Bug#851371: libllvm3.9-dbg: lots of "Could not find DWO" and "in read in psymtab, but not in symtab" warnings

[Rebecca N. Palmer]

Package: libllvm3.9-dbg
Version: 1:3.9.1-2
Severity: minor

This -dbg package produces enough warnings that backtraces become 
difficult to read:

$ sudo apt-get install beignet-opencl-icd beignet-dev libllvm3.9-dbg
$ OCL_STRICT_CONFORMANCE=0 gdb --args /usr/lib/x*/beignet/utest_run -c 
vload_test_uchar
[...standard notice...]
(gdb) run
Starting program: /usr/lib/x86_64-linux-gnu/beignet/utest_run -c 
vload_test_uchar
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
warning: Could not find DWO CU 
CMakeFiles/LLVMSupport.dir/APFloat.cpp.dwo(0x7c87b0db7d3d4058) 
referenced by CU at offset 0x0 [in module 
/usr/lib/debug/.build-id/ba/46ea8b237c3239edf83c2033c3cd7ab15c0452.debug]
warning: Could not find DWO CU 
CMakeFiles/LLVMSupport.dir/APInt.cpp.dwo(0xa717a8523be60fba) referenced 
by CU at offset 0x34 [in module 
/usr/lib/debug/.build-id/ba/46ea8b237c3239edf83c2033c3cd7ab15c0452.debug]
warning: Could not find DWO CU 
CMakeFiles/LLVMSupport.dir/APSInt.cpp.dwo(0x327a9b36dfe37c55) referenced 
by CU at offset 0x68 [in module 
/usr/lib/debug/.build-id/ba/46ea8b237c3239edf83c2033c3cd7ab15c0452.debug]
[...many more like this...]
vload_test_uchar()^Cwarning: Could not find DWO CU 
CMakeFiles/LLVMCore.dir/Value.cpp.dwo(0xfbc42bc69776deb) referenced by 
CU at offset 0x9949 [in module 
/usr/lib/debug/.build-id/ba/46ea8b237c3239edf83c2033c3cd7ab15c0452.debug]

Program received signal SIGINT, Interrupt.
0x00007ffff07ff744 in llvm::Value::getContext() const ()
     at /build/llvm-toolchain-3.9-3.9.1/lib/IR/Value.cpp:646
646	/build/llvm-toolchain-3.9-3.9.1/lib/IR/Value.cpp: No such file or 
directory.
(gdb) bt
#0  0x00007ffff07ff744 in llvm::Value::getContext() const ()
     at /build/llvm-toolchain-3.9-3.9.1/lib/IR/Value.cpp:646
#1  0x00007ffff08012dc in llvm::ValueHandleBase::RemoveFromUseList() ()
     at /build/llvm-toolchain-3.9-3.9.1/lib/IR/Value.cpp:755
warning: Could not find DWO CU 
CMakeFiles/LLVMAnalysis.dir/ScalarEvolution.cpp.dwo(0xdbfacc7b5eb8dc7d) 
referenced by CU at offset 0xf241 [in module 
/usr/lib/debug/.build-id/ba/46ea8b237c3239edf83c2033c3cd7ab15c0452.debug]
warning: (Internal error: pc 0x7ffff124ade0 in read in psymtab, but not 
in symtab.)

warning: (Internal error: pc 0x7ffff124ab30 in read in psymtab, but not 
in symtab.)

warning: (Internal error: pc 0x7ffff124ade0 in read in psymtab, but not 
in symtab.)

warning: (Internal error: pc 0x7ffff124ade0 in read in psymtab, but not 
in symtab.)

warning: (Internal error: pc 0x7ffff124ade0 in read in psymtab, but not 
in symtab.)
[...many more like this...]