Merge pull request #6165 from martin-frbg/cmake_clapack_vis

Ensure symbol visibility for the C LAPACK in CMAKE builds

Author: martin-frbg

cmake/lapack.cmake

@@ -1054,5 +1054,5 @@ if (NOT C_LAPACK)
     set_source_files_properties(${LA_SOURCES} PROPERTIES COMPILE_FLAGS "${LAPACK_FFLAGS} -fno-tree-vectorize")
   endif()
 else ()
-  set_source_files_properties(${LA_SOURCES} PROPERTIES COMPILE_FLAGS "${LAPACK_CFLAGS}")
+  set_source_files_properties(${LA_SOURCES} PROPERTIES COMPILE_FLAGS "${LAPACK_CFLAGS} -fvisibility=default")
 endif ()