[Mingw-users] cannot create shared DLL due to rpcrt4

[Benno S. <ben...@go...>]

Hi I am trying to compile libgig (an audio sample format library) on win32
using mingw (current stable version)
http://www.linuxsampler.org/downloads.html

out of the box it compiles a static lib and it works fine but I would like
to create a shared DLL which currently does not work.

The problem seems related to the fact that libgig does -lrpcrt4

-----------------------------------
 g++ -DHAVE_CONFIG_H -I. -I. -I.. -pedantic -Wreturn-type -O3 -msse
-march=pentium4 -mfpmath=sse -ffast-math -fomit-frame-pointer -funroll-loops
-MT gig.lo -MD -MP -MF .deps/gig.Tpo -c gig.cpp  -DDLL_EXPORT -DPIC -o
.libs/gig.o
/bin/sh ../libtool --mode=link g++ -pedantic -Wreturn-type -O3 -msse
-march=pentium4 -mfpmath=sse -ffast-math -fomit-frame-pointer
-funroll-loops   -o libgig.la -rpath /usr/local/lib -no-undefined
-version-info 8:0:2  RIFF.lo DLS.lo gig.lo -lrpcrt4

*** Warning: linker path does not have real file for library -lrpcrt4.
*** I have the capability to make that library automatically link in when
*** you link to this library.  But I can only do this if you have a
*** shared version of the library, which you do not appear to have
*** because I did check the linker path looking for a file starting
*** with librpcrt4 and none of the candidates passed a file format test
*** using a file magic. Last file checked:
/mingw/lib/gcc/mingw32/3.4.2/../../..//librpcrt4.a
*** The inter-library dependencies that have been dropped here will be
*** automatically added whenever a program is linked with this library
*** or is declared to -dlopen it.

*** Since this library must not contain undefined symbols,
*** because either the platform does not support them or
*** it was explicitly requested with -no-undefined,
*** libtool will only create a static version of it.
ar cru .libs/libgig.a .libs/RIFF.o .libs/DLS.o .libs/gig.o
ranlib .libs/libgig.a
creating libgig.la
---------------------------------------------------

basically mingw has only this file in the mingw tree
/mingw/lib/librpcrt4.a

are there some files missing (dll import lib ?)

Any idea how  I can tell libtool to compile libgig as  shared DLL
if I remove the -llibrpcrt4  and uncomment the code in libgig that uses
librpcrt4 then libtool
generates a shared DLL so the offending part is most probably this librpcrt4

thanks for any hint,
cheers,
Benno
http://www.linuxsampler.org