一个关于wvstreams很怪异的编译问题！

[rhy2K3]

我准备交叉编译wvstreams到我的开发板上，但是发现编译下面的文件时老是出问题，不得其解，期望高手提示一二。

template <class RET>
class WvCallbackBase
{
protected:
public:
// Fake is a boring object type that we use for calling our "generic"
// member function pointers. Strangely, it crashes if Fake doesn't
// have a virtual table, so we have an empty virtual function to make it
// happy. (This is all a bit evil, but only because C++ sucks. When
// they pass me a callback, they _know_ which function I want to call; I
// don't need to resolve it at runtime...)
struct Fake { virtual void silly() {} };

// FakeFunc is a completely generic member-function pointer. Actually the
// functions we _really_ call aren't part of the Fake class and probably
// have different parameters, but some hideous typecasts should fix that
// right up.
typedef RET (Fake::*FakeFunc)();
typedef RET (*FakeGlobalFunc)();

Fake *obj;

union {
FakeFunc func;
FakeGlobalFunc globalfunc;
};

WvCallbackBase::WvCallbackBase(void *_obj, FakeFunc _func)
: obj((Fake *)_obj), func(_func)
{ }

WvCallbackBase::WvCallbackBase(FakeGlobalFunc _func)
: obj(0), globalfunc(_func)
{ }

...
};

我的交叉编译器老是提示Fake has not been undeclared,但是使用标准g++编译是没有问题的，请问这是怎么一回事啊？

[taodm]

升级编译器。
要么，你自己想办法去掉模板。

[rhy2K3]

升级编译器，对于我应该不可行。 typedef RET (Fake::*FakeFunc)() 这几句有没高手解释一下，这种代码写的也忒他nnd的难懂拉吧！ 伤心~~~

[rhy2K3]

自己顶

[jieao111]

typedef RET (Fake::*FakeFunc)()


成员函数的指针啊。。和typedef void (Fake::*FakeFunc)() 差不多吧。。

[jieao111]

http://www.google.cn/search?sourceid=navclient&hl=zh-CN&ie=UTF-8&rlz=1T4GWYJ_zh-CNCN266CN267&q=%e6%88%90%e5%91%98%e5%87%bd%e6%95%b0%e7%9a%84%e6%8c%87%e9%92%88

[ttkk_2007]

typedef RET (Fake::*FakeFunc)()
=========================
指向类Fake的成员函数的指针，返回RET，参数为空，

[icosagon]

Fake头文件？

[systemthink]

关注。。。

[bestvalentine]

学习

[myullian]

指向Fzke成员函数的指针

[珍惜生命远离CPP]

编译器的问题吧

[Supper_Jerry]

应该就是编译器有关的。
typedef RET (Fake::*FakeFunc)()
指向类成员函数的指针。必须是类成员函数哦。

[rhy2K3]

顶

[taodm]

wvcallback.h是这个东西的派生类吧。
要用WvCallbackBase<XXX>::Fake等。

[rhy2K3]

typedef RET (Fake::*FakeFunc)() 应该是定义fake结构体中的返回植类型为RET的函数指针类型。

[独孤过儿]

$ g++ -v

输出结果贴上来

[rhy2K3]

就相当于声名一个int型，不过这里的类型是函数类型，int也变成了FakeFunc

[rhy2K3]

/utils/wvcallback.h:106: error: `Fake' has not been declared
/utils/wvcallback.h:106: error: expected unqualified-id before '*' token
/utils/wvcallback.h:106: error: expected `)' before '*' token
/utils/wvcallback.h:106: error: expected `)' before '*' token
/utils/wvcallback.h: In constructor `WvCallback0<RET>::WvCallback0(RET (*)())':/utils/wvcallback.h:106: error: `FakeGlobalFunc' undeclared (first use this function)/utils/wvcallback.h:106: error: (Each undeclared identifier is reported only once for each function it appears in.)
/utils/wvcallback.h: In member function `RET WvCallback0<RET>::operator()()':
/utils/wvcallback.h:106: error: `obj' undeclared (first use this function)/utils/wvcallback.h:106: error: `Func' undeclared (first use this function)/utils/wvcallback.h:106: error: expected `)' before "func"
/utils/wvcallback.h:106: error: `globalfunc' undeclared (first use this function) /utils/wvcallback.h: In constructor `WvCallback0_bound<RET, T>::WvCallback0_bound(T&, RET (T::*)())':/utils/wvcallback.h:108: error: `Fake' undeclared (first use this function)
/utils/wvcallback.h:108: error: expected primary-expression before ')' token/utils/wvcallback.h:108: error: `Func' has not been declared
/utils/wvcallback.h: At global scope:
/utils/wvcallback.h:111: error: `Fake' has not been declared
/utils/wvcallback.h:111: error: expected unqualified-id before '*' token
/utils/wvcallback.h:111: error: expected `)' before '*' token
/utils/wvcallback.h:111: error: expected `)' before '*' token
/utils/wvcallback.h: In constructor `WvCallback1<RET, P1>::WvCallback1(RET (*)(P1))': /utils/wvcallback.h:111: error: `FakeGlobalFunc' undeclared (first use this function) /utils/wvcallback.h: In member function `RET WvCallback1<RET, P1>::operator()(P1)':
/utils/wvcallback.h:111: error: `obj' undeclared (first use this function)
/utils/wvcallback.h:111: error: `Func' undeclared (first use this function)/utils/wvcallback.h:111: error: expected `)' before "func" /utils/wvcallback.h:111: error: `globalfunc' undeclared (first use this function)
/utils/wvcallback.h: In constructor `WvCallback1_bound<RET,

[rhy2K3]

我看了一下， 我交叉编译器的版本比g++的版本还新一些。
g++ -v的信息：

Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.3.2/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-checking --with-system-zlib --enable-__cxa_atexit --host=i386-redhat-linux
Thread model: posix
gcc version 3.3.2 20031022 (Red Hat Linux 3.3.2-1)

我的交叉编译器的 g++ -v 后的信息：
Reading specs from /opt/toolchains/uclibc-crosstools_gcc-3.4.2_uclibc-20050502/bin/../lib/gcc/mips-linux-uclibc/3.4.2/specs
Configured with: ../gcc-3.4.2/configure --prefix=/opt/toolchains/uclibc-crosstools_gcc-3.4.2_uclibc-20050502/ --target=mips-linux-uclibc --build=mips-linux --host=mips-linux --enable-target-optspace --disable-nls --with-gnu-ld --enable-shared --enable-languages=c,c++ --enable-threads --infodir=/opt/toolchains/uclibc-crosstools_gcc-3.4.2_uclibc-20050502/info --mandir=/opt/toolchains/uclibc-crosstools_gcc-3.4.2_uclibc-20050502/man --disable-__cxa_atexit --disable-checking --with-arch=mips32
Thread model: posix
gcc version 3.4.2

有哪位高手能看出什么东东来啊

[stevenkoh]

后来通过了吗？我在 wvstreams 4.6 下，修改了 configure 文件可以通过了。把其中的 with_openssl =no 全部替换成 with_openssl=yes