Package: libllvm6.0-dbgsym
Version: 1:6.0.1-9.2
Backtraces into libllvm6.0 (in either gdb or lldb-6.0) aren't any more
complete with the libllvm6.0-dbgsym package installed than without it:
they have function names but no local variables or source line numbers.
I don't know how long this problem has existed, but the traces in
#852746 + #851371 (LLVM 3.9) and #868745 (LLVM 4.0, non-x86) show that
at least the source line numbers used to work. It also affects libllvm7
version 7-6 (from buster but tested in sid); current libllvm7 doesn't
have a -dbgsym at all due to #913946.
This _isn't_ an exact match for either #851371 or #913946: it doesn't
have either of their error messages, and the -dbgsym package size is
about right (i.e. not simply empty).
$ gdb --args clang++-6.0 -o bug913141 bug913141.cpp -lOpenCL -g
[...various other breakpoints...]
(gdb) break llvm::sys::Wait
Breakpoint 5 at 0x7ffff4925d50 (2 locations)
(gdb) run
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: /usr/bin/clang++-6.0 -o bug913141 bug913141.cpp
-lOpenCL -g
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Breakpoint 5, 0x00007ffff4925d50 in
llvm::sys::Wait(llvm::sys::ProcessInfo const&, unsigned int, bool,
std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*)@plt ()
from /usr/lib/llvm-6.0/bin/../lib/libLLVM-6.0.so.1
(gdb) bt full
#0 0x00007ffff4925d50 in llvm::sys::Wait(llvm::sys::ProcessInfo const&,
unsigned int, bool, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >*)@plt ()
from /usr/lib/llvm-6.0/bin/../lib/libLLVM-6.0.so.1
No symbol table info available.
#1 0x00007ffff4ad4005 in llvm::sys::ExecuteAndWait(llvm::StringRef,
char const**, char const**,
llvm::ArrayRef<llvm::Optional<llvm::StringRef> >, unsigned int, unsigned
int, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*, bool*) ()
from /usr/lib/llvm-6.0/bin/../lib/libLLVM-6.0.so.1
No symbol table info available.
#2 0x0000555555cabb30 in
clang::driver::Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef>
>, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*, bool*) const ()
No symbol table info available.
#3 0x0000555555c8bb17 in
clang::driver::Compilation::ExecuteCommand(clang::driver::Command
const&, clang::driver::Command const*&) const ()
No symbol table info available.
#4 0x0000555555c8c24b in
clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&,
llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&)
const ()
No symbol table info available.
#5 0x0000555555c97239 in
clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&,
llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&) ()
No symbol table info available.
---Type <return> to continue, or q <return> to quit---q
Quit
$ lldb-6.0 -- clang++-6.0 -o bug913141 bug913141.cpp -lOpenCL -g
(lldb) target create "clang++-6.0"
Current executable set to 'clang++-6.0' (x86_64).
(lldb) settings set -- target.run-args "-o" "bug913141" "bug913141.cpp"
"-lOpenCL" "-g"
(lldb) breakpoint set --name llvm::sys::Wait
Breakpoint 1: no locations (pending).
WARNING: Unable to resolve breakpoint to any actual locations.
(lldb) breakpoint set --name llvm::sys::Wait()
Breakpoint 2: no locations (pending).
WARNING: Unable to resolve breakpoint to any actual locations.
(lldb) run
Process 8503 launched: '/usr/bin/clang++-6.0' (x86_64)
1 location added to breakpoint 1
Process 8503 stopped
* thread #1, name = 'clang++-6.0', stop reason = breakpoint 1.1
frame #0: 0x00007ffff4ad1a30
libLLVM-6.0.so.1`llvm::sys::Wait(llvm::sys::ProcessInfo const&, unsigned
int, bool, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*)
libLLVM-6.0.so.1`llvm::sys::Wait:
-> 0x7ffff4ad1a30 <+0>: pushq %r15
0x7ffff4ad1a32 <+2>: movq %rcx, %r15
0x7ffff4ad1a35 <+5>: pushq %r14
0x7ffff4ad1a37 <+7>: movq %rdi, %r14
(lldb) frame variable
(lldb) thread backtrace
* thread #1, name = 'clang++-6.0', stop reason = breakpoint 1.1
* frame #0: 0x00007ffff4ad1a30
libLLVM-6.0.so.1`llvm::sys::Wait(llvm::sys::ProcessInfo const&, unsigned
int, bool, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*)
frame #1: 0x00007ffff4ad4005
libLLVM-6.0.so.1`llvm::sys::ExecuteAndWait(llvm::StringRef, char
const**, char const**, llvm::ArrayRef<llvm::Optional<llvm::StringRef> >,
unsigned int, unsigned int, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >*, bool*) + 181
frame #2: 0x0000555555cabb30
clang++-6.0`clang::driver::Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef>
>, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*, bool*) const + 928
frame #3: 0x0000555555c8bb17
clang++-6.0`clang::driver::Compilation::ExecuteCommand(clang::driver::Command
const&, clang::driver::Command const*&) const + 135
frame #4: 0x0000555555c8c24b
clang++-6.0`clang::driver::Compilation::ExecuteJobs(clang::driver::JobList
const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command
const*> >&) const + 107
frame #5: 0x0000555555c97239
clang++-6.0`clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&,
llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&)
+ 137
frame #6: 0x0000555555987d37 clang++-6.0`main + 7527
frame #7: 0x00007ffff3ab3b17 libc.so.6`__libc_start_main + 231
frame #8: 0x000055555599665a clang++-6.0`_start + 42
