gcc问题！

无双

如果只是声明一个函数
但没有定义它
那么就会报unresolve error ,xxx not found

就是这个原因

basten54188

你看我的form1.h的源代码！有FORM1的定义啊！
form1.h
#ifndef FORM1_H
#define FORM1_H

#include <qvariant.h>
#include <qwidget.h>
class QVBoxLayout;
class QHBoxLayout;
class QGridLayout;
class QPushButton;

class Form1 : public QWidget
{
Q_OBJECT

public:
Form1( QWidget* parent = 0, const char* name = 0, WFlags fl = 0 );
~Form1();

QPushButton* PushButton1;


};

#endif

libinary

既然gcc -I/usr/lib/qt/include main.cpp -L/usr/lib/qt/lib -lqt没多少错误，那你试试：
g++ -I/usr/lib/qt/include main.cpp form1.cpp -L/usr/lib/qt/lib -lqt

kj501

libinary兄回答问题很是细心呀，值得表扬。

basten54188

KJ501兄别光表扬别人啊！
你也帮偶瞧瞧程序！

kj501

我不懂QT，帮不上忙。

无双

头文件只是声明
而不是定义

有
{
}这个的才叫定义

无双

另外-c表示只是编译不连接
如果一个程序由多个c文件组成
那么对每个c文件选编译
最后再连接它们生成的.o文件
精华那篇文章看了没有
看看gcc选项说明
另外也建议看看其它人写的makefile

无双

如程序a 由 a.cpp b.cpp组成
那么
gcc -c a.cpp -o a.o
gcc -c b.cpp -o b.o
gcc a.o b.o -o a//产生a程序

basten54188

libinary 老兄：按照你说的那样的话错误更多！
/tmp/ccV6jusA.o: In function `Form1::Form1[not-in-charge](QWidget*, char const*, unsigned)':
/tmp/ccV6jusA.o(.text+0x20): undefined reference to `vtable for Form1'
/tmp/ccV6jusA.o(.text+0x2c): undefined reference to `vtable for Form1'
/tmp/ccV6jusA.o(.text+0x73): undefined reference to `Form1::trUtf8(char const*, char const*)'
/tmp/ccV6jusA.o(.text+0x18f): undefined reference to `Form1::trUtf8(char const*, char const*)'
/tmp/ccV6jusA.o: In function `Form1::Form1[in-charge](QWidget*, char const*, unsigned)':
/tmp/ccV6jusA.o(.text+0x23c): undefined reference to `vtable for Form1'
/tmp/ccV6jusA.o(.text+0x248): undefined reference to `vtable for Form1'
/tmp/ccV6jusA.o(.text+0x28f): undefined reference to `Form1::trUtf8(char const*, char const*)'
/tmp/ccV6jusA.o(.text+0x3ab): undefined reference to `Form1::trUtf8(char const*, char const*)'
/tmp/ccV6jusA.o: In function `Form1::~Form1 [not-in-charge]()':
/tmp/ccV6jusA.o(.text+0x443): undefined reference to `vtable for Form1'
/tmp/ccV6jusA.o(.text+0x44f): undefined reference to `vtable for Form1'
/tmp/ccV6jusA.o: In function `Form1::~Form1 [in-charge]()':
/tmp/ccV6jusA.o(.text+0x489): undefined reference to `vtable for Form1'
/tmp/ccV6jusA.o(.text+0x495): undefined reference to `vtable for Form1'
/tmp/ccV6jusA.o: In function `Form1::~Form1 [in-charge deleting]()':
/tmp/ccV6jusA.o(.text+0x4cf): undefined reference to `vtable for Form1'
/tmp/ccV6jusA.o(.text+0x4db): more undefined references to `vtable for Form1' follow
collect2: ld returned 1 exit status