On Thu, Mar 31, 2016 at 5:12 AM, fengwei.yin <fengwei....@linaro.org> wrote:
> Because gcc 4.9 could build this file without any issue, I apply
> --save-temps
> with gcc 4.9. The ii file is attached. Can't see significant differences.
There is a patch in gcc-5 to make unified assembler syntax the
default. Unfortunately, it changes how extended asms work, which is
perhaps a bug. The message claims it doesn't affect extended asms,
but it does.
https://gcc.gnu.org/ml/gcc-patches/2015-11/msg01196.html
The interesting bit is the change to ASM_APP_OFF.
gcc-4.9 emits a .thumb after the extended asm to switch back into
thumb mode just in case. gcc-5.3 instead emits .syntax unified, which
doesn't change the arm/thumb mode, just the syntax supported. This is
arguably a bug, but this doesn't immediately help you. It could take
a little time to get gcc-5.x source fixed, and then the compiler
binary releases. Or alternatively we could fix the asm to work with
gcc 5.
Jim
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