Unable to compile - Judy unresolved external symbols
enderdrag64 opened this issue · comments
I've spent most of my day today trying to compile this and failing. I'm using windows 10, visual studio 2022. It doesn't matter whether I use scons or not, the end result is the same - it compiles fine, but the visual studio linker is unable to find any of the symbols in judy.lib
I've attached the errors, as well as the output of running dumpbin on the lib file. Clearly the symbols are there, I'm really not sure what the problem is.
I'm guessing that you compiled judy yourself (using build.bat). Try this:
Put judy.def from judy.zip into judy-1.0.5\src (where build.bat is located).
Edit file build.bat and add parameter /DEF:judy.def to the link commands at the end of the file.
Compile it again.
I'm guessing that you compiled judy yourself (using build.bat). Try this: Put judy.def from judy.zip into judy-1.0.5\src (where build.bat is located). Edit file build.bat and add parameter
/DEF:judy.defto thelinkcommands at the end of the file. Compile it again.
Okay I tried doing this, if I link with the DEF added then it generates a much smaller lib file (11kb instead of 293kb) that has no export symbols at all except for judy_NULL_THUNK_DATA
It's worth noting that adding the /DEF:judy.def part wasn't enough, that gave a bunch of errors about "unrecognized option /LIB", I had to change the last "link" into a "lib" and then remove the /LIB option.
I don't have visual studio 2022, I'm testing it on older version where link still supports option /LIB, but that's just a minor issue.
My generated .lib file is also small (11 kB), but has the exported symbols:
dumpbin /exports judy.lib
Microsoft (R) COFF/PE Dumper Version 10.00.40219.01
Copyright (C) Microsoft Corporation. All rights reserved.
Dump of file judy.lib
File Type: LIBRARY
Exports
ordinal name
_Judy1ByCount
_Judy1Count
_Judy1First
_Judy1FirstEmpty
_Judy1FreeArray
_Judy1Last
_Judy1LastEmpty
_Judy1MallocSizes
_Judy1MemActive
_Judy1MemUsed
_Judy1Next
_Judy1NextEmpty
_Judy1Prev
_Judy1PrevEmpty
_Judy1Set
_Judy1SetArray
_Judy1Test
_Judy1Unset
_JudyFree
_JudyHSDel
_JudyHSFreeArray
_JudyHSGet
_JudyHSIns
_JudyLByCount
_JudyLCount
_JudyLDel
_JudyLFirst
_JudyLFirstEmpty
_JudyLFreeArray
_JudyLGet
_JudyLIns
_JudyLInsArray
_JudyLLast
_JudyLLastEmpty
_JudyLMallocSizes
_JudyLMemActive
_JudyLMemUsed
_JudyLNext
_JudyLNextEmpty
_JudyLPrev
_JudyLPrevEmpty
_JudyMalloc
_JudyMallocVirtual
_JudySLDel
_JudySLFirst
_JudySLFreeArray
_JudySLGet
_JudySLIns
_JudySLLast
_JudySLNext
_JudySLPrev
Summary
BA .debug$S
14 .idata$2
14 .idata$3
4 .idata$4
4 .idata$5
A .idata$6
What's your output of dumpbin /exports judy.lib ?
It looks like this:
Microsoft (R) COFF/PE Dumper Version 14.39.33523.0
Copyright (C) Microsoft Corporation. All rights reserved.Dump of file Judy.lib
File Type: LIBRARY
COFF SYMBOL TABLE
000 010175CA ABS notype Static | @comp.id
001 00000000 SECT2 notype External | __IMPORT_DESCRIPTOR_judy
002 C0000040 SECT2 notype Section | .idata$2
003 00000000 SECT3 notype Static | .idata$6
004 C0000040 UNDEF notype Section | .idata$4
005 C0000040 UNDEF notype Section | .idata$5
006 00000000 UNDEF notype External | __NULL_IMPORT_DESCRIPTOR
007 00000000 UNDEF notype External | �judy_NULL_THUNK_DATAString Table Size = 0x4C bytes
COFF SYMBOL TABLE
000 010175CA ABS notype Static | @comp.id
001 00000000 SECT2 notype External | __NULL_IMPORT_DESCRIPTORString Table Size = 0x1D bytes
COFF SYMBOL TABLE
000 010175CA ABS notype Static | @comp.id
001 00000000 SECT2 notype External | �judy_NULL_THUNK_DATAString Table Size = 0x1A bytes
Summary
BA .debug$S 14 .idata$2 14 .idata$3 4 .idata$4 4 .idata$5 A .idata$6
That looks like the output of dumpbin /symbols judy.lib. Can you check the output of dumpbin /exports judy.lib ?
Ahh good catch. With /exports it looks the same as yours. I still get unresolved external symbols when trying to link with it though
I'm not sure I can help you any further. I made a test program and it linked with judy.lib without any problems.
I'm not sure I can help you any further. I made a test program and it linked with judy.lib without any problems.
May I ask what version of Visual Studio you're using? I may just restart with that
May I ask what you are trying to achieve ?
I'm not sure this project works with compilers other than gcc/clang.
And if you can't compile it, are you sure you have the skills/knowledge to do something with it ?
I'm not sure this project works with compilers other than gcc/clang.
Then why is your SConstruct script built to use Visual Studio?
That's how scons works. I didn't do anything specific for Visual Studio.
I'm not stopping you from using Visual studio, but i don't use it so don't expect much help.
Okay so I switched to gcc inside msys2 and I tried building (gcc *.c -lJudy -ludis86) and I'm still getting undefined references involving Judy, even after rebuilding it from scratch with gcc too.
I tried compiling it in msys2 and I fixed some compilation warnings. With 32-bit version there were no problems with building. With 64-bit version there were a lot of compiler warning when compiling Judy, but when I fixed those, there were no problems with building.
I finally managed to build SR successfully!
Using the official judy 1.05 release from SourceForge like I had been was a lost cause, but I found this fork over at https://github.com/dlmiles/libjudy that has fixes specifically to fix compatibility with msys. After building and installing that version I was able to link against it successfully.
I'd recommend updating your documentation to clarify that you should compile with msys/gcc instead of scons/visual studio, and perhaps link to the working judy fork