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>arm-none-eabi-gcc --help=undocument

>arm-none-eabi-gcc --help=undocument

>arm-none-eabi-gcc --help=undocument
The following options are not documented:
  --preprocess                This option lacks documentation.
  -E                          This option lacks documentation.
  -MD_                        This option lacks documentation.
  -MMD_                       This option lacks documentation.
  -Wc++0x-compat              Same as -Wc++11-compat.  Use the latter option
                              instead.
  -Wimport                    This option lacks documentation.
  -Wlarger-than-              Same as -Wlarger-than=.  Use the latter option
                              instead.
  -Wpsabi                     This option lacks documentation.
  -cpp=                       This option lacks documentation.
  -fallow-leading-underscore  This option lacks documentation.
  -faux-classpath             This option lacks documentation.
  -fbuilding-libgcc           This option lacks documentation.
  -fbuiltin-printf            Ignored.
  -fgnat-encodings=[all|gdb|minimal] Select the balance between GNAT encodings
                              and standard DWARF emitted in the debug
                              information
  -fkeep-gc-roots-live        This option lacks documentation.
  -fsaw-java-file             This option lacks documentation.
  -fsource-filename=          This option lacks documentation.
  -ftemplate-depth-           Same as -ftemplate-depth=.  Use the latter option
                              instead.
  -fuse-linker-plugin         This option lacks documentation.
  -gant                       Catch typos.
  -lang-asm                   This option lacks documentation.
  -mapcs                      This option lacks documentation.
  -mapcs-stack-check          This option lacks documentation.
  -mflip-thumb                Switch ARM/Thumb modes on alternating functions
                              for compiler testing.
  -mhard-float                Same as -mfloat-abi=.  Use the latter option
                              instead.
  -msoft-float                Same as -mfloat-abi=.  Use the latter option
                              instead.
  -std=c++0x                  Deprecated in favor of -std=c++11.  Same as
                              -std=c++11.
  -std=c++17                  Same as -std=c++1z.  Use the latter option
                              instead.
  -std=c++1y                  Deprecated in favor of -std=c++14.  Same as
                              -std=c++14.
  -std=gnu++0x                Deprecated in favor of -std=gnu++11.  Same as
                              -std=gnu++11.
  -std=gnu++17                Same as -std=gnu++1z.  Use the latter option
                              instead.
  -std=gnu++1y                Deprecated in favor of -std=gnu++14.  Same as
                              -std=gnu++14.