https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107675
--- Comment #4 from Tamar Christina <tnfchris at gcc dot gnu.org> --- (In reply to Jakub Jelinek from comment #2) > Does the binary and libstdc++.so have PT_GNU_EH_FRAME header including > binary search table (readelf -Wl | grep GNU_EH_FRAME)? > During startup I think there just shouldn't be any exceptions thrown or > backtraces computed, so I'd think the FDEs should just be registered and > nothing else. Yes both do: > ~/libstdcpp-test$ readelf -Wl ~/libstdcpp-test/gcc-trunk/lib64/libstdc++.so.6 > | grep GNU_EH_FRAME GNU_EH_FRAME 0x1c5658 0x00000000001c5658 0x00000000001c5658 0x008e8c 0x008e8c R 0x4 > ~/libstdcpp-test$ readelf -Wl gcc-13-s.exe | grep GNU_EH_FRAME GNU_EH_FRAME 0x000724 0x0000000000400724 0x0000000000400724 0x000044 0x000044 R 0x4 also the difference seems more pronounced when statically linked. (In reply to Florian Weimer from comment #3) > Would you please put a breakpoint on fde_single_encoding_compare and report for GCC-13 the trace is: Reading symbols from ./gcc-13.exe... (gdb) b fde_single_encoding_compare Breakpoint 1 at 0x451630: file /opt/buildAgent/work/5c94c4ced6ebfcd0/libgcc/unwind-dw2-fde.c, line 425. (gdb) r Starting program: ~/libstdcpp-test/gcc-13.exe Breakpoint 1, fde_single_encoding_compare (ob=0x48cfe8 <object>, x=0x46d098, y=0x46d084) at /opt/buildAgent/work/5c94c4ced6ebfcd0/libgcc/unwind-dw2-fde.c:425 425 /opt/buildAgent/work/5c94c4ced6ebfcd0/libgcc/unwind-dw2-fde.c: No such file or directory. (gdb) bt #0 fde_single_encoding_compare (ob=0x48cfe8 <object>, x=0x46d098, y=0x46d084) at /opt/buildAgent/work/5c94c4ced6ebfcd0/libgcc/unwind-dw2-fde.c:425 #1 0x0000000000451b8c in fde_split (erratic=<optimized out>, linear=<optimized out>, fde_compare=<optimized out>, ob=<optimized out>) at /opt/buildAgent/work/5c94c4ced6ebfcd0/libgcc/unwind-dw2-fde.c:660 #2 end_fde_sort (count=793, accu=0xfffffffff200, ob=0x48cfe8 <object>) at /opt/buildAgent/work/5c94c4ced6ebfcd0/libgcc/unwind-dw2-fde.c:662 #3 init_object (ob=ob@entry=0x48cfe8 <object>) at /opt/buildAgent/work/5c94c4ced6ebfcd0/libgcc/unwind-dw2-fde.c:888 #4 0x00000000004520a8 in __register_frame_info_bases (dbase=0x0, tbase=0x0, ob=0x48cfe8 <object>, begin=<optimized out>) at /opt/buildAgent/work/5c94c4ced6ebfcd0/libgcc/unwind-dw2-fde.c:130 #5 __register_frame_info_bases (dbase=0x0, tbase=0x0, ob=0x48cfe8 <object>, begin=<optimized out>) at /opt/buildAgent/work/5c94c4ced6ebfcd0/libgcc/unwind-dw2-fde.c:111 #6 __register_frame_info (begin=<optimized out>, ob=0x48cfe8 <object>) at /opt/buildAgent/work/5c94c4ced6ebfcd0/libgcc/unwind-dw2-fde.c:150 #7 0x0000000000400798 in frame_dummy () at /opt/buildAgent/work/5c94c4ced6ebfcd0/libgcc/unwind-dw2-btree.h:361 #8 0x0000000000400f90 in __libc_csu_init () at /opt/buildAgent/work/5c94c4ced6ebfcd0/libgcc/unwind-dw2-btree.h:361 #9 0x0000000000400a78 in __libc_start_main () at /opt/buildAgent/work/5c94c4ced6ebfcd0/libgcc/unwind-dw2-btree.h:361 #10 0x0000000000400688 in _start () at /opt/buildAgent/work/5c94c4ced6ebfcd0/libgcc/unwind-dw2-btree.h:361 In GCC-12 it looks like this isn't called at all: Reading symbols from ./gcc-12.exe... (gdb) b fde_single_encoding_compare Breakpoint 1 at 0x4503c0: file /opt/buildAgent/work/5c94c4ced6ebfcd0/libgcc/unwind-dw2-fde.c, line 380. (gdb) r Starting program: ~/libstdcpp-test/gcc-12.exe Hello world [Inferior 1 (process 1580999) exited normally] > the backtrace? Which target are you testing? Testing aarch64-none-linux-gnu