On 31/03/16 18:26, Jim Wilson wrote: > 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.
The patch was intended to make unified asm as default for ARM state without having any impact with respect to unified / divided syntax for inline assembler. The change to remove .arm and .thumb is a thinko and clearly a bug : I'll fix it shortly upstream. regards Ramana > > 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 > _______________________________________________ > linaro-toolchain mailing list > linaro-toolchain@lists.linaro.org > https://lists.linaro.org/mailman/listinfo/linaro-toolchain > IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. _______________________________________________ linaro-toolchain mailing list linaro-toolchain@lists.linaro.org https://lists.linaro.org/mailman/listinfo/linaro-toolchain
