Comment 26 for bug 675347

The simplest way to achieve that at present is probably for Ubuntu (locally) to revert the patch:

2010-10-26 Jie Zhang <email address hidden>

        Issue #1259

        Backport from mainline:

        gcc/
        2010-10-26 Jie Zhang <email address hidden>

        * stor-layout.c (layout_decl): Use the field's type to
        determine the mode and keep DECL_BIT_FIELD for a volatile
        bit-field.
        * config/arm/arm.c (arm_override_options): Default to
        -fstrict-volatile-bitfields.

        gcc/testsuite/
        2010-10-26 Jie Zhang <email address hidden>

        * gcc.target/arm/volatile-bitfields-1.c: New test.
        * gcc.target/arm/volatile-bitfields-2.c: New test.
        * gcc.target/arm/volatile-bitfields-3.c: New test.

Reverting the arm.c fragment should be enough. (This is Linaro GCC 4.5 rev 99425.)

Is that a possibility?