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Re: [PATCH, committed] PPC405 atomic support (PR target/21760)

From: David Edelsohn <dje at watson dot ibm dot com>
To: Andreas Schwab <schwab at suse dot de>
Cc: gcc-patches at gcc dot gnu dot org
Date: Thu, 23 Jun 2005 15:32:21 -0400
Subject: Re: [PATCH, committed] PPC405 atomic support (PR target/21760)
References: <200506231333.j5NDX4027028@makai.watson.ibm.com> <jehdfp6v18.fsf@sykes.suse.de>

>>>>> 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.

David

Follow-Ups:
- Re: [PATCH, committed] PPC405 atomic support (PR target/21760)
  - From: Geoffrey Keating

References:
- [PATCH, committed] PPC405 atomic support (PR target/21760)
  - From: David Edelsohn
- Re: [PATCH, committed] PPC405 atomic support (PR target/21760)
  - From: Andreas Schwab

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