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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang on linux produces .pdb for windows target, but windbg won't load it"
href="https://bugs.llvm.org/show_bug.cgi?id=34303">34303</a>
</td>
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<tr>
<th>Summary</th>
<td>clang on linux produces .pdb for windows target, but windbg won't load it
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>5.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>rennieallen@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<pre>Build a hello world executable like so:
$ clang -v -g -gcodeview -target x86_64-pc-windows-msvc18.0.0 -isystem
/home/rallen/clang/5.0/build/windows/include -isystem
/home/rallen/clang/5.0/build/windows/kits/10.0.10586/noarch/include -L
/home/rallen/clang/5.0/build/windows/amd64 -L
/home/rallen/clang/5.0/build/windows/kits/10.0.10586/win32-x86_64/lib
-fuse-ld=lld -o foo.exe foo.c
Result:
foo.exe and foo.pdb produced.
Run llvm-pdbutil on foo.pdb:
$ llvm-pdbutil dump -summary foo.pdb
Summary
============================================================
Block Size: 4096
Number of blocks: 1016
Number of streams: 204
Signature: 1503524810
Age: 1
GUID: {6149EB78-991F-EFD5-2DBE-E79C367E29D5}
Features: 0x1
Has Debug Info: true
Has Types: true
Has IDs: true
Has Globals: false
Has Publics: true
Is incrementally linked: false
Has conflicting types: false
Is stripped: false
So far, nothing looks amiss.
Copy foo.exe+foo.pdb to a windows volume (/mnt/c/temp) then use WinDbg to load
foo.exe.
CommandLine: C:\temp\foo.exe
Starting directory: c:\temp
DBGHELP: Symbol Search Path:
cache*c:\temp;srv*<a href="https://msdl.microsoft.com/download/symbols">https://msdl.microsoft.com/download/symbols</a>
************* Symbol Path validation summary **************
Response Time (ms) Location
Deferred cache*c:\temp
Deferred
srv*<a href="https://msdl.microsoft.com/download/symbols">https://msdl.microsoft.com/download/symbols</a>
DBGHELP: Symbol Search Path:
cache*c:\temp;srv*<a href="https://msdl.microsoft.com/download/symbols">https://msdl.microsoft.com/download/symbols</a>
DBGHELP: Symbol Search Path:
cache*c:\temp;srv*<a href="https://msdl.microsoft.com/download/symbols">https://msdl.microsoft.com/download/symbols</a>
Symbol search path is:
cache*c:\temp;srv*<a href="https://msdl.microsoft.com/download/symbols">https://msdl.microsoft.com/download/symbols</a>
Executable search path is:
ModLoad: 00007ff7`35240000 00007ff7`35264400 foo.exe
ModLoad: 00007ff8`09680000 00007ff8`0985b000 ntdll.dll
ModLoad: 00007ff8`078c0000 00007ff8`0796e000 C:\WINDOWS\System32\KERNEL32.DLL
ModLoad: 00007ff8`06090000 00007ff8`062d9000
C:\WINDOWS\System32\KERNELBASE.dll
ModLoad: 00007ff8`06c60000 00007ff8`06d01000 C:\WINDOWS\System32\ADVAPI32.dll
ModLoad: 00007ff8`06bc0000 00007ff8`06c5d000 C:\WINDOWS\System32\msvcrt.dll
ModLoad: 00007ff8`07fd0000 00007ff8`08029000 C:\WINDOWS\System32\sechost.dll
ModLoad: 00007ff8`07b70000 00007ff8`07c95000 C:\WINDOWS\System32\RPCRT4.dll
ModLoad: 00007ff8`05580000 00007ff8`0558b000
C:\WINDOWS\SYSTEM32\CRYPTBASE.DLL
ModLoad: 00007ff8`06b50000 00007ff8`06bba000
C:\WINDOWS\System32\bcryptPrimitives.dll
Check the sympath:
0:000> .sympath
Symbol search path is:
cache*c:\temp;srv*<a href="https://msdl.microsoft.com/download/symbols">https://msdl.microsoft.com/download/symbols</a>
Expanded Symbol search path is:
cache*c:\temp;srv*<a href="https://msdl.microsoft.com/download/symbols">https://msdl.microsoft.com/download/symbols</a>
************* Symbol Path validation summary **************
Response Time (ms) Location
Deferred cache*c:\temp
Deferred
srv*<a href="https://msdl.microsoft.com/download/symbols">https://msdl.microsoft.com/download/symbols</a>
Module list:
:000> lm
start end module name
00007ff7`35240000 00007ff7`35264400 foo T (no symbols)
00007ff8`05580000 00007ff8`0558b000 CRYPTBASE (deferred)
00007ff8`06090000 00007ff8`062d9000 KERNELBASE (deferred)
00007ff8`06b50000 00007ff8`06bba000 bcryptPrimitives (deferred)
00007ff8`06bc0000 00007ff8`06c5d000 msvcrt (deferred)
00007ff8`06c60000 00007ff8`06d01000 ADVAPI32 (deferred)
00007ff8`078c0000 00007ff8`0796e000 KERNEL32 (deferred)
00007ff8`07b70000 00007ff8`07c95000 RPCRT4 (deferred)
00007ff8`07fd0000 00007ff8`08029000 sechost (deferred)
00007ff8`09680000 00007ff8`0985b000 ntdll (pdb symbols)
c:\temp\ntdll.pdb\41D57AE3B178CDF490C0B78265127E9B1\ntdll.pdb
Now attempt to load symbols for foo:
0:000> ld foo
DBGHELP: unrecognized OMF sig: 5a4d MZ*** WARNING: Unable to verify timestamp
for foo.exe
*** ERROR: Module load completed but symbols could not be loaded for foo.exe
DBGHELP: foo - no symbols loaded
Symbols loaded for foo
The issue appears to be the unrecognized OMF sig.</pre>
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