[Bug gold/25309] New: Certain source lines when debugging with GDB are not found for an executable using gold linker, but are found if regular ld is used instead

[ciro.santilli at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25309

            Bug ID: 25309
           Summary: Certain source lines when debugging with GDB are not
                    found for an executable using gold linker, but are
                    found if regular ld is used instead
           Product: binutils
           Version: 2.30
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gold
          Assignee: ccoutant at gmail dot com
          Reporter: ciro.santilli at gmail dot com
                CC: ian at airs dot com
  Target Milestone: ---

I don't have a fully minimized example, but here is a fully reproducible setup
within a more or less complex build of a big project:
https://github.com/cirosantilli/linux-kernel-module-cheat/issues/109 running in
Ubuntu 18.04.

The project uses partial linking.

The compilation, partial link, and final link commands for one particular file
for which the source lines could not be found was as follows. Do you see
anything suspicious?

compile.tmp.sh

```
g++ \
  -o out/gem5/upstream-master/build/ARM/cpu/o3/cpu.do \
  -c \
  -std=c++11 \
  -pipe \
  -fno-strict-aliasing \
  -Wall \
  -Wundef \
  -Wextra \
  -Wno-sign-compare \
  -Wno-unused-parameter \
  -Werror \
  -Wno-error=deprecated-declarations \
  -Wno-error=deprecated \
  -pthread \
  -fno-builtin-malloc \
  -fno-builtin-calloc \
  -fno-builtin-realloc \
  -fno-builtin-free \
  -DPROTOBUF_INLINE_NOT_IN_HEADERS=0 \
  -ggdb3 \
  -O0 \
  -DNUMBER_BITS_PER_SET=64 \
  -DDEBUG \
  -DTRACING_ON=1 \
  -Iext/pybind11/include \
  -Iout/gem5/upstream-master/build/drampower/src \
  -Iout/gem5/upstream-master/build/nomali/include \
  -Iout/gem5/upstream-master/build/iostream3 \
  -Iout/gem5/upstream-master/build/libfdt \
  -Iout/gem5/upstream-master/build/libelf \
  -Iout/gem5/upstream-master/build/fputils/include \
  -Iinclude \
  -Iext \
  -I/usr/include/python2.7 \
  -I/usr/include/x86_64-linux-gnu/python2.7 \
  -I/usr/include/hdf5/serial \
  -Iext/googletest/googletest/include \
  -Iext/googletest/googlemock/include \
  -Iout/gem5/upstream-master/build/ARM \
  -Iout/gem5/upstream-master/build/ARM/systemc/ext \
  out/gem5/upstream-master/build/ARM/cpu/o3/cpu.cc
```

intermediate-link.tmp.sh

```
g++ \
  -o out/gem5/upstream-master/build/ARM/cpu/o3/lib.do.partial \
  -fuse-ld=gold \
  -r \
  -nostdlib \
  -flinker-output=rel \
  out/gem5/upstream-master/build/ARM/cpu/o3/base_dyn_inst.do \
  out/gem5/upstream-master/build/ARM/cpu/o3/commit.do \
  out/gem5/upstream-master/build/ARM/cpu/o3/cpu.do \
  out/gem5/upstream-master/build/ARM/cpu/o3/deriv.do \
  out/gem5/upstream-master/build/ARM/cpu/o3/decode.do \
  out/gem5/upstream-master/build/ARM/cpu/o3/dyn_inst.do \
  out/gem5/upstream-master/build/ARM/cpu/o3/fetch.do \
  out/gem5/upstream-master/build/ARM/cpu/o3/free_list.do \
  out/gem5/upstream-master/build/ARM/cpu/o3/fu_pool.do \
  out/gem5/upstream-master/build/ARM/cpu/o3/iew.do \
  out/gem5/upstream-master/build/ARM/cpu/o3/inst_queue.do \
  out/gem5/upstream-master/build/ARM/cpu/o3/lsq.do \
  out/gem5/upstream-master/build/ARM/cpu/o3/lsq_unit.do \
  out/gem5/upstream-master/build/ARM/cpu/o3/mem_dep_unit.do \
  out/gem5/upstream-master/build/ARM/cpu/o3/regfile.do \
  out/gem5/upstream-master/build/ARM/cpu/o3/rename.do \
  out/gem5/upstream-master/build/ARM/cpu/o3/rename_map.do \
  out/gem5/upstream-master/build/ARM/cpu/o3/rob.do \
  out/gem5/upstream-master/build/ARM/cpu/o3/scoreboard.do \
  out/gem5/upstream-master/build/ARM/cpu/o3/store_set.do \
  out/gem5/upstream-master/build/ARM/cpu/o3/thread_context.do \
  out/gem5/upstream-master/build/ARM/cpu/o3/checker.do \
  -Lout/gem5/upstream-master/build/drampower \
  -Lout/gem5/upstream-master/build/nomali \
  -Lout/gem5/upstream-master/build/iostream3 \
  -Lout/gem5/upstream-master/build/libfdt \
  -Lout/gem5/upstream-master/build/libelf \
  -Lout/gem5/upstream-master/build/fputils \
  -L/usr/lib/x86_64-linux-gnu/hdf5/serial \
  -Lout/gem5/upstream-master/build/googletest
```

