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Re: [PATCH, committed] PPC405 atomic support (PR target/21760)
>>>>> Andreas Schwab writes:
>> + /* If configured for PPC405, support PPC405CR Erratum77. */
>> + #define PPC405_CPU_DEFAULT ("405")
>> + #if #TARGET_CPU_DEFAULT == #PPC405_CPU_DEFAULT
Andreas> What is this expression supposed to do? It doesn't match
anything defined by C89.
The expression is comparing the stringified value of the macros.
When --with-cpu is not used, TARGET_CPU_DEFAULT is defined as
#define TARGET_CPU_DEFAULT ((char *)0)
and CPP produces an error comparing something with that value.
("405") is the value to which TARGET_CPU_DEFAULT is defined in tm.h when
--with-cpu=405 is used.