https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63814
--- Comment #18 from H.J. Lu <hjl.tools at gmail dot com> ---
Igor, Kirill, I confirmed r216154 is the cause of this
bug. You can checkout both r216153 and r216154. You build
2 compilers and compare results. You can build a cross
compiler with
.../gcc/configure --enable-languages=c,c++ --disable-bootstrap
--target=x86_64-apple-darwin
you will see ICE. If you build the native Linux compiler, you
will see run-time failure. The difference between good and
bad assembly code is
--- good.s 2014-11-14 14:54:54.362696443 -0800
+++ bad.s 2014-11-14 15:12:54.608434347 -0800
@@ -84,12 +84,12 @@ _ZN8CExample9MixinFuncEiPv:
.weak _ZThn4_N8CExample9MixinFuncEiPv
.type _ZThn4_N8CExample9MixinFuncEiPv, @function
_ZThn4_N8CExample9MixinFuncEiPv:
-.LFB13:
+.LFB15:
.cfi_startproc
subl $4, 4(%esp)
jmp .LTHUNK0
.cfi_endproc
-.LFE13:
+.LFE15:
.size _ZThn4_N8CExample9MixinFuncEiPv,
.-_ZThn4_N8CExample9MixinFuncEiPv
.section
.text.unlikely._ZThn4_N8CExample9MixinFuncEiPv,"axG",@progbits,_ZN8CExample9MixinFuncEiPv,comdat
.LCOLDE2:
@@ -105,20 +105,52 @@ _ZThn4_N8CExample9MixinFuncEiPv:
_Z4testR6MMixin:
.LFB11:
.cfi_startproc
- subl $16, %esp
- .cfi_def_cfa_offset 20
- movl 20(%esp), %eax
+ pushl %ebx
+ .cfi_def_cfa_offset 8
+ .cfi_offset 3, -8
+ call __x86.get_pc_thunk.bx
+ addl $_GLOBAL_OFFSET_TABLE_, %ebx
+ subl $8, %esp
+ .cfi_def_cfa_offset 16
+ movl 16(%esp), %eax
movl (%eax), %edx
+ movl (%edx), %edx
+ cmpl _ZThn4_N8CExample9MixinFuncEiPv@GOT(%ebx), %edx
+ jne .L10
+ cmpl $48879, 12(%eax)
+ jne .L14
+ addl $8, %esp
+ .cfi_remember_state
+ .cfi_def_cfa_offset 8
+ popl %ebx
+ .cfi_restore 3
+ .cfi_def_cfa_offset 4
+ ret
+ .p2align 4,,10
+ .p2align 3
+.L10:
+ .cfi_restore_state
+ subl $4, %esp
+ .cfi_def_cfa_offset 20
pushl $0
.cfi_def_cfa_offset 24
pushl $1
.cfi_def_cfa_offset 28
pushl %eax
.cfi_def_cfa_offset 32
- call *(%edx)
- addl $28, %esp
+ call *%edx
+ addl $16, %esp
+ .cfi_def_cfa_offset 16
+ addl $8, %esp
+ .cfi_remember_state
+ .cfi_def_cfa_offset 8
+ popl %ebx
+ .cfi_restore 3
.cfi_def_cfa_offset 4
ret
+.L14:
+ .cfi_restore_state
+ call abort@PLT
.cfi_endproc
.LFE11:
.size _Z4testR6MMixin, .-_Z4testR6MMixin
@@ -265,11 +297,11 @@ _ZTV8CExample:
.hidden __x86.get_pc_thunk.bx
.type __x86.get_pc_thunk.bx, @function
__x86.get_pc_thunk.bx:
-.LFB14:
+.LFB16:
.cfi_startproc
movl (%esp), %ebx
ret
.cfi_endproc
-.LFE14:
+.LFE16:
.ident "GCC: (GNU) 5.0.0 20141013 (experimental)"
.section .note.GNU-stack,"",@progbits
Please find out why PIC register change caused this.
