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-bounces@os.inf.tu-dresden.de] on behalf of Martin Küttler [martin.kuettler@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
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