[Live-devel] cross compiled Live555 libs

[Yuri Timenkov]

Hi,

You should know that VC and MinGW use incompatible library format. 
FFMpeg is C library this allows interoperability between VC and MinGW 
(as it is with kernel32.dll and ntdll.dll). Moreover AFAIK FFMpeg 
doesn't support VC (neither has plans to).

With C++ things different. As I mentioned, there is a lot of thing to 
take care of (name mangling, vtables, templates, inlines, exceptions and 
etc.), and there is a big chance that C++ objects built with different 
compilers will crash if used in same binary. To prevent this (along with 
other reasons) MinGW and VC use different mangling schemes. Even if they 
had same library format (or if you built a dll and generate exports from 
it) you can't link VC app with MinGW liveMedia.

So if you want to build app in VC and link it with liveMedia, you should 
build liveMedia also with VC. Or you may just add all liveMedia files 
into your App's project or solution.

Recently there was discussion to move liveMedia to CMake to allow 
generating native build systems on different platforms, but this 
initiative is now suspended (as I suppose there are not so many people 
interested in it).

Regards,
Yuri

On 14.12.2010 0:07, Ke Yu wrote:
> I had built the Live555 libs with mingw tools in UBuntu successfully
> following instructions:
> 1). genMakefiles config.mingw
> 2). make
> The reason for cross compiling above is I have other libraries built
> this way (namely, FFMpeg). I've built an app with those FFMpeg libs in
> Visual C++ 2008. The app works fine. Now, I need to also use the
> live555 libraries built above in this same project. However, when I
> tried to link the live555 libs, the Visual Studio compiler gave me
> fatal link error: "libliveMedia.a: invalid or corrupt file". The host
> OS is Windows 7.
>
> How should I fix this problem?
>
> Thanks!
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