TARGET_ARCH

[3r6evx86te]

What is TARGET_ARCH typically expected to be set to for cross building with the 
implicit gmake rules?

The C implicit rule is:
COMPILE.c = $(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c

But most hits I see talk about defining TARGET_ARCH to be "arm" or similar.  Of 
course, doing that makes gcc say "gcc: arm: No such file or directory".

The info pages have nothing to say.

The only reference I saw in the mailing list archives was from 2005, and it 
advised just not using implicit rules.