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digitalmars.D - Compile fails, don't know why

reply Nafees <nafees.hassan outlook.com> writes:
I tried to create a separate module for storing classes in, this 
is the new module
<code>
module qlib.classes;

//QLib.Classes
class tstrlist{
private:
	string[] list;
	uint taken;
public:
	string read(uint index){
		return list[index];
	}
	void set(uint index, string str){
		if (index>=list.length){
			list[index]=str;
		}
	}
	void add(string str){
		list.length++;
		list[list.length-1]=str;
	}
}
</code>
and the project's code
<code>
module main;

//import std.stdio;
import qlib.classes;

void main(){
	tstrlist slst = new tstrlist();
	//slst.add("str1");
	//readln;
}
</code>

And this is what I get after compile:
<code>
Building: LrnD (Release)
Performing main compilation...
Current dictionary: /home/nafees/Desktop/Projects/LrnD/LrnD
dmd -O -release "main.d"  "-I/usr/include/dmd" 
"-I/home/nafees/Desktop/Projects/DLibrary" "-odobj/Release" 
"-of/home/nafees/Desktop/Projects/LrnD/LrnD/bin/Release/LrnD" -w 
-vcolumns
obj/Release/LrnD.o: In function `_Dmain':
main.d:(.text._Dmain+0x9): undefined reference to 
`_D4qlib7classes8tstrlist7__ClassZ'
collect2: error: ld returned 1 exit status
--- errorlevel 1
Exit code 1
Build complete -- 1 error, 0 warnings

---------------------- Done ----------------------

Build: 1 error, 0 warnings
</code>
Mar 18 2016
parent reply Nafees <nafees.hassan outlook.com> writes:
On Friday, 18 March 2016 at 10:07:18 UTC, Nafees wrote:

 I tried to create a separate module for storing classes in, 
 this is the new module
 <code>
 module qlib.classes;

 [...]


Plus, the code works if the class is in the same module, and I 
did add the path to the QLib.classes module in the compiler.
Mar 18 2016
parent reply Mathias Lang <pro.mathias.lang gmail.com> writes:
On Friday, 18 March 2016 at 10:11:50 UTC, Nafees wrote:

 On Friday, 18 March 2016 at 10:07:18 UTC, Nafees wrote:

 I tried to create a separate module for storing classes in, 
 this is the new module
 <code>
 module qlib.classes;

 [...]


 Plus, the code works if the class is in the same module, and I 
 did add the path to the QLib.classes module in the compiler.


See the compilation command:
dmd -O -release "main.d"  "-I/usr/include/dmd" 
"-I/home/nafees/Desktop/Projects/DLibrary" "-odobj/Release" 
"-of/home/nafees/Desktop/Projects/LrnD/LrnD/bin/Release/LrnD" -w 
-vcolumns

Here your module is not linked in, only main.d
Mar 18 2016
parent reply Nafees <nafees.hassan outlook.com> writes:
On Friday, 18 March 2016 at 10:25:06 UTC, Mathias Lang wrote:

 On Friday, 18 March 2016 at 10:11:50 UTC, Nafees wrote:

 On Friday, 18 March 2016 at 10:07:18 UTC, Nafees wrote:

 I tried to create a separate module for storing classes in, 
 this is the new module
 <code>
 module qlib.classes;

 [...]


 Plus, the code works if the class is in the same module, and I 
 did add the path to the QLib.classes module in the compiler.


 See the compilation command:
 dmd -O -release "main.d"  "-I/usr/include/dmd" 
 "-I/home/nafees/Desktop/Projects/DLibrary" "-odobj/Release" 
 "-of/home/nafees/Desktop/Projects/LrnD/LrnD/bin/Release/LrnD" 
 -w -vcolumns

 Here your module is not linked in, only main.d


Now I created a folder in the usr/include/dmd named qlib and 
placed the module there, yet it won't work.
Mar 18 2016
next sibling parent Mathias Lang <pro.mathias.lang gmail.com> writes:
On Friday, 18 March 2016 at 10:38:00 UTC, Nafees wrote:

 On Friday, 18 March 2016 at 10:25:06 UTC, Mathias Lang wrote:

 On Friday, 18 March 2016 at 10:11:50 UTC, Nafees wrote:

 On Friday, 18 March 2016 at 10:07:18 UTC, Nafees wrote:

 I tried to create a separate module for storing classes in, 
 this is the new module
 <code>
 module qlib.classes;

 [...]


 Plus, the code works if the class is in the same module, and 
 I did add the path to the QLib.classes module in the compiler.


 See the compilation command:
 dmd -O -release "main.d"  "-I/usr/include/dmd" 
 "-I/home/nafees/Desktop/Projects/DLibrary" "-odobj/Release" 
 "-of/home/nafees/Desktop/Projects/LrnD/LrnD/bin/Release/LrnD" 
 -w -vcolumns

 Here your module is not linked in, only main.d


 Now I created a folder in the usr/include/dmd named qlib and 
 placed the module there, yet it won't work.


Just realized this was in the wrong forum. Please move your 
question to learn (http://forum.dlang.org/group/learn), as 
General is intended for general-purpose discussion.
You might want to provide additional informations, like which 
build tool you are using.

The problem is not where the module lives (the compiler would 
complain if it couldn't find it), but that you didn't ask for the 
module to be part of your executable.
To do so, you need to add `path/to/qlib/classes.d` to your 
command line.
Mar 18 2016
prev sibling parent Mike Parker <aldacron gmail.com> writes:
On Friday, 18 March 2016 at 10:38:00 UTC, Nafees wrote:


 Now I created a folder in the usr/include/dmd named qlib and 
 placed the module there, yet it won't work.


You have a fundamental misunderstanding here. Imported modules 
are not automatically compiled when you add them to the import 
path with -I. Imported modules still need to be compiled and 
linked into the program. You can do this in one of three ways:

1) Pass the imported module on the command line as advised above. 
In that case, it doesn't need to be on the import path with -I, 
since the compiler already has the relevant module on the command 
line.
2) Compile the module separately and pass the compiled object on 
the command line with the other source. In that case you still 
need to use -I to tell the compiler where to look for imported 
symbols.
3) Compile the module separately and add it with one or more 
objects to a static library. Still need -I here.

-I is just so the compiler knows where to look for imported 
modules so that it knows which symbols are available. It does not 
cause those modules to be compiled.
Mar 18 2016