Nathan Jennings wrote:
On 7/25/2008 11:50 AM, Graham Bloice wrote:
Gerald Combs wrote:
According to
http://kobyk.wordpress.com/2007/07/20/dynamically-linking-with-msvcrtdll-using-visual-c-2005/
it's possible to use newer versions of Visual C++ to link against the
"classic"
msvcrt.dll instead of msvcr[789]?.dll. This might let us get rid of
some of the
complexity in the current Windows build environment and let us use a
newer
compiler for the official builds.
_______________________________________________
Hmm. The article seems to imply some other complexity as the debug CRT
isn't available so you have to use the one for your compiler toolchain
when debugging. In addition, AFAIK, our CRT problems come from using
compiled binaries from other projects (adns, etc.) that *currently* use
the VS 6 CRT but may switch at any time. I think we'd still have to
ensure all components we use are running with the same CRT thus the
hassles with having to compile them with the CRT of the developers
toolchain.
Thanks for the link to the bug id.
So how does it work now? I mean tracking the CRT for other projects
Wireshark calls into/depends on?
Manually, by fiddling the makefiles and ensuring that the dlls get
rebuilt with the users current toolchain (and crt) for the problematic
cases.
I'm guessing the big ones are GTK/Glib and WinPcap? So do they use MSVC
2005 EE or, at least, the same CRT?
The problem ones are adns and zlib. GTK relies on Glib and Glib
doesn't import any specific CRT. Using depends
(http://www.dependencywalker.com/) can help you identify the linkages.
If I'm reading/understanding Gerald's link to the post and Graham's
message correctly, then you can link/import to any CRT you'd like
regardless of compiler version (i.e. use CRT v8 with VS 2008 or CRT v7
with VS2005)?
I'm not sure about that. The article seems to be talking about getting
around the issue of linking to a specific CRT that isn't installed on
the target machine. By using the tricks described, it would seem that
an app can be made to use whatever CRT is available. I don't think it
gets around the issue of different components of an app using different
versions of CRT, but I'm assuming Gerald's thinking was that we could
make wireshark itself link to the VC 6 CRT on all toolchains, and hence
have no issues with the third part dll's that also do that.
What I'm getting at is Wireshark could potentially call into three
different CRTs if there were two other binary projects and they were
compiled to two different CRT versions, correct?
I.e. Wireshark CRTv8, GTK/Glib CRTv7, WinPcap MSVCRT.
I don't think you can do that within the same app.
--
Regards,
Graham Bloice
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