gentoo-overlay/sci-libs/clapack/files/clapack-3.2.1-findblas-r7.patch

 CMakeLists.txt         | 29 +++++++++++++++++++++++++++--
 SRC/CMakeLists.txt     |  7 ++++++-
 TESTING/CMakeLists.txt |  5 +++++
 3 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 37fb433..fe29d4c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -28,7 +28,33 @@ set(CPACK_PACKAGE_VERSION_MAJOR 3)
 set(CPACK_PACKAGE_VERSION_MINOR 2)
 set(CPACK_PACKAGE_VERSION_PATCH 1)
 
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
+if(BLAS_LIBRARIES)
+  include(CheckFortranFunctionExists)
+  set(CMAKE_REQUIRED_LIBRARIES ${BLAS_LIBRARIES})
+  CHECK_FORTRAN_FUNCTION_EXISTS("dgemm" BLAS_FOUND)
+  unset( CMAKE_REQUIRED_LIBRARIES )
+  if(BLAS_FOUND)
+    message(STATUS "--> BLAS supplied by user is WORKING, will use ${BLAS_LIBRARIES}.")
+  else(BLAS_FOUND)
+    message(ERROR "--> BLAS supplied by user is not WORKING, CANNOT USE ${BLAS_LIBRARIES}.")
+    message(ERROR "-->     Will use REFERENCE BLAS (by default)")
+    message(ERROR "-->     Or Correct your BLAS_LIBRARIES entry ")
+    message(ERROR "-->     Or Consider checking USE_OPTIMIZED_BLAS")
+  endif(BLAS_FOUND)
+else(BLAS_LIBRARIES)
+   # User did not provide a BLAS Library
+   find_package(PkgConfig)
+   pkg_check_modules(BLAS blas)
+endif (BLAS_LIBRARIES)
+
+if(NOT BLAS_FOUND)
+    message(FATAL_ERROR "--> BLAS libraries needed but not found.")
+endif(NOT BLAS_FOUND)
+
+if(BLAS_LIBRARY_DIRS)
+#   SET_TARGET_PROPERTIES(clapack PROPERTIES LINK_FLAGS ${LINK_FLAGS} -L"${BLAS_LIBRARY_DIRS}")
+	SET (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -L\"${BLAS_LIBRARY_DIRS}\"")
+endif()
 
 add_subdirectory(SRC)
 
@@ -44,4 +70,3 @@ configure_file(${CLAPACK_SOURCE_DIR}/clapack-config-version.cmake.in
   ${CLAPACK_BINARY_DIR}/clapack-config-version.cmake @ONLY)
 configure_file(${CLAPACK_SOURCE_DIR}/clapack-config.cmake.in
   ${CLAPACK_BINARY_DIR}/clapack-config.cmake @ONLY)
-
diff --git a/SRC/CMakeLists.txt b/SRC/CMakeLists.txt
index 7b75ee9..39380ed 100644
--- a/SRC/CMakeLists.txt
+++ b/SRC/CMakeLists.txt
@@ -376,8 +376,13 @@ if(BUILD_COMPLEX16)
   set(ALLOBJ  ${ZLASRC} ${ALLAUX} ${DZLAUX})
 endif()
 
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
+
 add_library(clapack SHARED ${ALLOBJ} ${ALLXOBJ})
-target_link_libraries(clapack blas f2c m)
+target_link_libraries(clapack ${BLAS_LIBRARIES} f2c m)
+if(BLAS_LIBRARY_DIRS)
+	SET_TARGET_PROPERTIES(clapack PROPERTIES LINK_FLAGS ${LINK_FLAGS} -L"${BLAS_LIBRARY_DIRS}")
+endif()
 set_target_properties(clapack PROPERTIES SOVERSION "${CLAPACK_VERSION}")
 
 install(
diff --git a/TESTING/CMakeLists.txt b/TESTING/CMakeLists.txt
index d59359d..174672e 100644
--- a/TESTING/CMakeLists.txt
+++ b/TESTING/CMakeLists.txt
@@ -4,6 +4,11 @@ if(MSVC_VERSION)
   string(REGEX REPLACE "(.*)/STACK:(.*) (.*)" "\\1/STACK:900000000000000000 \\3"
     CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
 endif()
+if(BLAS_LIBRARY_DIRS)
+#   SET_TARGET_PROPERTIES(clapack PROPERTIES LINK_FLAGS ${LINK_FLAGS} -L"${BLAS_LIBRARY_DIRS}")
+       SET (CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -L\"${BLAS_LIBRARY_DIRS}\"")
+endif()
+
 add_subdirectory(MATGEN)
 add_subdirectory(LIN)
 add_subdirectory(EIG)