Find{BLAS,LAPACK}: Simplify appending to list of libraries

Modules/FindBLAS.cmake

@@ -239,7 +239,7 @@ macro(CHECK_BLAS_LIBRARIES LIBRARIES _prefix _name _flags _list _threadlibs _add
   foreach(_library ${_list})
     if(_library MATCHES "^-Wl,--(start|end)-group$")
       # Respect linker flags like --start/end-group (required by MKL)
-      set(${LIBRARIES} ${${LIBRARIES}} "${_library}")
+      list(APPEND ${LIBRARIES} "${_library}")
     else()
       set(_combined_name ${_combined_name}_${_library})
       if(NOT "${_threadlibs}" STREQUAL "")
@@ -253,7 +253,7 @@ macro(CHECK_BLAS_LIBRARIES LIBRARIES _prefix _name _flags _list _threadlibs _add
           PATH_SUFFIXES ${_subdirs}
         )
         mark_as_advanced(${_prefix}_${_library}_LIBRARY)
-        set(${LIBRARIES} ${${LIBRARIES}} ${${_prefix}_${_library}_LIBRARY})
+        list(APPEND ${LIBRARIES} ${${_prefix}_${_library}_LIBRARY})
         set(_libraries_work ${${_prefix}_${_library}_LIBRARY})
       endif()
     endif()
@@ -279,7 +279,7 @@ macro(CHECK_BLAS_LIBRARIES LIBRARIES _prefix _name _flags _list _threadlibs _add
     if("${_list}" STREQUAL "")
       set(${LIBRARIES} "${LIBRARIES}-PLACEHOLDER-FOR-EMPTY-LIBRARIES")
     else()
-      set(${LIBRARIES} ${${LIBRARIES}} ${_threadlibs})
+      list(APPEND ${LIBRARIES} ${_threadlibs})
     endif()
   else()
     set(${LIBRARIES} FALSE)

Modules/FindLAPACK.cmake

@@ -221,7 +221,7 @@ macro(CHECK_LAPACK_LIBRARIES LIBRARIES _prefix _name _flags _list _threadlibs _a
   foreach(_library ${_list})
     if(_library MATCHES "^-Wl,--(start|end)-group$")
       # Respect linker flags like --start/end-group (required by MKL)
-      set(${LIBRARIES} ${${LIBRARIES}} "${_library}")
+      list(APPEND ${LIBRARIES} "${_library}")
     else()
       set(_combined_name ${_combined_name}_${_library})
       if(NOT "${_threadlibs}" STREQUAL "")
@@ -235,7 +235,7 @@ macro(CHECK_LAPACK_LIBRARIES LIBRARIES _prefix _name _flags _list _threadlibs _a
           PATH_SUFFIXES ${_subdirs}
         )
         mark_as_advanced(${_prefix}_${_library}_LIBRARY)
-        set(${LIBRARIES} ${${LIBRARIES}} ${${_prefix}_${_library}_LIBRARY})
+        list(APPEND ${LIBRARIES} ${${_prefix}_${_library}_LIBRARY})
         set(_libraries_work ${${_prefix}_${_library}_LIBRARY})
       endif()
     endif()
@@ -262,7 +262,7 @@ macro(CHECK_LAPACK_LIBRARIES LIBRARIES _prefix _name _flags _list _threadlibs _a
     if("${_list}${_blas}" STREQUAL "")
       set(${LIBRARIES} "${LIBRARIES}-PLACEHOLDER-FOR-EMPTY-LIBRARIES")
     else()
-      set(${LIBRARIES} ${${LIBRARIES}} ${_blas} ${_threadlibs})
+      list(APPEND ${LIBRARIES} ${_blas} ${_threadlibs})
     endif()
   else()
     set(${LIBRARIES} FALSE)