Overall Options
              -c -S -E -o file -pipe -v -x language

       Language Options
              -ansi -fcond-mismatch -fdollars-in-identifiers
-fexternal-templates -fno-asm -fno-builtin -fhosted -fno-hosted -ffreestanding
              -fno-freestanding -fno-strict-prototype -fsigned-bitfields
-fsigned-char -funsigned-bitfields -funsigned-char -fwritable-strings
              -traditional -traditional-cpp -trigraphs

       Warning Options
              -fsyntax-only -pedantic -pedantic-errors -w -W -Wall 
-Waggregate-return -Wcast-align -Wcast-qual -Wchar-subscript -Wcomment
              -Wconversion -Werror -Wformat -Wid-clash-len -Wimplicit 
-Wimplicit-int -Wimplicit-function-declaration -Winline -Wlong-long -Wmain
              -Wmissing-prototypes -Wmissing-declarations -Wnested-externs 
-Wno-import -Wparentheses -Wpointer-arith -Wredundant-decls
              -Wreturn-type -Wshadow -Wstrict-prototypes -Wswitch 
-Wtraditional -Wtrigraphs -Wuninitialized -Wunused -Wunused-function -Wunused-
              label -Wunused-parameter -Wunused-variable -Wunused-value 
-Wwrite-strings

       Debugging Options
              -a -dletters -fpretend-float -g -glevel -gcoff -gxcoff -gxcoff+ 
-gdwarf -gdwarf+ -gstabs -gstabs+ -ggdb -p -pg -save-temps
              -print-file-name=library -print-libgcc-file-name 
-print-prog-name=program

       Optimization Options
              -fcaller-saves -fcse-follow-jumps -fcse-skip-blocks 
-fdelayed-branch -felide-constructors -fexpensive-optimizations -ffast-math
              -ffloat-store -fforce-addr -fforce-mem -finline-functions 
-fkeep-inline-functions -fmemoize-lookups -fno-default-inline
              -fno-defer-pop -fno-function-cse -fno-inline -fno-peephole 
-fomit-frame-pointer -frerun-cse-after-loop -fschedule-insns
              -fschedule-insns2 -fstrength-reduce -fthread-jumps 
-funroll-all-loops -funroll-loops -O -O2 -O3

       Preprocessor Options
              -Aassertion -C -dD -dM -dN -Dmacro[=defn] -E -H -idirafter dir 
-include file -imacros file -iprefix file -iwithprefix dir -M -MD
              -MM -MMD -nostdinc -P -Umacro -undef

       Assembler Option
              -Wa,option

       Linker Options
              -llibrary -nostartfiles -nostdlib -static -shared -symbolic 
-Xlinker option -Wl,option -u symbol

       Directory Options
              -Bprefix -Idir -I- -Ldir

       Target Options
              -b  machine -V version

       Code Generation Options
              -fcall-saved-reg -fcall-used-reg -ffixed-reg 
-finhibit-size-directive -fnonnull-objects -fno-common -fno-ident 
-fno-gnu-linker
              -fpcc-struct-return -fpic -fPIC -freg-struct-return 
-fshared-data -fshort-enums -fshort-double -fvolatile -fvolatile-global
              -fverbose-asm