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digitalmars.D.learn - error linking to my own custom module

reply Sean Fennell <fennellstyle gmail.com> writes:
I'm very green to D, just learning it now.
I have a module that I wrote.  Its pretty simple, just helper functions to get
input from user as certain data types
GetInt()
GetString()
GetChar()
etc...

I compiled the module using dmd -lib mymod.d which output mymod.a

Now I've imported my module into ask.d to test it and I get the folliowing
linking error when I try to compile:

ask.o:(.data+0x4c): undefined reference to `_D4mymod12__ModuleInfoZ`
My dir structure looks like this:

project/
---ask.d
---lib/
------mymod.d
------mymod.a

and my import line is:

import lib.mymod;

Anyone seen this before? Using linux dmd v2.036

Thanks!
Nov 10 2009
parent reply torhu <no spam.invalid> writes:
On 11.11.2009 04:57, Sean Fennell wrote:
 I'm very green to D, just learning it now.
 I have a module that I wrote.  Its pretty simple, just helper functions to get
input from user as certain data types
 GetInt()
 GetString()
 GetChar()
 etc...

 I compiled the module using dmd -lib mymod.d which output mymod.a

 Now I've imported my module into ask.d to test it and I get the folliowing
linking error when I try to compile:

 ask.o:(.data+0x4c): undefined reference to `_D4mymod12__ModuleInfoZ`
 My dir structure looks like this:

 project/
 ---ask.d
 ---lib/
 ------mymod.d
 ------mymod.a

 and my import line is:

 import lib.mymod;

 Anyone seen this before? Using linux dmd v2.036

 Thanks!
You have to hand all the files to the compiler, otherwise there will be missing symbols when the compiler runs the linker. Like this: dmd ask lib/mymod Compiling to a library first, like you did, will work too. But you have to hand the compiler everything when you want to create the actual executable: dmd ask lib/mymod.a There are build tools, like dsss, that will automate this for you.
Nov 10 2009
parent reply "Lars T. Kyllingstad" <public kyllingen.NOSPAMnet> writes:
torhu wrote:
 On 11.11.2009 04:57, Sean Fennell wrote:
 I'm very green to D, just learning it now.
 I have a module that I wrote.  Its pretty simple, just helper 
 functions to get input from user as certain data types
 GetInt()
 GetString()
 GetChar()
 etc...

 I compiled the module using dmd -lib mymod.d which output mymod.a

 Now I've imported my module into ask.d to test it and I get the 
 folliowing linking error when I try to compile:

 ask.o:(.data+0x4c): undefined reference to `_D4mymod12__ModuleInfoZ`
 My dir structure looks like this:

 project/
 ---ask.d
 ---lib/
 ------mymod.d
 ------mymod.a

 and my import line is:

 import lib.mymod;

 Anyone seen this before? Using linux dmd v2.036

 Thanks!
You have to hand all the files to the compiler, otherwise there will be missing symbols when the compiler runs the linker. Like this: dmd ask lib/mymod Compiling to a library first, like you did, will work too. But you have to hand the compiler everything when you want to create the actual executable: dmd ask lib/mymod.a There are build tools, like dsss, that will automate this for you.
I've found rdmd to be a very useful program. It will track down all imports in your program and feed the relevant files to the compiler. Here are some examples: To compile and run your program: rdmd ask To compile, but not run your program: rdmd --build-only ask Actually, I tend to just put a shebang line in my main D source file and mark it as executable: ask.d: #!/path/to/rdmd --shebang import lib.mymod; ... Then, after you make changes to your program and want to test it, you just run ./ask.d. :) Note that rdmd only creates a temporary executable, so it's more of a testing tool than a build tool. -Lars
Nov 11 2009
parent Sean Fennell <fennellstyle gmail.com> writes:
Lars T. Kyllingstad Wrote:

 torhu wrote:
 On 11.11.2009 04:57, Sean Fennell wrote:
 I'm very green to D, just learning it now.
 I have a module that I wrote.  Its pretty simple, just helper 
 functions to get input from user as certain data types
 GetInt()
 GetString()
 GetChar()
 etc...

 I compiled the module using dmd -lib mymod.d which output mymod.a

 Now I've imported my module into ask.d to test it and I get the 
 folliowing linking error when I try to compile:

 ask.o:(.data+0x4c): undefined reference to `_D4mymod12__ModuleInfoZ`
 My dir structure looks like this:

 project/
 ---ask.d
 ---lib/
 ------mymod.d
 ------mymod.a

 and my import line is:

 import lib.mymod;

 Anyone seen this before? Using linux dmd v2.036

 Thanks!
You have to hand all the files to the compiler, otherwise there will be missing symbols when the compiler runs the linker. Like this: dmd ask lib/mymod Compiling to a library first, like you did, will work too. But you have to hand the compiler everything when you want to create the actual executable: dmd ask lib/mymod.a There are build tools, like dsss, that will automate this for you.
I've found rdmd to be a very useful program. It will track down all imports in your program and feed the relevant files to the compiler. Here are some examples: To compile and run your program: rdmd ask To compile, but not run your program: rdmd --build-only ask Actually, I tend to just put a shebang line in my main D source file and mark it as executable: ask.d: #!/path/to/rdmd --shebang import lib.mymod; ... Then, after you make changes to your program and want to test it, you just run ./ask.d. :) Note that rdmd only creates a temporary executable, so it's more of a testing tool than a build tool. -Lars
Thank you both. Both options worked for me and I'm happily compiling.
Nov 11 2009