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Message:	[quote=ThomasWatts] 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. [/quote] Message to be posted (in English, please).
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Posted by

Nick Gammon Australia (18,770 posts)

bio Forum Administrator

Date

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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Posted by

ThomasWatts USA (66 posts)

bio

Date

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 (18,770 posts) bio Forum Administrator

Date 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)

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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