link.tmp.sh

```
g++ \
  -o out/gem5/upstream-master/build/ARM/gem5.debug \
  -fuse-ld=gold \
  -pthread \
  -L/usr/lib/python2.7/config-x86_64-linux-gnu \
  -L/usr/lib \
  -Xlinker \
  -export-dynamic \
  -Wl,-O1 \
  -Wl,-Bsymbolic-functions \
  -z origin \
  -O0 \
  out/gem5/upstream-master/build/ARM/sim/main.do \
  out/gem5/upstream-master/build/ARM/dev/pci/lib.do.partial \
  out/gem5/upstream-master/build/ARM/mem/ruby/network/lib.do.partial \
  out/gem5/upstream-master/build/ARM/dev/ps2/lib.do.partial \
  out/gem5/upstream-master/build/ARM/cpu/o3/probe/lib.do.partial \
  out/gem5/upstream-master/build/ARM/systemc/dt/lib.do.partial \
  out/gem5/upstream-master/build/ARM/mem/protocol/lib.do.partial \
  out/gem5/upstream-master/build/ARM/kern/lib.do.partial \
  out/gem5/upstream-master/build/ARM/cpu/minor/lib.do.partial \
 
out/gem5/upstream-master/build/ARM/mem/ruby/network/fault_model/lib.do.partial
\
  out/gem5/upstream-master/build/ARM/sim/probe/lib.do.partial \
  out/gem5/upstream-master/build/ARM/base/vnc/lib.do.partial \
 
out/gem5/upstream-master/build/ARM/systemc/tlm_core/2/generic_payload/lib.do.partial
\
  out/gem5/upstream-master/build/ARM/arch/arm/lib.do.partial \
  out/gem5/upstream-master/build/ARM/dev/i2c/lib.do.partial \
  out/gem5/upstream-master/build/ARM/mem/ruby/network/garnet2.0/lib.do.partial
\
  out/gem5/upstream-master/build/ARM/mem/ruby/common/lib.do.partial \
  out/gem5/upstream-master/build/ARM/sim/lib.do.partial \
  out/gem5/upstream-master/build/ARM/cpu/testers/directedtest/lib.do.partial \
  out/gem5/upstream-master/build/ARM/systemc/dt/misc/lib.do.partial \
  out/gem5/upstream-master/build/ARM/learning_gem5/part2/lib.do.partial \
  out/gem5/upstream-master/build/ARM/cpu/lib.do.partial \
  out/gem5/upstream-master/build/ARM/cpu/o3/lib.do.partial \
  out/gem5/upstream-master/build/ARM/systemc/dt/fx/lib.do.partial \
  out/gem5/upstream-master/build/ARM/mem/qos/lib.do.partial \
  out/gem5/upstream-master/build/ARM/mem/ruby/slicc_interface/lib.do.partial \
  out/gem5/upstream-master/build/ARM/mem/cache/compressors/lib.do.partial \
  out/gem5/upstream-master/build/ARM/mem/ruby/system/lib.do.partial \
  out/gem5/upstream-master/build/ARM/arch/generic/lib.do.partial \
  out/gem5/upstream-master/build/ARM/python/lib.do.partial \
  out/gem5/upstream-master/build/ARM/mem/cache/prefetch/lib.do.partial \
 
out/gem5/upstream-master/build/ARM/mem/cache/tags/indexing_policies/lib.do.partial
\
  out/gem5/upstream-master/build/ARM/mem/lib.do.partial \
  out/gem5/upstream-master/build/ARM/mem/ruby/profiler/lib.do.partial \
  out/gem5/upstream-master/build/ARM/dev/virtio/lib.do.partial \
  out/gem5/upstream-master/build/ARM/dev/net/lib.do.partial \
  out/gem5/upstream-master/build/ARM/mem/ruby/protocol/lib.do.partial \
  out/gem5/upstream-master/build/ARM/systemc/tlm_core/2/quantum/lib.do.partial
