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Re: embedded MIPS multilib selection or isa level setting error


   Date: Mon, 17 Apr 2000 08:20:15 -0500
   From: Joel Sherrill <joel.sherrill@OARcorp.com>

   bash-2.03$ mips64orion-rtems-gcc -mcpu=4600  main.c -lc
   /opt/rtems/mips64orion-rtems/bin/ld: warning: 
	   cannot find entry symbol _start; defaulting to 0000000000400000

   But when you change the cpu option to -mcpu=4650 or -m4650, this
   gives an ISA mismatch on the ld.

   bash-2.03$ mips64orion-rtems-gcc -mcpu=4650  main.c -lc
   /opt/rtems/mips64orion-rtems/bin/ld: /tmp/ccqIhepE.o: 
	 ISA mismatch (-mips3) with previous modules (-mips1)
   Bad value: failed to merge target specific data of file /tmp/ccqIhepE.o
   /opt/rtems/mips64orion-rtems/bin/ld: warning: 
	   cannot find entry symbol _start; defaulting to 0000000000400000
   collect2: ld returned 1 exit status

   I take this to mean that main.c->main.o is somehow compiled for 
   ISA level 1 and is being linked against an ISA level 3 library.

It's the other way around.  main.c was compiled -mips3, but some
previous object file was compiled -mips1.  Since you are getting the
error when the linker sees main.c, and the linker will normally see
that before any library, this most likely indicates that some startup
file is compiled -mips1.

   But to make matters worse, specifying -m4650 and -mcpu=4650 do 
   not result in the same multilib variant being selected.

   -m4650     selects "single"
   -mcpu=4650 selects "default"

   Without knowing the expected behavior here, all I can do is say that
   something is wrong with the current behavior. :)

This is documented.  The -mcpu option affects only scheduling, not
code generation.

Ian

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