Re: [jamboost] Newbie impression of Boost.Build v2

From: Zbynek Winkler (zwin_at_[hidden])
Date: 2003-05-07 04:33:16

Vladimir Prus wrote:

>Zbynek Winkler wrote:
> 
>
>>The <link-runtime> feature
>>can be set to "shared" which finaly gave me the /MD in the command line.
>>Too bad that it is giving me /MD even for debug build (instead of /MDd).
>> 
>>
>
>As I see from msvc.jam, there's <runtime-debugging> option which is separate 
>from regular debuggind option. When <runtime-debugging> is on you'll get 
>/MDd. Do you think /MDd should be present for ordinary debug builds?
>
Yes. The difference between these two (according to the MSDN) is
/MD Multithreaded DLL Defines *_MT* and *_DLL* so that both 
multithread- and DLL-specific versions of the run-time routines are 
selected from the standard .H files. This option also causes the 
compiler to place the library name MSVCRT.LIB into the .OBJ file.
Applications compiled with this option are statically linked to 
MSVCRT.LIB. This library provides a layer of code that allows the linker 
to resolve external references. The actual working code is contained in 
MSVCRT.DLL, which must be available at run time to applications linked 
with MSVCRT.LIB.

/MDd Debug Multithreaded DLL Defines *_DEBUG*, *_MT*, and *_DLL* so 
that debug multithread- and DLL-specific versions of the run-time 
routines are selected from the standard .H files. It also causes the 
compiler to place the library name MSVCRTD.LIB into the .OBJ file.

When looking at the windows headers they make use of the _DEBUG define 
and replace some c-lib function with their debugging counterparts (they 
say that the debug version of the runtime makes some additional checks). 
And also default configurations in new project in MSVC use this for 
debug build so I think it would be good to be consistent with it (I 
would say that it is something that would a developer previously using 
MSVC IDE expect - at least I did :)).

Zbynek

-- 
<zwin at robotika.cz>
http://zw.matfyz.cz/ http://robotika.cz/
Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic