Line number info missing when Windows DLL gets EXCEPTION_ACCESS_VIOLATION

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The DLL was compiled using MSVC toolchain with debug configuration. A .pdb file was generated alongside the .dll file. But it seems line number information is not being made available to Julia’s access violation handler:

Please submit a bug report with steps to reproduce this fault, and any error messages that follow (in their entirety). Thanks.
Exception: EXCEPTION_ACCESS_VIOLATION at 0x7fffc435ed0e -- testCPPClient at C:\Users\kirby\MyDrive\Documents\TWS_API\build\Debug\TestCppClientLib.dll (unknown line)
in expression starting at none:0
testCPPClient at C:\Users\kirby\MyDrive\Documents\TWS_API\build\Debug\TestCppClientLib.dll (unknown line)
testCPPClient at C:\Users\kirby\MyDrive\Documents\TWS_API\build\Debug\TestCppClientLib.dll (unknown line)
testCPPClient at C:\Users\kirby\MyDrive\Documents\TWS_API\build\Debug\TestCppClientLib.dll (unknown line)
testCPPClient at C:\Users\kirby\MyDrive\Documents\TWS_API\build\Debug\TestCppClientLib.dll (unknown line)
testCPPClient at C:\Users\kirby\MyDrive\Documents\TWS_API\build\Debug\TestCppClientLib.dll (unknown line)
testCPPClient at C:\Users\kirby\MyDrive\Documents\TWS_API\build\Debug\TestCppClientLib.dll (unknown line)
testCPPClient at C:\Users\kirby\MyDrive\Documents\TWS_API\build\Debug\TestCppClientLib.dll (unknown line)
reqHistoricalData at C:\Users\kirby\.julia\packages\CxxWrap\VnssN\src\CxxWrap.jl:624
unknown function (ip: 0000027df9f3910a)
send at c:\Users\kirby\MyDrive\Documents\fourthwave\pkg\TwsApi\src\eventqueue.jl:217
unknown function (ip: 0000027df9f38c36)
receive at c:\Users\kirby\MyDrive\Documents\fourthwave\pkg\TwsApi\src\eventqueue.jl:267
unknown function (ip: 0000027df9f32142)
#6 at c:\Users\kirby\MyDrive\Documents\fourthwave\pkg\TwsApi\src\eventqueue.jl:302
#627 at .\channels.jl:134
unknown function (ip: 0000027df9f279f3)
jl_apply at C:/workdir/src\julia.h:1879 [inlined]
start_task at C:/workdir/src\task.c:1092
Allocations: 8437371 (Pool: 8432131; Big: 5240); GC: 12

I see that other people who have used DLL’s do get line number info. I’m using Julia 1.9.2 and CxxWrap.jl. Any pointers on how to report the line numbers?

Thanks!

2

Have you tried compiling with MinGW? For Visual Studio see the following on how to set that up.

Also you can try Clang:

1 Like
3

Haven’t tried that yet. I do see some people have had their DLL’s with MinGW environment and they got the line numbers. I wonder if it’s a MSVC compiler flag that happened to go with the MinGW environment? Thanks for your tip.