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Re: undefined reference, plz help
- From: Brian Budge <brian dot budge at gmail dot com>
- To: eric lin <ericlin at fsshl dot zzn dot com>
- Cc: gcc-help at gcc dot gnu dot org
- Date: Wed, 8 Jun 2011 21:52:26 -0700
- Subject: Re: undefined reference, plz help
- References: <952B8356D3927B24DA38FCE66381CEF0@ericlin.fsshl.zzn.com>
On Wed, Jun 8, 2011 at 9:26 PM, eric lin <ericlin@fsshl.zzn.com> wrote:
>
> Dear gcc programers:
>
> ?what may cause compile error (on 4.5.2 or maybe not)
> ------
> ?g++ pg49.cpp
> /tmp/ccUvNoPf.o: In function `main':
> pg49.cpp:(.text+0x42): undefined reference to `IntArray::IntArray(int*, int)'
> pg49.cpp:(.text+0x5e): undefined reference to `IntArrayRC::IntArrayRC(int*, int)'
> /tmp/ccUvNoPf.o: In function `IntArray::~IntArray()':
> pg49.cpp:(.text._ZN8IntArrayD2Ev[_ZN8IntArrayD5Ev]+0xb): undefined reference to `vtable for IntArray'
> /tmp/ccUvNoPf.o: In function `IntArrayRC::~IntArrayRC()':
> pg49.cpp:(.text._ZN10IntArrayRCD2Ev[_ZN10IntArrayRCD5Ev]+0xb): undefined reference to `vtable for IntArrayRC'
> collect2: ld returned 1 exit status
> --------
> eric ?/* I am happy to supply code I compiled, plz show up your private email address or email me privately */
>
>
>
>
This means that you've declared, but not defined those constructors.
At link time, the linker cannot find the code for those functions.
Brian