• Ben Hinkle (50/50) Dec 06 2004 I'm wondering how to work around a linking issue involving templates and...
• Sean Kelly (2/2) Dec 07 2004 This shouldn't happen. I would consider it a bug.
• Thomas Kuehne (15/64) Dec 12 2004 -----BEGIN PGP SIGNED MESSAGE-----
• Thomas Kuehne (10/26) Dec 12 2004 Just a word of warning:

"Ben Hinkle" <ben.hinkle gmail.com> writes:

I'm wondering how to work around a linking issue involving templates and 
separate compilation. I have three files temp1.d temp2.d and temp3.d:

module temp1;
struct Foo(T) {
  void set(T x) { y = x; }
  T y;
}

module temp2;
import temp1;
void t2() {
  Foo!(int)* x;
  x = new Foo!(int);
  x.set(10);
}

module temp3;
import temp1;
import temp2;
void t3() {
  Foo!(int)* x;
  x = new Foo!(int);
  x.set(100);
}
int main() {
  t2();
  t3();
  return 0;
}

Now if I run
 dmd temp1.d temp2.d temp3.d
then everything works fine. But if I run
 dmd -c temp1;d
 dmd -c temp2.d
 dmd -c temp3.d
 dmd temp1.obj temp2.obj temp3.obj
I get:
C:\d>dmd temp1.obj temp2.obj temp3.obj
C:\dmd\bin\..\..\dm\bin\link.exe temp1+temp2+temp3,,,user32+kernel32/noi;
OPTLINK (R) for Win32  Release 7.50B1
Copyright (C) Digital Mars 1989 - 2001  All Rights Reserved

temp3.obj(temp3)  Offset 001C7H Record Type 00C3
 Error 1: Previous Definition Different : _D5temp15Foo_i3Foo3setFiZv
--- errorlevel 1

Is this going to be a fact of life involving templates? Or is this a 
temporary state? I can redo my MinTL makefiles to always list everything on 
one command line when building unittests. I'm not sure if it will come up 
elsewhre. I'll have to check that none of my libraries contain template 
instantiations that could end up conflicting with user code. It basically 
makes separate compilation incompatible with templates unless you are very 
careful to never mix object files that could share a template instantiation.

-Ben 

Sean Kelly <sean f4.ca> writes:

This shouldn't happen.  I would consider it a bug.


Sean

"Thomas Kuehne" <thomas-dloop kuehne.cn> writes:

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Added to DStress:
http://svn.kuehne.cn/dstress/complex/linking/

all 3 in one step:
make complex/linking/linking_01

3 in 3 steps:
make complex/linking/linking_02

Thomas

Ben Hinkle schrieb am Mon, 6 Dec 2004 20:04:51 -0500:
 I'm wondering how to work around a linking issue involving templates and
 separate compilation. I have three files temp1.d temp2.d and temp3.d:

 module temp1;
 struct Foo(T) {
   void set(T x) { y = x; }
   T y;
 }

 module temp2;
 import temp1;
 void t2() {
   Foo!(int)* x;
   x = new Foo!(int);
   x.set(10);
 }

 module temp3;
 import temp1;
 import temp2;
 void t3() {
   Foo!(int)* x;
   x = new Foo!(int);
   x.set(100);
 }
 int main() {
   t2();
   t3();
   return 0;
 }

 Now if I run
  dmd temp1.d temp2.d temp3.d
 then everything works fine. But if I run
  dmd -c temp1;d
  dmd -c temp2.d
  dmd -c temp3.d
  dmd temp1.obj temp2.obj temp3.obj
 I get:
 C:\d>dmd temp1.obj temp2.obj temp3.obj
 C:\dmd\bin\..\..\dm\bin\link.exe temp1+temp2+temp3,,,user32+kernel32/noi;
 OPTLINK (R) for Win32  Release 7.50B1
 Copyright (C) Digital Mars 1989 - 2001  All Rights Reserved

 temp3.obj(temp3)  Offset 001C7H Record Type 00C3
  Error 1: Previous Definition Different : _D5temp15Foo_i3Foo3setFiZv
 --- errorlevel 1

 Is this going to be a fact of life involving templates? Or is this a
 temporary state? I can redo my MinTL makefiles to always list everything on
 one command line when building unittests. I'm not sure if it will come up
 elsewhre. I'll have to check that none of my libraries contain template
 instantiations that could end up conflicting with user code. It basically
 makes separate compilation incompatible with templates unless you are very
 careful to never mix object files that could share a template instantiation.


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Thomas Kuehne <thomas-dloop kuehne.thisisspam.cn> writes:

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

 Now if I run
  dmd temp1.d temp2.d temp3.d
 then everything works fine. But if I run
  dmd -c temp1;d
  dmd -c temp2.d
  dmd -c temp3.d
  dmd temp1.obj temp2.obj temp3.obj
 I get:
 C:\d>dmd temp1.obj temp2.obj temp3.obj
 C:\dmd\bin\..\..\dm\bin\link.exe temp1+temp2+temp3,,,user32+kernel32/noi;
 OPTLINK (R) for Win32  Release 7.50B1
 Copyright (C) Digital Mars 1989 - 2001  All Rights Reserved

 temp3.obj(temp3)  Offset 001C7H Record Type 00C3
  Error 1: Previous Definition Different : _D5temp15Foo_i3Foo3setFiZv
 --- errorlevel 1


Just a word of warning:
GDC successfully compiles them separately, but fails on the combined
invocation..

Thomas


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