Re: [libvirt] Compiling C++ program with libvirt
2010/7/22 adrian wyssen <wyssenadrian(a)gmail.com>:
Hi everyone
I am trying to compile a C++ program which uses libvirt to connect to an
ESXi host. I got the code running if I wrote it in C, directly in the
hellolibvirt.c example. However, I am now trying to compile that code in a
C++ file which is not inside the example directory.
I tried to compile with the following command:
g++ -g -D debug=1 -c -llibvirt ESXWrapper.cpp
g++ -g -D debug=1 -o ESXWrapper ESXWrapper.o
The first line passes and creates ESXWrapper.o file. But when I run the
second line, it gives me the following error:
---
g++ -g -D debug=1 -c -llibvirt ESXWrapper.cpp
At this point g++ (actually ld) should have told you that it cannot
find liblibvirt.so. when you pass a library to g++ using the -l you
need to remove the lib prefix from the name, because it's implicit and
ld will add it on its own. Passing -llibvirt will make ld look for the
wrong file.
g++ -g -D debug=1 -o ESXWrapper ESXWrapper.o
ESXWrapper.o: In function `VPopCWrapper':
/home/wyssen/school/Dropbox/virtualPOPC-1/NEW/vpopcwrapper/ESXWrapper.cpp:124:
undefined reference to `virConnectOpenAuth'
/home/wyssen/school/Dropbox/virtualPOPC-1/NEW/vpopcwrapper/ESXWrapper.cpp:133:
undefined reference to `virConnectGetURI'
/home/wyssen/school/Dropbox/virtualPOPC-1/NEW/vpopcwrapper/ESXWrapper.cpp:144:
undefined reference to `virConnectClose'
/home/wyssen/school/Dropbox/virtualPOPC-1/NEW/vpopcwrapper/ESXWrapper.cpp:124:
undefined reference to `virConnectOpenAuth'
/home/wyssen/school/Dropbox/virtualPOPC-1/NEW/vpopcwrapper/ESXWrapper.cpp:133:
undefined reference to `virConnectGetURI'
/home/wyssen/school/Dropbox/virtualPOPC-1/NEW/vpopcwrapper/ESXWrapper.cpp:144:
undefined reference to `virConnectClose'
ESXWrapper.o: In function `showError':
/home/wyssen/school/Dropbox/virtualPOPC-1/NEW/vpopcwrapper/ESXWrapper.cpp:186:
undefined reference to `virConnCopyLastError'
/home/wyssen/school/Dropbox/virtualPOPC-1/NEW/vpopcwrapper/ESXWrapper.cpp:202:
undefined reference to `virResetError'
collect2: ld returned 1 exit status
make: *** [all] Error 1
---
My makefile is the follwing:
---
#vars
CC=g++
OUTPUTFILE=ESXWrapper
O_FILES=ESXWrapper.o
FLAGS=-g -D debug=1
.PHONY: all
all: esxwrapper
$(CC) $(FLAGS) -o $(OUTPUTFILE) $(O_FILES)
esxwrapper: ESXWrapper.cpp VPopCWrapper.h
$(CC) $(FLAGS) -c -llibvirt ESXWrapper.cpp
$(CC) $(FLAGS) -c -lvirt ESXWrapper.cpp
This should work better, assuming libvirt.so can be found in the
common ld library path.
.PHONY: run
run: all
./bignum
.PHONY: clean
clean:
rm -f $(O_FILES)
.PHONY: clean_all
clean_all: clean
rm -f $(OUTPUTFILE)
---
Can anybody give me a hint, how to link correctly to libvirt. And also tell
me, if there are special functions to use with C++, other than the examples
provided in the source code, which are written in C.
Thank you
Adrian
Just use the C API, nothing special for C++.
Matthias