WRT http://gbenson.livejournal.com/2007/12/21/
I see where the problem is. GCC is being overzealous because of a default that was local to one file was made global on 2003-10-07, and this changed the behavior of the #if statement in explow.c's allocate_dynamic_stack_space(): #if defined (STACK_DYNAMIC_OFFSET) || defined (STACK_POINTER_OFFSET) #define MUST_ALIGN 1 #else #define MUST_ALIGN (PREFERRED_STACK_BOUNDARY < BIGGEST_ALIGNMENT) #endif Unfortunately, STACK_POINTER_OFFSET isn't a preprocessor constant on all ports. We could change the above to: #if defined (STACK_DYNAMIC_OFFSET) #define MUST_ALIGN 1 #else #define MUST_ALIGN (STACK_POINTER_OFFSET || PREFERRED_STACK_BOUNDARY < BIGGEST_ALIGNMENT) #endif but on at least one port (pa), STACK_POINTER_OFFSET depends on the size of the outgoing arguments of a function, which we don't necessarily know yet at the point we expand alloca builtins. For pa, it's never zero, but for other ports it might be, and then this would break. Thoughts, anyone? BTW, function.c still provides a no-longer-necessary default for STACK_POINTER_OFFSET. -- Alexandre Oliva http://www.lsd.ic.unicamp.br/~oliva/ FSF Latin America Board Member http://www.fsfla.org/ Red Hat Compiler Engineer [EMAIL PROTECTED], gcc.gnu.org} Free Software Evangelist [EMAIL PROTECTED], gnu.org}
