message: doc: Mention other ways to conserve memory on compilation
diff: @@ -61,6 +61,14 @@ tuned to conserve memory with additional CXXFLAGS:
  ./configure CXXFLAGS="--param ggc-min-expand=1 --param ggc-min-heapsize=32768"
  +Alternatively, or in addition, debugging information can be skipped for compilation. The default compile flags are
  +`-g -O2`, and can be changed with:
  +
  + ./configure CXXFLAGS="-O2"
  +
  +Finally, clang (often less resource hungry) can be used instead of gcc, which is used by default:
  +
  + ./configure CXX=clang++ CC=clang
  ## Linux Distribution Specific Instructions
  