Improve how OpenBLAS library is searched

.gitignore

@@ -185,7 +185,6 @@ cython_debug/
 
 # Shared objects (inc. Windows DLLs)
 *.dll
-*.so
 *.so.*
 *.dylib
 
@@ -211,3 +210,6 @@ modules.order
 Module.symvers
 Mkfile.old
 dkms.conf
+
+# CMake builds
+cmake-build*/

cleedpy/cleed/CMakeLists.txt

@@ -9,6 +9,9 @@ set(CMAKE_C_STANDARD_REQUIRED True)
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
 
+# Where to find CMake modules
+list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
+
 # Workaround for Apple Clang
 # Disables the warning "implicit declaration of function '...' is invalid in C99"
 if(APPLE AND "${CMAKE_C_COMPILER_ID}" STREQUAL "AppleClang")

cleedpy/cleed/cmake/FindOpenBLAS.cmake

@@ -0,0 +1,65 @@
+# cmake/Modules/FindOpenBLAS.cmake
+SET(Open_BLAS_INCLUDE_SEARCH_PATHS
+        /usr/include
+        /usr/include/openblas
+        /usr/include/openblas-base
+        /usr/local/include
+        /usr/local/include/openblas
+        /usr/local/include/openblas-base
+        /usr/local/opt/openblas/include
+        /opt/OpenBLAS/include
+        $ENV{OpenBLAS_HOME}
+        $ENV{OpenBLAS_HOME}/include
+        $ENV{OpenBLAS_HOME}/include/openblas
+)
+
+SET(Open_BLAS_LIB_SEARCH_PATHS
+        /lib/
+        /lib/openblas-base
+        /lib64/
+        /usr/lib
+        /usr/lib/openblas-base
+        /usr/lib64
+        /usr/local/lib
+        /usr/local/lib64
+        /usr/local/opt/openblas/lib
+        /opt/OpenBLAS/lib
+        $ENV{OpenBLAS}
+        $ENV{OpenBLAS}/lib
+        $ENV{OpenBLAS_HOME}
+        $ENV{OpenBLAS_HOME}/lib
+)
+
+FIND_PATH(OpenBLAS_INCLUDE_DIR NAMES cblas.h PATHS ${Open_BLAS_INCLUDE_SEARCH_PATHS})
+FIND_LIBRARY(OpenBLAS_LIB NAMES openblas PATHS ${Open_BLAS_LIB_SEARCH_PATHS})
+
+SET(OpenBLAS_FOUND ON)
+
+# Check include files
+IF(NOT OpenBLAS_INCLUDE_DIR)
+    SET(OpenBLAS_FOUND OFF)
+    MESSAGE(STATUS "Could not find OpenBLAS include. Turning OpenBLAS_FOUND off")
+ENDIF()
+
+# Check libraries
+IF(NOT OpenBLAS_LIB)
+    SET(OpenBLAS_FOUND OFF)
+    MESSAGE(STATUS "Could not find OpenBLAS lib. Turning OpenBLAS_FOUND off")
+ENDIF()
+
+IF (OpenBLAS_FOUND)
+    IF (NOT OpenBLAS_FIND_QUIETLY)
+        MESSAGE(STATUS "Found OpenBLAS libraries: ${OpenBLAS_LIB}")
+        MESSAGE(STATUS "Found OpenBLAS include: ${OpenBLAS_INCLUDE_DIR}")
+    ENDIF (NOT OpenBLAS_FIND_QUIETLY)
+ELSE (OpenBLAS_FOUND)
+    IF (OpenBLAS_FIND_REQUIRED)
+        MESSAGE(FATAL_ERROR "Could not find OpenBLAS")
+    ENDIF (OpenBLAS_FIND_REQUIRED)
+ENDIF (OpenBLAS_FOUND)
+
+MARK_AS_ADVANCED(
+        OpenBLAS_INCLUDE_DIR
+        OpenBLAS_LIB
+        OpenBLAS
+)

cleedpy/cleed/src/libmat/CMakeLists.txt

@@ -7,15 +7,9 @@ file(GLOB LIBMAT_SOURCES "mat*.c")
 # Define the library from the collected source files
 add_library(mat SHARED ${LIBMAT_SOURCES})
 
-# Find BLAS/LAPACK
-find_package(BLAS REQUIRED)
+# Find BLAS
+find_package(OpenBLAS REQUIRED)
+include_directories(${OpenBLAS_INCLUDE_DIR})
 
-# Include directories for BLAS/LAPACK
-find_file(BLAS_HEADER "cblas.h" HINTS ${CMAKE_PREFIX_PATH})
-if(BLAS_HEADER)
-    get_filename_component(BLAS_INCLUDE_DIR ${BLAS_HEADER} DIRECTORY)
-    include_directories(${BLAS_INCLUDE_DIR})
-endif()
-
-# Link libmat with BLAS/LAPACK
-target_link_libraries(mat ${BLAS_LIBRARIES})
+# Link libmat with BLAS
+target_link_libraries(mat ${OpenBLAS_LIB})