I believe, something broke the trunk tip build recently:
Comparing stages 2 and 3
warning: gcc/cc1plus-checksum.o differs
warning: gcc/cc1-checksum.o differs
Bootstrap comparison failure!
x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/wlocale-inst.o differs
x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/future.o differs
x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/locale-inst.o differs
x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/system_error.o differs
x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/parallel_settings.o differs
x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/bitmap_allocator.o differs
x86_64-unknown-linux-gnu/libstdc++-v3/src/wlocale-inst.o differs
x86_64-unknown-linux-gnu/libstdc++-v3/src/locale-inst.o differs
x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/eh_alloc.o differs
make[2]: *** [compare] Error 1
-stage2-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/wlocale-inst.o:
file format elf64-x86-64
-stage2-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/wlocale-inst.o
+stage3-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/wlocale-inst.o:
file format elf64-x86-64
+stage3-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/wlocale-inst.o
architecture: i386:x86-64, flags 0x00000011:
HAS_RELOC, HAS_SYMS
start address 0x0000000000000000
@@ -1399,7 +1399,7 @@
CONTENTS, ALLOC, LOAD, READONLY, DATA
695
.text._ZNKSt7num_getIwSt19istreambuf_iteratorIwSt11char_traitsIwEEE6do_getES3_S3_RSt8ios_baseRSt12_Ios_IostateRy
00000038 0000000000000000 0000000000000000 00011540 2**4
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
-696
.text.startup._GLOBAL__sub_I_.._.._.._.._gccgo_git_libstdc___v3_src_wlocale_inst.cc_76D38880_14146711
000000b6 0000000000000000 0000000000000000 00011580 2**4
+696
.text.startup._GLOBAL__sub_I_.._.._.._.._gccgo_git_libstdc___v3_src_wlocale_inst.cc_76D38880_EB7C2B89
000000b6 0000000000000000 0000000000000000 00011580 2**4
...
-0000000000000000 l d
.text.startup._GLOBAL__sub_I_.._.._.._.._gccgo_git_libstdc___v3_src_wlocale_inst.cc_76D38880_14146711
0000000000000000
.text.startup._GLOBAL__sub_I_.._.._.._.._gccgo_git_libstdc___v3_src_wlocale_inst.cc_76D38880_14146711
-0000000000000000 l F
.text.startup._GLOBAL__sub_I_.._.._.._.._gccgo_git_libstdc___v3_src_wlocale_inst.cc_76D38880_14146711
00000000000000b6
_GLOBAL__sub_I_.._.._.._.._gccgo_git_libstdc___v3_src_wlocale_inst.cc_76D38880_14146711
+0000000000000000 l d
.text.startup._GLOBAL__sub_I_.._.._.._.._gccgo_git_libstdc___v3_src_wlocale_inst.cc_76D38880_EB7C2B89
0000000000000000
.text.startup._GLOBAL__sub_I_.._.._.._.._gccgo_git_libstdc___v3_src_wlocale_inst.cc_76D38880_EB7C2B89
+0000000000000000 l F
.text.startup._GLOBAL__sub_I_.._.._.._.._gccgo_git_libstdc___v3_src_wlocale_inst.cc_76D38880_EB7C2B89
00000000000000b6
_GLOBAL__sub_I_.._.._.._.._gccgo_git_libstdc___v3_src_wlocale_inst.cc_76D38880_EB7C2B89
...
