Thank you for your answer.

My problem is that in my code I use standard libraries from GCC (libquadmath, libgcc, etc), which were compiled together with GCC with link to MSVCR.
I guess "specs" file cannot save the situation. Full re-compilation is needed (?).

Sorry for unclear explanation in my first message. I did test "specs" before writing to the mail-list.

On Tue, Oct 16, 2012 at 8:50 PM, Earnie Boyd <earnie@users.sourceforge.net> wrote:
On Tue, Oct 16, 2012 at 4:54 AM, Pavel Holoborodko wrote:
> Hello,
>
> I need to use DLLs generated by MinGW/GCC 4.7.0 in Visual Studio 2010
> application.
> As expected, different runtimes living in one process lead to unpredictable
> results.
>

And this result is documented on MSDN.

> In connection with this, I would greatly appreciate any help on how to build
> MinGW/GCC (4.7.0) with initial support of MSVCR100 runtime (instead of
> msvcr.dll).
>

Does LIBS=-lmsvcr100 not work for you?

> Now, using "specs" file I can force GCC to produce DLL with MSVCR100.
> However, I have to recompile GCC from the scratch, so that  GCC-specific
> libraries also rely on MSVCR100.
> (I use them in my code, like libquadmath, etc.).
>

No you do not need build GCC just for a new specs file.  You can state
the specs file location on the command line (-specs=<file>) or you can
place the specs file where GCC expects to find it.  For MinGW assuming
you have installed in C:\MinGW, you are using MSYS with C:/MinGW
mapped to /mingw and your GCC version is 4.7.0 then you place the
specs in the /mingw/lib/gcc/mingw32/4.7.0 directory.

To get the original specs file you can use -dumpspecs option to gcc
and redirect the output to a file.

> Any pointers/references/step-by-step guides on how to re-compile MinGW/GCC
> 4.7.x with MSVCR100 would be much appreciated.
> (Or at least detailed manual on how to build GCC for MinGW.)
>

You don't need to so I won't give those here.  The source package
comes with a build process but there are a number of dependency
libraries you'll need.  We supply those as well, you just need to
install the -dev package for them.

--
Earnie
-- https://sites.google.com/site/earnieboyd

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