Atomics: GCC fix for M23 (ARMv8-M baseline) #10705
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Add unified syntax directives to make the atomic assembler work when GCC is building for M23. GCC actually uses unified syntax when compiling C code, but puts `.syntax divided` before each piece of inline assembly when targetting Thumb-1 type devices like M0 and M23 for backwards compatibility. We can overcome this with our own `.syntax unified`. The command-line option `-masm-syntax-unified` intended to override this globally has been broken from GCC 6 to 8.0.
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@kjbracey-arm, thank you for your changes. |
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Ci started |
Test run: SUCCESSSummary: 11 of 11 test jobs passed |
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I am still having these types of issue when building for a cortex m0+ device. My compile messages say something like: |
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You can ask on the forums, the best would be to define what youa re building and what platform you got. also the flags that are defined like macros, etc. It might be that a newer Gcc version broke this again? |
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I solved my situation, I had defined "MBED_EXCLUSIVE_ACCESS" since I copied a setup for a cortex m4. It appears that MBED_EXCLUSIVE_ACCESS cannot be defined for cortex m0(+). I got a bit confused since I though that the assembler code discussed above would actually build for cortex m0(+) but my conclusion now is the it wont and should be removed from build by not defining MBED_EXCLUSIVE_ACCESS. |
Description
Add unified syntax directives to make the atomic assembler work when GCC is building for M23.
GCC actually uses unified syntax when compiling C code, but puts
.syntax dividedbefore each piece of inline assembly when targetting Thumb-1 type devices like M0 and M23 for backwards compatibility. We can overcome this with our own.syntax unified. The command-line option-masm-syntax-unifiedintended to override this globally has been broken from GCC 6 to 8.0.Fixes #10650
Pull request type