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Compile me crazy

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Posted by ThomasWatts   USA  (66 posts)  [Biography] bio
Date Wed 26 Dec 2007 01:52 AM (UTC)  [ quote  ]

Amended on Wed 26 Dec 2007 01:53 AM (UTC) by ThomasWatts

Message
My problem is the following:
I compile Lua with g++ and I must compile SMAUG with g++ as well.
If I compile Lua with gcc, then I have to use gcc with SMAUG.
Zlib on the other hand can only compile with gcc, but links fine either way.
If I try to compile Lua with g++ and SMAUG with gcc I get undefined reference errors to lua functions, ie. lua_pushnil.

Does anyone else have this problem? Is this just a very minor concern and I'm being obsessive?

Also, Merry Christmas those in the USA
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Posted by Nick Gammon   Australia  (18,797 posts)  [Biography] bio   Forum Administrator
Date Reply #1 on Wed 26 Dec 2007 02:34 AM (UTC)  [ quote  ]
Message
When you include the Lua .h files you have to put extern around them like this:


extern "C" {
  #include "lua.h"
// and any other Lua files
  }
- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by ThomasWatts   USA  (66 posts)  [Biography] bio
Date Reply #2 on Thu 27 Dec 2007 04:10 AM (UTC)  [ quote  ]
Message
Just to reply to this, I was originally perplexed as to why C++ code could call external(dll) C code, but not the other way around.
C++ mangles function names to allow for templates which C code does not understand.
I just decided to compile both in C++ which works fine.
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Posted by Nick Gammon   Australia  (18,797 posts)  [Biography] bio   Forum Administrator
Date Reply #3 on Thu 27 Dec 2007 05:27 AM (UTC)  [ quote  ]
Message
Yes, exactly, and when you use ' extern "c" ' it tells the linker that this particular DLL does not have mangled names.
- Nick Gammon

www.gammon.com.au, www.mushclient.com
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