[CMake] No debugging symbols found when using -DCMAKE_BUILD_TYPE=Debug

[Esch Nigma]

Hello all,

I just registered to this mailing list, my apologies if this was already discussed.

I'm experiencing an issue where I'm unable to debug my code when the project is 
configured with CMake. When running gdb on the final binary, it mentions that no 
debugging symbols are found. I tried this via the command line, and through QT Creator.

After asking on StackOverflow, I was given a workaround - Cmake fails to figure out the 
compiler identification automatically. Adding -DCMAKE_CXX_COMPILER_ID:STRING=GNU 
makes it all work just fine. However, it should still detect it automatically.

I've built an empty Hello world to display this:

    [eschnigma at manjaro quicktest]$ cat main.cpp  #include<iostream> using namespace 
std; 

int main(){    cout << "Hello there"; } 


When I build into a subdirectory and try to debug, this is the output:

   [eschnigma at manjaro build]$ cmake .. -DCMAKE_BUILD_TYPE:STRING="Debug" 

*Scanning dependencies of target qtest* 
[100%] Building CXX object CMakeFiles/qtest.dir/main.cpp.o 
*Linking CXX executable qtest* 
[100%] Built target qtest 


   [eschnigma at manjaro build]$ gdb qtest  GNU gdb (GDB) 7.11 Copyright (C) 2016 Free 
Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/
licenses/gpl.html> This is free software: you are free to change and redistribute it. There is 
NO WARRANTY, to the extent permitted by law.  Type "show copying" and "show warranty" 
for details.                                                                                                                                         This 
GDB was configured as "x86_64-pc-linux-gnu".                                                                                                                        
Type "show configuration" for configuration details. For bug reporting instructions, please 
see: <http://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other 
documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. 
For help, type "help". Type "apropos word" to search for commands related to "word"... 
Reading symbols from qtest...(no debugging symbols found)...done. (gdb)

However - when I compile manually, it works fine:

   [eschnigma at manjaro quicktest]$ c++ -g main.cpp     [eschnigma at manjaro quicktest]$ 
gdb a.out GNU gdb (GDB) 7.11 Copyright (C) 2016 Free Software Foundation, Inc. License 
GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free 
software: you are free to change and redistribute it. There is NO WARRANTY, to the extent 
permitted by law.  Type "show copying" and "show warranty" for details. This GDB was 
configured as "x86_64-pc-linux-gnu". Type "show configuration" for configuration details. 
For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>. 
Find the GDB manual and other documentation resources online at: <http://www.gnu.org/
software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for 
commands related to "word"... Reading symbols from a.out...done. (gdb) quit


I have tested this on cmake version 2.8.11.2 and 3.5.2.
This problem started happening a few days ago, on two different machines, both running 
Manjaro Linux.

I'll be able to continue coding for now, but I wanted to report on this anyway - as far as I 
know, it should all be automatic.

Thanks,
Esch


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