gcc g++ 3.4和4.5的区别 extra qualification ‘const char*’ to ‘char*’等错误

在编译Kphone4.2时，提示以下错误：

c++ -I/usr/lib/qt3/include -Wall -O3 -I. -I../gsm -I../ilbc -I../dissipate2 -DHAVE_CONFIG_H -DSHARE_DIR=\"/usr/local/share/apps/kphone\" -DPO_DIR=\"/usr/local/share/kphone/translations//\" -c -o main.o main.cpp
In file included from main.cpp:5:
kcallwidget.h:70: error: extra qualification ‘KCallWidget::’ on member ‘setDTMFSender’
In file included from main.cpp:7:
kphoneview.h:57: error: extra qualification ‘KPhoneView::’ on member ‘DoCall’
make[1]: *** [main.o] 错误 1
make[1]: Leaving directory `/home/soft/kphone/kphone'
make: *** [all] 错误 2

查找原因如下：

很多比较旧的代码会有如写法
class Foo
{

int Foo::Foo(void);

}
在g++ 4.1以后会报错 extra qualification

直接改为
class Foo
{

int Foo(void);

}
即可

Extra qualification errors are common with gcc4. This means a class is
redundantly mentioned with a class function. Just remove the part before :: on the mentioned line"

Extra qualification error是使用版本4以上的GCC/G++编译C＋＋程序时经常出现的错误。

这是语句中多引用了类的名称--把函数前面：：的类名称去掉即可

如：

std::string Socket::connectionName();

connectionName是类Socket的成员函数，而Socket是std 中type为string的子类.

这里不用重复引用Socket，可直接写成

std::string connectionName();

1、invalid conversion from ‘const char*’ to ‘char*’

解决：

pn = strchr(p, PATH_SP);

改为

pn = (char *)strchr(p, PATH_SP);

2、 ‘PACKAGE_STRING’ was not declared in this scope

‘PACKAGE_BUGREPORT’ was not declared in this scope

解决：

fprintf(stderr,"%s Copyright: YuHong(992126018601033)",PACKAGE_STRING);

fprintf(stderr,"bug report: %s\n\n",PACKAGE_BUGREPORT);

替换为：

fprintf(stderr,"CTorrent devel Copyright: YuHong(992126018601033)");

fprintf(stderr,"bug report: [e-mail]\n\n");

3、fatal error: openssl/sha.h: 没有那个文件或目录

缺少 openssl dev包，解决：安装libssl-dev

sudo apt-get install libssl-dev

4、undefined reference to `SHA1_Init'

undefined reference to `SHA1_Update'

undefined reference to `SHA1_Final'

解决1：

1.确认你装了openssl

2.g++ 后加上参数 -lssl

解决2：

或者/usr/lib/libssl.so加入程序library库下

Eclipse CDT下设置g++参数的方法

Project->Properties->C/C++ Build->Setting->GCC C++ Linker->Miscellaneous->Linker Flag 处加上 -lssl