[Qt-interest] Question about license requirement on redistributing libgcc shared library

[Koji Ishihara]

Hello,

Please help me to understand about the license requirement on 
redistributing libgcc shared library, to be specific, the dll file 
"libgcc_s_dw2-1.dll".  I am using Qt SDK 4.6.1 for Windows(MinGW) 
under the LGPL, and that dll file is placed in the folders 
"2010.01\mingw\bin" and "2010.01\qt\bin" by default.
I am going to distribute a package that consists of the files:
  - Qt application(.exe) file developing, under a proprietary license
  - "Qt*.dll" files, under the LGPL v2.1
  - "mingwm10.dll" of MinGW runtime, public domain
  - "libgcc_s_dw2-1.dll", ...

I understand that "GCC Runtime Library Exception Version 3.1" is 
applied as license of libgcc, based on the following sentence 
described in the source files of libgcc:
  "Under Section 7 of GPL version 3, you are granted additional
   permissions described in the GCC Runtime Library Exception, version
   3.1, as published by the Free Software Foundation."

Looking into "GCC Runtime Library Exception v3.1" and "rationale 
document and FAQ" (see http://www.gnu.org/licenses/gcc-exception.html), 
it seems for me that redistributing "libgcc_s_dw2-1.dll" is permitted 
and no obligation is required if the following condition is met:
  - All files linked with libgcc are "Independent Module" for libgcc.
    and 
  - All "Target Code" was generated by "Eligible Compilation Processes".

So my questions in brief are:
  - In my understanding, redistributing "libgcc_s_dw2-1.dll" is 
    granted without any obligation such as providing its source code 
    and copyright/legal notice, if the above condition is met.
    Is this correct?
  - All "Qt*.dll" files in Qt SDK are "Independent Module" for libgcc?
  (Please refer to the above link for definition of term.)

Any help will be appreciated, since I am not very familiar with GPL 
licenses.

Regards,
Koji Ishihara