无法将流代码与 gcc 链接
我在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
编译给出一些警告：
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正常：
$ ./t
$ echo $?
0
输出文件已创建但为空！？！
对于任何关于问题可能是什么的指示，我将非常感激。
I have a problem compiling the following code:
// 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;
}
To compile:
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
The compile gives some warnings:
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.
The resulting binary appears to execute OK:
$ ./t
$ echo $?
0
The output file is created but empty !?!
I would be VERY grateful for any pointers as to what the problem might be.
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Libpath设置不正确，导致该问题。正确的设置应该是
LIBPATH=/opt/freeware/lib/gcc/powerpc-ibm-aix6.1.0.0/4.2.0/
Libpath was set incorrectly, causing the problem. The correct setting should be
LIBPATH=/opt/freeware/lib/gcc/powerpc-ibm-aix6.1.0.0/4.2.0/