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ARM: -O3 triggers compiler error #3734

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Hello, compiling my source code, I encountered the following compiler error: "no source": Error: #3734: __packed qualifier dropped when passing argument to unprototyped function The MCU architecture is Cortex-M0. The error is triggered when I change the compiler optimisation from o2 to o3. All the routines that the compiler labelled as unprototyped have the prototype in a separate header file. The prototypes are always included and never disabl

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