From sources -current as of about 24 hours ago:

mac1:/usr/src/lib/libc {110} make mcount.o
cc -O2 -DALL_STATE  -Wall -Wstrict-prototypes -Wmissing-prototypes
  -Wpointer-arith -Wno-uninitialized -Werror   -D_LIBC -DNLS -DYP
  -DHESIOD -DLIBC_SCCS -DSYSLIBC_SCCS  -D_REENTRANT 
  -I/usr/src/lib/libc/include -DINET6 -D__DBINTERFACE_PRIVATE
  -DRESOLVSORT -I. -DPOSIX_MISTAKE -DPORTMAP -DFLOATING_POINT -c
  /usr/src/lib/libc/gmon/mcount.c
/usr/src/lib/libc/gmon/mcount.c: In function `mcount':
/usr/src/lib/libc/gmon/mcount.c:198: invalid `asm': operand number out
of range
/usr/src/lib/libc/gmon/mcount.c:198: invalid `asm': operand number out
of range
*** Error code 1

Stop.

Same code compiles just find under i386 and alpha.


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