Re: compiling com.mysql.jdbc.Driver with gcj

[Radu Racaru <radu dot racaru at gmail dot com>]

Hi,
you need to link to the driver also, that's why the compiler says 
"undefined reference to".

Like:
gcj-4.0 --classpath=../mysql-connector-java-3.1.10-bin.jar:.
org/dcwatch/dchub/core/*.java
  org/dcwatch/dchub/util/*java org/dcwatch/sql/SqlConnection.java
ForceInclude.java
  --main=org.dcwatch.dchub.core.Core
mysql-connector-java-3.1.10-bin.jar -o faszom2.out

note that I've added the jar to the compile line, putting it in
classpath is not enough.

As an alternative you can have the driver compiled to an object file:

gcj-4.0 -c mysql-connector-java-3.1.10-bin.jar -o
mysql-connector-java-3.1.10-bin.o

then only link with it:
gcj-4.0 --classpath=../mysql-connector-java-3.1.10-bin.jar:.
org/dcwatch/dchub/core/*.java
  org/dcwatch/dchub/util/*java org/dcwatch/sql/SqlConnection.java
ForceInclude.java
  --main=org.dcwatch.dchub.core.Core mysql-connector-java-3.1.10-bin.o
-o faszom2.out


On 10/9/05, Khiraly <khiraly123@gmx.net> wrote:
> Hi!
>
> I wanted to compile my application to native code.
> My application use mysql, so I need mysql driver to compile into the
> binaries.
>
> I have tried the following method:
> 1. Create a class with include mysql driver into the native code:
> public class ForceInclude {
>         private static final Class class1 = com.mysql.jdbc.Driver.class;
>         ForceInclude() {
>         }
> }
>
> Now the compile command:
> gcj-4.0 --classpath=../mysql-connector-java-3.1.10-bin.jar:. org/dcwatch/dchub/core/*.java
> org/dcwatch/dchub/util/*java org/dcwatch/sql/SqlConnection.java ForceInclude.java
> --main=org.dcwatch.dchub.core.Core -o faszom2.out
>
> The result is this:
> /tmp/ccINcMTs.o: In function `ForceInclude::__U3c_clinit__U3e_()':
> ccqmLQg5jx:(.text+0xfc00): undefined reference to `com::mysql::jdbc::Driver::class$'
> ccqmLQg5jx:(.text+0xfc12): undefined reference to `com::mysql::jdbc::Driver::class$'
> collect2: ld returned 1 exit status
>
>
> I have found this method on the following link:
> http://www.cs.umanitoba.ca/~eclipse/6-Compiling.pdf
>
> There are others with the same problem (no result):
> http://66.249.93.104/search?q=cache:-QJ78MPiHzoJ:dbforums.com/t576436.html+gcj+com::mysql::jdbc::Driver::class%24&hl=hu&lr=lang_en|lang_hu&client=firefox
>
>
> How can I include mysql driver into my native code?
>
> Best regards,
>  Khiraly
>
>