CODEWITHSUNDEEP
visual-studiodumpbin
jww
jww

Reputation: 102406

How to locate and display symbols when using /GL?

We are catching a linker error:

2>cryptlib.lib(x64dll.obj) : error LNK2001: unresolved external symbol "unsigned __int64 * CryptoPP::rdtable::Te" (?Te@rdtable@CryptoPP@@3PA_KA)
2>x64\Output\Debug\cryptest.exe : fatal error LNK1120: 1 unresolved externals

The missing symbol is located in rijndael.cpp, and its its used in x64dll.asm like so:

include ksamd64.inc
EXTERNDEF ?Te@rdtable@CryptoPP@@3PA_KA:FAR
EXTERNDEF ?g_cacheLineSize@CryptoPP@@3IA:FAR
EXTERNDEF ?SHA256_K@CryptoPP@@3QBIB:FAR
...

The source files are compiled with /GL, so we can't use dumpbin /symbols on rijndael.obj to inspect the object files to see what's going on with this configuration. Also see Dumpbin's /SYMBOL documentation and Why is DumpBin telling me there are no COMDATs in my binaries...?.

Microsoft's documentation tells us what we can't use, but it fails to tell us what we should use in this situation.

How do we locate and display symbols in object files when compiling with /GL?

Upvotes: 1

Views: 197

Answers (1)

chwarr
chwarr

Reputation: 7202

If you run LINK /LIB /LTCG /OUT:output.lib rijndael.obj it should produce a static library with actual compiled code. You can then run dumpbin /ALL output.lib to see the symbols. dumpbin /SYMBOLS output.lib does not work for me.

You may need to adjust the LINK line to include additional flags that are usually passed when you link. E.g., /LIBPATH entries and the like.

Upvotes: 0

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