outsource detect functions

modules/cblas.cmake

@@ -20,10 +20,6 @@
 option(ENABLE_CBLAS "Detect and link to 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)
@@ -68,6 +64,10 @@ if(ENABLE_CBLAS)
     set(CBLAS_LIBRARIES "undefined")
     set(CBLAS_INCLUDE_DIR "undefined")
 
+    if(ENABLE_STATIC_LINKING)
+        set(CMAKE_FIND_LIBRARY_SUFFIXES .a)
+    endif()
+
     if(APPLE)
         _find_include_dir(Accelerate/Accelerate.h /usr CBLAS_INCLUDE_DIR)
         _find_library(Accelerate cblas_dgemm CBLAS_LIBRARIES)
@@ -76,7 +76,9 @@ if(ENABLE_CBLAS)
         _find_library(cblas cblas_dgemm CBLAS_LIBRARIES)
     endif()
 
-    if(NOT ${CBLAS_INCLUDE_DIR} STREQUAL "undefined" AND NOT ${CBLAS_LIBRARIES} STREQUAL "undefined")
-        set(CBLAS_FOUND TRUE)
+    if(NOT "${CBLAS_LIBRARIES}" STREQUAL "undefined")
+        if(NOT "${CBLAS_INCLUDE_DIR}" STREQUAL "undefined")
+            set(CBLAS_FOUND TRUE)
+        endif()
     endif()
 endif()

modules/detect/detect_include_files.cmake

@@ -0,0 +1,16 @@
+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()

modules/detect/detect_libraries.cmake

@@ -0,0 +1,22 @@
+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()