Don't use grep or sort

tools/flang2/utils/upper/CMakeLists.txt

@@ -21,10 +21,24 @@ add_executable(upperl
   )
 
 # Generate upper tables
+file(STRINGS "${UTILS_UPPER_DIR}/upperilm.in" UPPERILM_H_CONTENTS)
+list(SORT UPPERILM_H_CONTENTS)
+set(UPPERILM_H_CONTENTS_SORTED "")
+foreach(Line ${UPPERILM_H_CONTENTS})
+  # Don't modify the line if it contains #local at the end.
+  if(NOT "${Line}" MATCHES "^ *\#$")
+    if ("${UPPERILM_H_CONTENTS_SORTED}" STREQUAL "")
+		set(UPPERILM_H_CONTENTS_SORTED "${Line}")
+	else()
+		set(UPPERILM_H_CONTENTS_SORTED "${UPPERILM_H_CONTENTS_SORTED}\n${Line}")
+	endif()
+  endif()
+endforeach()
+
+file(WRITE ${UTILS_UPPER_BIN_DIR}/upperilm.sort "${UPPERILM_H_CONTENTS_SORTED}")
 
 add_custom_command( 
   OUTPUT ${UTILS_UPPER_BIN_DIR}/upperilm.h
-  COMMAND LC_ALL=C sort ${UTILS_UPPER_DIR}/upperilm.in | grep -v "^ *\#" > ${UTILS_UPPER_BIN_DIR}/upperilm.sort
   COMMAND ${CMAKE_BINARY_DIR}/bin/upperl ${UTILS_UPPER_BIN_DIR}/upperilm.sort ${UTILS_UPPER_BIN_DIR}/upperilm.h
   DEPENDS upperl ${UTILS_UPPER_DIR}/upperilm.in
   )