parameter flags for checking external BLAS/LAPACK presence

Author: perazz

src/stdlib_linalg_constants.fypp

@@ -6,10 +6,36 @@ module stdlib_linalg_constants
      implicit none(type,external)
      public
 
+     ! Checks whether BLAS is provided by an external library
+#ifdef STDLIB_EXTERNAL_BLAS     
+     logical(lk), parameter :: external_blas_ilp32 = .true._lk
+#else
+     logical(lk), parameter :: external_blas_ilp32 = .false._lk
+#endif   
+#ifdef STDLIB_EXTERNAL_BLAS_I64    
+     logical(lk), parameter :: external_blas_ilp64 = .true._lk
+#else
+     logical(lk), parameter :: external_blas_ilp64 = .false._lk
+#endif   
+
+#ifdef STDLIB_EXTERNAL_LAPACK
+     logical(lk), parameter :: external_lapack_ilp32 = .true._lk
+#else
+     logical(lk), parameter :: external_lapack_ilp32 = .false._lk
+#endif   
+#ifdef STDLIB_EXTERNAL_LAPACK_I64    
+     logical(lk), parameter :: external_lapack_ilp64 = .true._lk
+#else
+     logical(lk), parameter :: external_lapack_ilp64 = .false._lk
+#endif   
+
+     ! Generic checks
+     logical(lk), parameter :: external_blas   = external_blas_ilp32   .or. external_blas_ilp64
+     logical(lk), parameter :: external_lapack = external_lapack_ilp32 .or. external_lapack_ilp64
 
      ! Support both 32-bit (ilp) and 64-bit (ilp64) integer kinds
      integer, parameter :: ilp   = int32
      integer, parameter :: ilp64 = int64
      private            :: int32, int64
-
+     
 end module stdlib_linalg_constants