From c0199ccd438ddd43316ca6d33d758744a45d4ad0 Mon Sep 17 00:00:00 2001
From: Radovan Bast <bast@users.noreply.github.com>
Date: Thu, 17 Sep 2015 00:08:43 +0200
Subject: [PATCH] adding a module for cblas

---
 modules/cblas.cmake               | 78 +++++++++++++++++++++++++++++++
 test/cc_cblas/cmake/autocmake.cfg |  4 +-
 test/cc_cblas/src/CMakeLists.txt  | 11 ++---
 3 files changed, 84 insertions(+), 9 deletions(-)
 create mode 100644 modules/cblas.cmake

diff --git a/modules/cblas.cmake b/modules/cblas.cmake
new file mode 100644
index 0000000..7cd13c4
--- /dev/null
+++ b/modules/cblas.cmake
@@ -0,0 +1,78 @@
+#.rst:
+#
+# Detect and link to CBLAS. Work in progress.
+#
+# Variables used::
+#
+#   ENABLE_STATIC_LINKING
+#
+# Variables defined::
+#
+#   CBLAS_FOUND - describe me, uncached
+#   CBLAS_LIBRARIES - describe me, uncached
+#   CBLAS_INCLUDE_DIR - describe me, uncached
+#
+# autocmake.cfg configuration::
+#
+#   docopt: --cblas Detect and link to CBLAS [default: False].
+#   define: '-DENABLE_CBLAS=%s' % arguments['--cblas']
+
+option(ENABLE_CBLAS "Enable CBLAS" OFF)
+
+if(ENABLE_CBLAS)
+    if(ENABLE_STATIC_LINKING)
+        set(CMAKE_FIND_LIBRARY_SUFFIXES .a)
+    endif()
+
+    include(CheckIncludeFile)
+
+    function(_find_include_dir _names _hints _result)
+        find_path(_include_dir
+            NAMES ${_names}
+            HINTS ${_hints}
+        )
+        set(_all_include_files_work TRUE)
+        foreach(_name ${_names})
+            check_include_file(${_include_dir}/${_name} _include_file_works)
+            set(_all_include_files_work (${_all_include_files_work} AND ${_include_file_works}))
+        endforeach()
+        if(${_all_include_files_work})
+            set(${_result} ${_include_dir} PARENT_SCOPE)
+        endif()
+    endfunction()
+
+    include(CheckFunctionExists)
+
+    function(_find_library _names _check_function _result)
+        if(APPLE)
+            find_library(_lib
+                NAMES ${_names}
+                PATHS /usr/local/lib /usr/lib /usr/local/lib64 /usr/lib64
+                ENV DYLD_LIBRARY_PATH
+                )
+        else()
+            find_library(_lib
+                NAMES ${_names}
+                PATHS /usr/local/lib /usr/lib /usr/local/lib64 /usr/lib64
+                ENV LD_LIBRARY_PATH
+                )
+        endif()
+        set(CMAKE_REQUIRED_LIBRARIES ${_lib})
+        check_function_exists(${_check_function} _library_works)
+        if(${_library_works})
+            set(${_result} ${_lib} PARENT_SCOPE)
+        endif()
+    endfunction()
+
+    set(CBLAS_FOUND FALSE)
+
+    set(CBLAS_INCLUDE_DIR "undefined")
+    _find_include_dir(cblas.h /usr CBLAS_INCLUDE_DIR)
+
+    set(CBLAS_LIBRARIES "undefined")
+    _find_library(cblas cblas_dgemm CBLAS_LIBRARIES)
+
+    if(NOT ${CBLAS_INCLUDE_DIR} STREQUAL "undefined" AND NOT ${CBLAS_LIBRARIES} STREQUAL "undefined")
+        set(CBLAS_FOUND TRUE)
+    endif()
+endif()
diff --git a/test/cc_cblas/cmake/autocmake.cfg b/test/cc_cblas/cmake/autocmake.cfg
index d90fc83..45a1d2d 100644
--- a/test/cc_cblas/cmake/autocmake.cfg
+++ b/test/cc_cblas/cmake/autocmake.cfg
@@ -8,8 +8,8 @@ source: ../../../modules/cc.cmake
 [static]
 source: ../../../modules/static_linking.cmake
 
-[math_libs]
-source: ../../../modules/math_libs.cmake
+[cblas]
+source: ../../../modules/cblas.cmake
 
 [default_build_paths]
 source: ../../../modules/default_build_paths.cmake
diff --git a/test/cc_cblas/src/CMakeLists.txt b/test/cc_cblas/src/CMakeLists.txt
index 811ec3c..172fae9 100644
--- a/test/cc_cblas/src/CMakeLists.txt
+++ b/test/cc_cblas/src/CMakeLists.txt
@@ -1,10 +1,7 @@
-if(BLAS_FOUND)
-    if(${CMAKE_SYSTEM_NAME} MATCHES "Windows")
-    #windows does not find cblas.h of openblas by default
-        include_directories($ENV{PATH})
-    endif()	
+if(CBLAS_FOUND)
+    include_directories(${CBLAS_INCLUDE_DIR})
     add_executable(example example.c)
-    target_link_libraries(example ${MATH_LIBS})
+    target_link_libraries(example ${CBLAS_LIBRARIES})
 else()
-    message(FATAL_ERROR "BLAS library not found for the test cc_cblas!")
+    message(FATAL_ERROR "CBLAS library not found")
 endif()