windows
---
 .../link_external/src/wrapped_gemv.f90             | 126 +++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 example_packages/link_external/src/wrapped_gemv.f90

(limited to 'example_packages/link_external/src/wrapped_gemv.f90')

diff --git a/example_packages/link_external/src/wrapped_gemv.f90 b/example_packages/link_external/src/wrapped_gemv.f90
new file mode 100644
index 0000000..5ff1d7c
--- /dev/null
+++ b/example_packages/link_external/src/wrapped_gemv.f90
@@ -0,0 +1,126 @@
+!> Performs one of the matrix-vector operations
+!>
+!>    y := alpha*A*x + beta*y,   or   y := alpha*A**T*x + beta*y,
+!>
+!> where alpha and beta are scalars, x and y are vectors and A is an
+!> m by n matrix.
+module wrapped_gemv
+  implicit none
+  private
+
+  public :: sp, dp, gemv
+
+  integer, parameter :: sp = selected_real_kind(6)
+  integer, parameter :: dp = selected_real_kind(15)
+
+
+  interface gemv
+    module procedure :: wrap_sgemv
+    module procedure :: wrap_dgemv
+  end interface gemv
+
+
+  interface blas_gemv
+    subroutine sgemv(trans, m, n, alpha, a, lda, x, incx, beta, y, incy)
+      import :: sp
+      real(sp), intent(in) :: a(lda, *)
+      real(sp), intent(in) :: x(*)
+      real(sp), intent(inout) :: y(*)
+      real(sp), intent(in) :: alpha
+      real(sp), intent(in) :: beta
+      character(len=1), intent(in) :: trans
+      integer, intent(in) :: incx
+      integer, intent(in) :: incy
+      integer, intent(in) :: m
+      integer, intent(in) :: n
+      integer, intent(in) :: lda
+    end subroutine sgemv
+    subroutine dgemv(trans, m, n, alpha, a, lda, x, incx, beta, y, incy)
+      import :: dp
+      real(dp), intent(in) :: a(lda, *)
+      real(dp), intent(in) :: x(*)
+      real(dp), intent(inout) :: y(*)
+      real(dp), intent(in) :: alpha
+      real(dp), intent(in) :: beta
+      character(len=1), intent(in) :: trans
+      integer, intent(in) :: incx
+      integer, intent(in) :: incy
+      integer, intent(in) :: m
+      integer, intent(in) :: n
+      integer, intent(in) :: lda
+    end subroutine dgemv
+  end interface blas_gemv
+
+
+contains
+
+
+  subroutine wrap_sgemv(amat, xvec, yvec, alpha, beta, trans)
+    real(sp), intent(in) :: amat(:, :)
+    real(sp), intent(in) :: xvec(:)
+    real(sp), intent(inout) :: yvec(:)
+    real(sp), intent(in), optional :: alpha
+    real(sp), intent(in), optional :: beta
+    character(len=1), intent(in), optional :: trans
+    real(sp) :: a, b
+    character(len=1) :: tra
+    integer :: incx, incy, m, n, lda
+    if (present(alpha)) then
+      a = alpha
+    else
+      a = 1.0_sp
+    end if
+    if (present(beta)) then
+      b = beta
+    else
+      b = 0
+    end if
+    if (present(trans)) then
+      tra = trans
+    else
+      tra = 'n'
+    end if
+    incx = 1
+    incy = 1
+    lda = max(1, size(amat, 1))
+    m = size(amat, 1)
+    n = size(amat, 2)
+    call blas_gemv(tra, m, n, a, amat, lda, xvec, incx, b, yvec, incy)
+  end subroutine wrap_sgemv
+
+
+  subroutine wrap_dgemv(amat, xvec, yvec, alpha, beta, trans)
+    real(dp), intent(in) :: amat(:, :)
+    real(dp), intent(in) :: xvec(:)
+    real(dp), intent(inout) :: yvec(:)
+    real(dp), intent(in), optional :: alpha
+    real(dp), intent(in), optional :: beta
+    character(len=1), intent(in), optional :: trans
+    real(dp) :: a, b
+    character(len=1) :: tra
+    integer :: incx, incy, m, n, lda
+    if (present(alpha)) then
+      a = alpha
+    else
+      a = 1.0_dp
+    end if
+    if (present(beta)) then
+      b = beta
+    else
+      b = 0
+    end if
+    if (present(trans)) then
+      tra = trans
+    else
+      tra = 'n'
+    end if
+    incx = 1
+    incy = 1
+    lda = max(1, size(amat, 1))
+    m = size(amat, 1)
+    n = size(amat, 2)
+    call blas_gemv(tra, m, n, a, amat, lda, xvec, incx, b, yvec, incy)
+  end subroutine wrap_dgemv
+
+
+end module wrapped_gemv
-- 
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