Bug 1377697

Summary: gcc debug info is broken with -gsplit-dwarf -g3
Product: [Fedora] Fedora Reporter: Serge Pavlovsky <pal666>
Component: gccAssignee: Jakub Jelinek <jakub>
Status: CLOSED EOL QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 24CC: davejohansen, jakub, jwakely, law, mpolacek
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Hardware: x86_64   
OS: Linux   
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Last Closed: 2017-08-08 17:32:56 UTC Type: Bug
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Description Serge Pavlovsky 2016-09-20 12:06:20 UTC
Description of problem:

debugger says DW_FORM_strp pointing outside of .debug_str section [in module /tmp/split-dwarf-test/a.dwo]
and can't install breakpoint on main etc

Version-Release number of selected component (if applicable):
g++ (GCC) 6.1.1 20160621 (Red Hat 6.1.1-3)

How reproducible:

reproduction depends on file path among other things, if it will not reproduce, try in the same directory as me

Steps to Reproduce:

1. echo 'int main(){}' > a.cpp && g++ -std=c++14 -g3 -gsplit-dwarf a.cpp -o a && gdb a

Actual results:

GNU gdb (GDB) Fedora 7.11.1-75.fc24
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-redhat-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...done.
DW_FORM_strp pointing outside of .debug_str section [in module /tmp/split-dwarf-test/a.dwo]
(gdb) start
DW_FORM_strp pointing outside of .debug_str section [in module /tmp/split-dwarf-test/a.dwo]
(gdb)

Expected results:

$ echo 'int main(){}' > a.cpp && g++ -std=c++14 -g -gsplit-dwarf a.cpp -o a && gdb a
GNU gdb (GDB) Fedora 7.11.1-75.fc24
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-redhat-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...done.
(gdb) start
Temporary breakpoint 1 at 0x40059a: file a.cpp, line 1.
Starting program: /tmp/split-dwarf-test/a

Temporary breakpoint 1, main () at a.cpp:1
1       int main(){}
(gdb)


Additional info:

removing -std=c++14 fixes this particular test (it will break on other parameters or on other source content), changing -g3 to -g fixes this issue permanently

Comment 1 Jakub Jelinek 2016-09-20 12:18:40 UTC
Better don't use -gsplit-dwarf, I think it isn't generally useful unless you link hundreds of thousands or more object files.

Comment 2 Fedora End Of Life 2017-07-25 23:09:25 UTC
This message is a reminder that Fedora 24 is nearing its end of life.
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Comment 3 Fedora End Of Life 2017-08-08 17:32:56 UTC
Fedora 24 changed to end-of-life (EOL) status on 2017-08-08. Fedora 24 is
no longer maintained, which means that it will not receive any further
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