On 31/03/16 18:26, Jim Wilson wrote:
On Thu, Mar 31, 2016 at 5:12 AM, fengwei.yin fengwei.yin@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
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