编译以下代码时遇到问题:
// writing on a text file
#include <iostream>
#include <fstream>
using namespace std;
int main () {
ofstream myfile ("example.txt");
if (myfile.is_open())
{
myfile << "This is a line.\n";
myfile << "This is another line.\n";
myfile.close();
}
else cout << "Unable to open file";
return 0;
}
编译:
g++ -c -O2 -Wall -Wno-unused -fexceptions -I. -I../../../stub -D_REENTRANT -D_THREAD_SAFE -I. -o t.o ./test.cc
g++ -o t -O2 -Wall -Wno-unused -fexceptions -Wl,-brtl -Wl,-blibpath:/lib:/usr/lib t.o -lpthreads
编译提出了一些警告:
ld: 0711-224 WARNING: Duplicate symbol: .__divdi3
ld: 0711-224 WARNING: Duplicate symbol: .__moddi3
ld: 0711-224 WARNING: Duplicate symbol: .__udivdi3
ld: 0711-224 WARNING: Duplicate symbol: .__umoddi3
ld: 0711-224 WARNING: Duplicate symbol: .__udivmoddi4
ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more information.
生成的二进制文件似乎执行OK:
$ ./t
$ echo $?
0
输出文件已创建但为空!?!
我会非常感谢任何关于问题的指示。
答案 0 :(得分:1)
Libpath设置不正确,导致问题。正确的设置应该是
LIBPATH = /选择/免费软件/ LIB / GCC / PowerPC的IBM-aix6.1.0.0 / 4.2.0 /