[PATCH] ARM fixed-point support [4/6]: allow overriding of fixed-point helper function names

[Julian Brown]

This patch allows the decoration of helper function names for
fixed-point support to be changed from the default "__foo" to a
different scheme, as required by the ARM EABI (these are
"vendor-specific" helpers, so should go in a particular namespace).
These are only the machine-independent changes: the ARM-specific bits
come later.

Tested alongside other patches in the series. OK to apply?

Julian

ChangeLog

    gcc/
    * config/fixed-bit.h (fixed-bit-machine.h): Include.
    (DECORATE_FIXED_NAME): Conditionally define if undefined. Use
    throughout file to decorate function names.
    * config/fixed-bit-mach-generic.h: New.

    libgcc/
    * Makefile.in (FIXED_BIT_MACHINE): New rule. Include
    target-specific or generic fixed_bit_machine_header to decorate the
    names of fixed-point helper functions.
    * fixed-obj.mk ($(o)_s$(objext)): Depend on $(FIXED_BIT_MACHINE).
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