I am investigating how to use gdb for debugging with symbols in external file.
I build a small executable that depend og and equally small shared libaray.
I build the execuablte with cmake producing the following g++ command (I have left out various includes for simplicity):

g++ -DSharedLib_EXPORTS -m64 -Wall -O0 -g -ggdb -std=c++17 -fPIC -MD -MT SharedLib/CMakeFiles/SharedLib.dir/src/SharedLib.cpp.o -MF CMakeFiles/SharedLib.dir/src/SharedLib.cpp.o.d -o CMakeFiles/SharedLib.dir/src/SharedLib.cpp.o -c SharedLib/src/SharedLib.cpp
g++ -m64 -Wall -O0 -g -ggdb -std=c++17 -fPIE -MD -MT Executable/CMakeFiles/Executable.dir/src/Executable.cpp.o -MF CMakeFiles/Executable.dir/src/Executable.cpp.o.d -o CMakeFiles/Executable.dir/src/Executable.cpp.o -c Executable/src/Executable.cpp
g++ -fPIC -m64 -Wall -O0 -g -ggdb -m64 -shared -Wl,-soname,libSharedLib.so -o libSharedLib.so CMakeFiles/SharedLib.dir/src/SharedLib.cpp.o -ldl -lrt -lpthread
g++ -m64 -Wall -O0 -g -ggdb -m64 CMakeFiles/Executable.dir/src/Executable.cpp.o -o Executable libSharedLib.so -lrt -ldl -lpthread

I then copy/strip symbols from both the shared library and the executable with:

objcopy --only-keep-debug Executable symbols/Executable.debug
objcopy --add-gnu-debuglink=symbols/Executable.debug Executable
strip Executable

Inspecting the stripped executable with readelf --string-dump=.gnu_debuglink Executable shows that there is indeed a debug link in the file:

String dump of section '.gnu_debuglink':
  [     0]  Executable.debug
  [    14]  ^�$�

I then end up with two .debug files in the symbols directory, one for the executable and then one for the shared library.

I then fire up gdb to debug Executable (I have deliberately added a segmentation fault in the shared library to test it with gdb):

(gdb) set debug-file-directory symbols
(gdb) file Executable
Reading symbols from Executable...
(No debugging symbols found in Executable)
(gdb)

It feels like it completely ignores the set debug-file-directory symbols?
What am I doing wrong?

Regards
Klaus