\
  out/gem5/upstream-master/build/ARM/cpu/testers/memtest/lib.do.partial \
  out/gem5/upstream-master/build/ARM/mem/ruby/structures/lib.do.partial \
  out/gem5/upstream-master/build/ARM/systemc/core/lib.do.partial \
  out/gem5/upstream-master/build/ARM/arch/arm/tracers/lib.do.partial \
  out/gem5/upstream-master/build/ARM/systemc/dt/int/lib.do.partial \
  out/gem5/upstream-master/build/ARM/proto/lib.do.partial \
  out/gem5/upstream-master/build/ARM/systemc/dt/bit/lib.do.partial \
  out/gem5/upstream-master/build/ARM/systemc/tlm_bridge/lib.do.partial \
 
out/gem5/upstream-master/build/ARM/cpu/testers/garnet_synthetic_traffic/lib.do.partial
\
  out/gem5/upstream-master/build/ARM/cpu/testers/traffic_gen/lib.do.partial \
  out/gem5/upstream-master/build/ARM/sim/power/lib.do.partial \
  out/gem5/upstream-master/build/ARM/systemc/utils/lib.do.partial \
  out/gem5/upstream-master/build/ARM/base/lib.do.partial \
  out/gem5/upstream-master/build/ARM/mem/cache/tags/lib.do.partial \
  out/gem5/upstream-master/build/ARM/systemc/channel/lib.do.partial \
  out/gem5/upstream-master/build/ARM/dev/arm/lib.do.partial \
  out/gem5/upstream-master/build/ARM/dev/storage/lib.do.partial \
  out/gem5/upstream-master/build/ARM/dev/serial/lib.do.partial \
  out/gem5/upstream-master/build/ARM/cpu/pred/lib.do.partial \
  out/gem5/upstream-master/build/ARM/unittest/lib.do.partial \
  out/gem5/upstream-master/build/ARM/mem/probes/lib.do.partial \
  out/gem5/upstream-master/build/ARM/cpu/trace/lib.do.partial \
  out/gem5/upstream-master/build/ARM/base/filters/lib.do.partial \
  out/gem5/upstream-master/build/ARM/cpu/testers/rubytest/lib.do.partial \
  out/gem5/upstream-master/build/ARM/systemc/tlm_utils/lib.do.partial \
  out/gem5/upstream-master/build/ARM/dev/lib.do.partial \
 
out/gem5/upstream-master/build/ARM/mem/cache/replacement_policies/lib.do.partial
\
  out/gem5/upstream-master/build/ARM/cpu/simple/lib.do.partial \
  out/gem5/upstream-master/build/ARM/mem/cache/lib.do.partial \
  out/gem5/upstream-master/build/ARM/mem/ruby/network/simple/lib.do.partial \
  out/gem5/upstream-master/build/ARM/cpu/simple/probes/lib.do.partial \
  out/gem5/upstream-master/build/ARM/base/date.do \
  -Lout/gem5/upstream-master/build/drampower \
  -Lout/gem5/upstream-master/build/nomali \
  -Lout/gem5/upstream-master/build/iostream3 \
  -Lout/gem5/upstream-master/build/libfdt \
  -Lout/gem5/upstream-master/build/libelf \
  -Lout/gem5/upstream-master/build/fputils \
  -L/usr/lib/x86_64-linux-gnu/hdf5/serial \
  -Lout/gem5/upstream-master/build/googletest \
  -lpython2.7 \
  -lpthread \
  -ldl \
  -lutil \
  -lm \
  -lz \
  -lprotobuf \
  -lrt \
  -ltcmalloc \
  -lhdf5 \
  -lhdf5_cpp \
  -lfputils \
  -lelf \
  -lfdt \
  -liostream3 \
  -lnomali \
  -ldrampower \
  -lpng
```

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