digitalmars.D.learn - Linker error: Symbol Undefined
- Namespace (46/46) Oct 11 2013 Hey, I'm curious about this linker error:
- Namespace (3/3) Oct 11 2013 It's annoying and I don't get it. What is the problem of Optlink?
- Brad Roberts (5/50) Oct 11 2013 It's due to having the destructor versioned out when building foo and vi...
- Namespace (1/1) Oct 11 2013 Ok, that is what I wanted to hear.
- Namespace (5/72) Oct 11 2013 Another question: Is there a way that the DTor is only generated
- Elvis Zhou (22/97) Oct 13 2013 No, you can't. However, you can use other version condition
Hey, I'm curious about this linker error:
OPTLINK (R) for Win32 Release 8.00.13
Copyright (C) Digital Mars 1989-2010 All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
bar.obj(bar)
Error 42: Symbol Undefined _D3foo1A6__dtorMFZv
--- errorlevel 1
foo.d:
----
debug import std.stdio;
struct A {
public:
int id;
this(int id) {
debug writeln("CTor A with ", id);
this.id = id;
}
debug ~this() {
writeln("DTor A with ", id);
}
}
----
bar.d
----
import foo;
void test(A a) {
a.id++;
}
void main() {
test(A(42));
A a = A(23);
test(a);
}
----
Usage:
C:\Users\Besitzer\Desktop>dmd -lib foo.d
C:\Users\Besitzer\Desktop>dmd bar.d foo.lib -debug
OPTLINK (R) for Win32 Release 8.00.13
Copyright (C) Digital Mars 1989-2010 All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
bar.obj(bar)
Error 42: Symbol Undefined _D3foo1A6__dtorMFZv
--- errorlevel 1
====
Without -debug or with 'debug' _in_ the DTor (before writeln)
instead before the DTor works fine.
Oct 11 2013
"Namespace" <rswhite4 googlemail.com> It's annoying and I don't get it. What is the problem of Optlink? I tried version(unittest) instead of debug. It works then with -debug, but if you compile with -unittest you get the same error.
Oct 11 2013
It's due to having the destructor versioned out when building foo and visible
when building bar.
When brought together, you've created an incompatible whole. There's no
destructor actually
included in foo's .o file that you told it it could expect to find.
There's no bug in the compiler or linker, just your usage of mis-matched code.
On 10/11/13 11:39 AM, Namespace wrote:
Hey, I'm curious about this linker error:
OPTLINK (R) for Win32 Release 8.00.13
Copyright (C) Digital Mars 1989-2010 All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
bar.obj(bar)
Error 42: Symbol Undefined _D3foo1A6__dtorMFZv
--- errorlevel 1
foo.d:
----
debug import std.stdio;
struct A {
public:
int id;
this(int id) {
debug writeln("CTor A with ", id);
this.id = id;
}
debug ~this() {
writeln("DTor A with ", id);
}
}
----
bar.d
----
import foo;
void test(A a) {
a.id++;
}
void main() {
test(A(42));
A a = A(23);
test(a);
}
----
Usage:
C:\Users\Besitzer\Desktop>dmd -lib foo.d
C:\Users\Besitzer\Desktop>dmd bar.d foo.lib -debug
OPTLINK (R) for Win32 Release 8.00.13
Copyright (C) Digital Mars 1989-2010 All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
bar.obj(bar)
Error 42: Symbol Undefined _D3foo1A6__dtorMFZv
--- errorlevel 1
====
Without -debug or with 'debug' _in_ the DTor (before writeln) instead before
the DTor works fine.
Oct 11 2013
On Friday, 11 October 2013 at 21:16:38 UTC, Brad Roberts wrote:It's due to having the destructor versioned out when building foo and visible when building bar. When brought together, you've created an incompatible whole. There's no destructor actually included in foo's .o file that you told it it could expect to find. There's no bug in the compiler or linker, just your usage of mis-matched code. On 10/11/13 11:39 AM, Namespace wrote:Another question: Is there a way that the DTor is only generated if I compile foo with -debug? So that if I compile and link bar.d and foo.lib, even with -debug, but compiled foo.d without, the DTor is automatically generated? Hope that is not to weird. :DHey, I'm curious about this linker error: OPTLINK (R) for Win32 Release 8.00.13 Copyright (C) Digital Mars 1989-2010 All rights reserved. http://www.digitalmars.com/ctg/optlink.html bar.obj(bar) Error 42: Symbol Undefined _D3foo1A6__dtorMFZv --- errorlevel 1 foo.d: ---- debug import std.stdio; struct A { public: int id; this(int id) { debug writeln("CTor A with ", id); this.id = id; } debug ~this() { writeln("DTor A with ", id); } } ---- bar.d ---- import foo; void test(A a) { a.id++; } void main() { test(A(42)); A a = A(23); test(a); } ---- Usage: C:\Users\Besitzer\Desktop>dmd -lib foo.d C:\Users\Besitzer\Desktop>dmd bar.d foo.lib -debug OPTLINK (R) for Win32 Release 8.00.13 Copyright (C) Digital Mars 1989-2010 All rights reserved. http://www.digitalmars.com/ctg/optlink.html bar.obj(bar) Error 42: Symbol Undefined _D3foo1A6__dtorMFZv --- errorlevel 1 ==== Without -debug or with 'debug' _in_ the DTor (before writeln) instead before the DTor works fine.
Oct 11 2013
On Friday, 11 October 2013 at 22:33:31 UTC, Namespace wrote:On Friday, 11 October 2013 at 21:16:38 UTC, Brad Roberts wrote:No, you can't. However, you can use other version condition instead to avoid debug code. foo.d: ---- version(TrackDTor){ import std.stdio; } struct A { public: int id; this(int id) { debug writeln("CTor A with ", id); this.id = id; } version(TrackDTor){ ~this() { writeln("DTor A with ", id); } } } then compile foo.d with -version=TrackDTorIt's due to having the destructor versioned out when building foo and visible when building bar. When brought together, you've created an incompatible whole. There's no destructor actually included in foo's .o file that you told it it could expect to find. There's no bug in the compiler or linker, just your usage of mis-matched code. On 10/11/13 11:39 AM, Namespace wrote:Another question: Is there a way that the DTor is only generated if I compile foo with -debug? So that if I compile and link bar.d and foo.lib, even with -debug, but compiled foo.d without, the DTor is automatically generated? Hope that is not to weird. :DHey, I'm curious about this linker error: OPTLINK (R) for Win32 Release 8.00.13 Copyright (C) Digital Mars 1989-2010 All rights reserved. http://www.digitalmars.com/ctg/optlink.html bar.obj(bar) Error 42: Symbol Undefined _D3foo1A6__dtorMFZv --- errorlevel 1 foo.d: ---- debug import std.stdio; struct A { public: int id; this(int id) { debug writeln("CTor A with ", id); this.id = id; } debug ~this() { writeln("DTor A with ", id); } } ---- bar.d ---- import foo; void test(A a) { a.id++; } void main() { test(A(42)); A a = A(23); test(a); } ---- Usage: C:\Users\Besitzer\Desktop>dmd -lib foo.d C:\Users\Besitzer\Desktop>dmd bar.d foo.lib -debug OPTLINK (R) for Win32 Release 8.00.13 Copyright (C) Digital Mars 1989-2010 All rights reserved. http://www.digitalmars.com/ctg/optlink.html bar.obj(bar) Error 42: Symbol Undefined _D3foo1A6__dtorMFZv --- errorlevel 1 ==== Without -debug or with 'debug' _in_ the DTor (before writeln) instead before the DTor works fine.
Oct 13 2013