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(gcc-295.info)Thumb Options

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Thumb Options
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`-mthumb-interwork'
     Generate code which supports calling between the THUMB and ARM
     instruction sets.  Without this option the two instruction sets
     cannot be reliably used inside one program.  The default is
     `-mno-thumb-interwork', since slightly smaller code is generated
     with this option.

`-mtpcs-frame'
     Generate a stack frame that is compliant with the Thumb Procedure
     Call Standard for all non-leaf functions.  (A leaf function is one
     that does not call any other functions).  The default is
     `-mno-apcs-frame'.

`-mtpcs-leaf-frame'
     Generate a stack frame that is compliant with the Thumb Procedure
     Call Standard for all leaf functions.  (A leaf function is one
     that does not call any other functions).  The default is
     `-mno-apcs-leaf-frame'.

`-mlittle-endian'
     Generate code for a processor running in little-endian mode.  This
     is the default for all standard configurations.

`-mbig-endian'
     Generate code for a processor running in big-endian mode.

`-mstructure-size-boundary=<n>'
     The size of all structures and unions will be rounded up to a
     multiple of the number of bits set by this option.  Permissable
     values are 8 and 32.  The default value varies for different
     toolchains.  For the COFF targeted toolchain the default value is
     8.  Specifying the larger number can produced faster, more
     efficient code, but can also increase the size of the program.
     The two values are potentially incompatible.  Code compiled with
     one value cannot necessarily expect to work with code or libraries
     compiled with the other value, if they exchange information using
     structures or unions.  Programmers are encouraged to use the 32
     value as future versions of the toolchain may default to this
     value.