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AngelSWI_Reason_ReportException does not return accoring to the ARM documentation, so it is valid to mark _kill() as noreturn. This way, the compiler does not warn about _exit() returning a value despite being noreturn. 2018-10-01 Christophe Lyon <christophe.lyon@linaro.org> * libgloss/arm/_exit.c (_exit): Declare _kill() as noreturn. * libgloss/arm/_exit.c (_kill): Likewise. Remove the return statements. * newlib/libc/sys/arm/syscalls.c (_kill): Likewise..