Trying to bind to cpp code I stop at some moment having undefined reference to some cpp function. But objdump -Ct cpplibrary.so shows me that this cpp function exists in the library. linker message about cpp function is _identical_ to objdump message so I don't know where is the difference. For example linker says:
`undefined reference to `Namespace::StructName::method_name(Namespace::Otherstruct const*)`
And ojbdump called by command:
```
objdump -Ct libLibrary.so | method_name
```
shows the following:
```
0000000000026ed0  w    F .text  0000000000000025 Namespace::StructName::method_name(Namespace::Otherstruct const*)
```
That is two outputs are identical.
Could someone help what to do to investigate the problem?
Thanks in advance

On Friday, 26 May 2017 at 15:17:08 UTC, drug wrote:
> Trying to bind to cpp code I stop at some moment having undefined reference to some cpp function. But objdump -Ct cpplibrary.so shows me that this cpp function exists in the library. linker message about cpp function is _identical_ to objdump message so I don't know where is the difference. For example linker says:
> `undefined reference to `Namespace::StructName::method_name(Namespace::Otherstruct const*)`
> And ojbdump called by command:
> ```
> objdump -Ct libLibrary.so | method_name
> ```
> shows the following:
> ```
> 0000000000026ed0  w    F .text  0000000000000025 Namespace::StructName::method_name(Namespace::Otherstruct const*)
> ```
> That is two outputs are identical.
> Could someone help what to do to investigate the problem?
> Thanks in advance

Thats weird. DMD may have got the mangling wrong. Could you post the exact mangling (i.e. non-demangled)? And if DMD has got it wrong and its just the one function you could just `pragma(mangle, ...);` it.

On Friday, 26 May 2017 at 15:17:08 UTC, drug wrote:
> Trying to bind to cpp code I stop at some moment having undefined reference to some cpp function. But objdump -Ct cpplibrary.so shows me that this cpp function exists in the library. linker message about cpp function is _identical_ to objdump message so I don't know where is the difference. For example linker says:
> `undefined reference to `Namespace::StructName::method_name(Namespace::Otherstruct const*)`
> And ojbdump called by command:
> ```
> objdump -Ct libLibrary.so | method_name
> ```
> shows the following:
> ```
> 0000000000026ed0  w    F .text  0000000000000025 Namespace::StructName::method_name(Namespace::Otherstruct const*)
> ```
> That is two outputs are identical.
> Could someone help what to do to investigate the problem?
> Thanks in advance

Hi, Welcome to D!

Hi, Welcome to D!

27.05.2017 02:44, Nicholas Wilson пишет:
>
> Thats weird. DMD may have got the mangling wrong. Could you post the
> exact mangling (i.e. non-demangled)? And if DMD has got it wrong and its
> just the one function you could just `pragma(mangle, ...);` it.
I use pragma(mangle, "...") (how I forget about it?) and it works now, so probable DMD have got the mangling wrong. Trying to reduce case, but code isn't trivial nether D nor C++ side...

On Friday, 26 May 2017 at 15:17:08 UTC, drug wrote:
> Trying to bind to cpp code I stop at some moment having undefined reference to some cpp function. But objdump -Ct cpplibrary.so shows me that this cpp function exists in the library. linker message about cpp function is _identical_ to objdump message so I don't know where is the difference. For example linker says:
> `undefined reference to `Namespace::StructName::method_name(Namespace::Otherstruct const*)`
> And ojbdump called by command:
> ```
> objdump -Ct libLibrary.so | method_name
> ```
> shows the following:
> ```
> 0000000000026ed0  w    F .text  0000000000000025 Namespace::StructName::method_name(Namespace::Otherstruct const*)
> ```
> That is two outputs are identical.
> Could someone help what to do to investigate the problem?
> Thanks in advance

If you were compiling C++ code, you could get such error if method_name was declared const in the library, and you tried to link it as non-const.

== Library ==
struct StructName { void method_name(...) const { ... } };

== Your Code ==
struct StructName { void method_name(...); /* NOTE: no const here */ };

Don't know if that is the issue in your case.