[GitHub] [arrow] wesm commented on pull request #8158: ARROW-7215: [C++][Gandiva] Implement castVARCHAR(numeric_type) functions

[GitBox <gi...@apache.org>]

wesm commented on pull request #8158:
URL: https://github.com/apache/arrow/pull/8158#issuecomment-705056610


   ```
   INK: command "C:\PROGRA~2\MIB055~1\2017\COMMUN~1\VC\Tools\MSVC\1416~1.270\bin\Hostx64\x64\link.exe /nologo @CMakeFiles\gandiva-internals-test.rsp /out:release\gandiva-internals-test.exe /implib:release\gandiva-internals-test.lib /pdb:release\gandiva-internals-test.pdb /version:0.0 /machine:x64 /NODEFAULTLIB:LIBCMT /INCREMENTAL:NO /subsystem:console /MANIFEST /MANIFESTFILE:release\gandiva-internals-test.exe.manifest" failed (exit code 1120) with the following output:
   LLVMSupport.lib(regcomp.c.obj) : MSIL .netmodule or module compiled with /GL found; restarting link with /LTCG; add /LTCG to the link command line to improve linker performance
   unity_2_cxx.cxx.obj : error LNK2001: unresolved external symbol gdv_fn_castVARCHAR_int32_int64
   unity_2_cxx.cxx.obj : error LNK2001: unresolved external symbol gdv_fn_castVARCHAR_int64_int64
   unity_2_cxx.cxx.obj : error LNK2001: unresolved external symbol gdv_fn_castVARCHAR_float32_int64
   unity_2_cxx.cxx.obj : error LNK2001: unresolved external symbol gdv_fn_castVARCHAR_float64_int64
   release\gandiva-internals-test.exe : fatal error LNK1120: 4 unresolved externals
   ```
   
   Either you need to statically-link these symbols (or include them with the .cc files / object code for the unit test) or add an appropriate export annotation for the functions so they will link from the DLL


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