More shell variables

What about adding  -lm  to link only?
 #!/gnu/usr/bin/bash

 CXXFLAGS="-Wall  -g  -ansi  -pedantic"
 LDFLAGS="-lm"

 g++  $CXXFLAGS  -c  file1.cc
 g++  $CXXFLAGS  -c  file2.cc
 g++  $CXXFLAGS  $LDFLAGS  -o  prog  \ 
                                               file1.o  file2.o