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  • kernel/arch/amd64/Makefile.inc

    r2d53cfc r2689a0b  
    3333
    3434FPU_NO_CFLAGS = -mno-sse -mno-sse2
    35 CMN1 = -m64 -mcmodel=large -mno-red-zone -fno-unwind-tables -fno-omit-frame-pointer
     35
     36#
     37# FIXME:
     38#
     39# The -fno-optimize-sibling-calls should be removed as soon as a bug
     40# in GCC concerning the "large" memory model and tail call optimization
     41# is fixed.
     42#
     43# When GCC generates a code for tail call, instead of generating ..
     44#
     45#   jmp *fnc
     46#
     47# it generates an assembly code with an illegal immediate prefix:
     48#
     49#   jmp *$fnc
     50#
     51# See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48385 for reference.
     52#
     53
     54CMN1 = -m64 -mcmodel=large -mno-red-zone -fno-unwind-tables -fno-omit-frame-pointer -fno-optimize-sibling-calls
    3655GCC_CFLAGS += $(CMN1)
    3756ICC_CFLAGS += $(CMN1)
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