I am sorry that I was not reading g++ man page carefully.
'g++ a.o -lb' will search library b after a.o. So a.o must be put in
front of '-b' in previous case.
On 05/17/2010 03:26 PM, WU Jun wrote:
I encounter a situation:
g++ b.o a.o -o c -lboost_test_exec_monitor-mt
is ok, while
g++ -o c -lboost_test_exec_monitor-mt b.o a.o
fails:
a.o: In function `init_unit_test_suite(int, char**)':
a.cpp:(.text+0x0): multiple definition of `init_unit_test_suite(int,
char**)'
/usr/lib/gcc/i686-pc-linux-gnu/4.5.0/../../../libboost_test_exec_monitor-mt.a(test_main.o):(.text+0x70):
first defined here
...
It seems "a.o" must be before "-lboost_test_exec_monitor-mt".
Why ?
I have googled around and read g++ manual and haven't found really
helpful information ...
I'm using Archlinux i686, gcc 4.5.0 and 1.41.0.
a.o and b.o are created by this shell script:
cat > a.cpp << !
#define BOOST_TEST_MAIN
#include <boost/test/unit_test.hpp>
#include "b.h"
BOOST_AUTO_TEST_CASE( SomeTest ) {
A a;
BOOST_CHECK( a.get() == 3);
}
!
cat > b.cpp << !
#include "b.h"
int A::get() {
return 3;
}
!
cat > b.h << !
class A {
public:
int get();
};
!
# compile
g++ a.cpp -c -o a.o
g++ b.cpp -c -o b.o
