Okay, I got around it by simply putting the entire header file inclusion in an extern "C"{} . Now it works!
Thanks again for your help, Ramya ________________________________________ From: l4-hackers [l4-hackers-boun...@os.inf.tu-dresden.de] on behalf of Masti Ramya Jayaram [rma...@inf.ethz.ch] Sent: 01 September 2014 16:53 To: Martin Küttler; l4-hackers@os.inf.tu-dresden.de Subject: RE: New package linking fails hey Martin, I had not done that and I tried it. In main.cc I declared the function as extern "C" int self_test(int); I hope that is what you meant. However, I get the following error: test1.h:115: error: previous declaration of ‘int self_test(int)’ with ‘C++’ linkage /l4/pkg/test/server/src/main.cc:46: error: conflicts with new declaration with ‘C’ linkage best, Ramya ________________________________________ From: l4-hackers [l4-hackers-boun...@os.inf.tu-dresden.de] on behalf of Martin Küttler [martin.kuett...@gmail.com] Sent: 01 September 2014 16:45 To: l4-hackers@os.inf.tu-dresden.de Subject: Re: New package linking fails On 09/01/2014 04:28 PM, Masti Ramya Jayaram wrote: > Dear all, > > I am trying to create a new package under l4/pkg. The linking of the package > fails and it has to do with the linker path but I am not sure how to fix it. > Here are the details. > > Package structure: (relevant parts) > > l4/pkg/test/server/src/main.cc > l4/pkg/test/server/src/folder1/test1.c > l4/pkg/test/include/test1.h > > l4/pkg/test/server/src/Makefile > > PKGDIR ?= ../.. > L4DIR ?= $(PKGDIR)/../.. > > TARGET = $(PKGNAME) > > # list requirements of your program here > REQUIRES_LIBS = libsigma0 libirq l4util l4re_c-util > > # list your .c or .cc files here > SRC_C = folder1/test1.c > SRC_CC = main.cc > > include $(L4DIR)/mk/prog.mk > > The compilation of the package fails with an undefined reference in main.cc > to a function in test1.c (defined through test1.h). All the object files are > generated and I checked under build. What do you think is the issue? Did you declare the function with extern "C" linkage in main.cc? Without that the linker won't find C-functions called from C++-files. Martin _______________________________________________ l4-hackers mailing list l4-hackers@os.inf.tu-dresden.de http://os.inf.tu-dresden.de/mailman/listinfo/l4-hackers _______________________________________________ l4-hackers mailing list l4-hackers@os.inf.tu-dresden.de http://os.inf.tu-dresden.de/mailman/listinfo/l4-hackers _______________________________________________ l4-hackers mailing list l4-hackers@os.inf.tu-dresden.de http://os.inf.tu-dresden.de/mailman/listinfo/l4-hackers