$ echo | clang -### -E - -march=native
clang version 3.4 (tags/RELEASE_34/final)
Target: x86_64-redhat-linux-gnu
Thread model: posix
 "/usr/bin/clang" "-cc1" "-triple" "x86_64-redhat-linux-gnu" "-E" "-disable-free" "-disable-llvm-verifier" "-main-file-name" "-" "-mrelocation-model" "static" "-mdisable-fp-elim" "-fmath-errno" "-masm-verbose" "-mconstructor-aliases" "-munwind-tables" "-fuse-init-array" "-target-cpu" "core-avx2" "-target-linker-version" "2.23.2" "-resource-dir" "/usr/bin/../lib/clang/3.4" "-internal-isystem" "/usr/local/include" "-internal-isystem" "/usr/bin/../lib/clang/3.4/include" "-internal-externc-isystem" "/usr/include" "-internal-externc-isystem" "/usr/lib/gcc/x86_64-redhat-linux/4.8.2/include" "-fdebug-compilation-dir" "/home/crobbins/.minetest/worlds/meh" "-ferror-limit" "19" "-fmessage-length" "100" "-mstackrealign" "-fobjc-runtime=gcc" "-fdiagnostics-show-option" "-fcolor-diagnostics" "-vectorize-slp" "-o" "-" "-x" "c" "-"