gdc compiler/linker error

[Jason House]

Jonathan Crapuchettes wrote:

> I am getting a linker error when I try to compile my code as follows:
> 
> jonathan at blackbeard:~/workspace/ccb/matrix$ gdmd test.d Matrix.d Vector.d
> Util.d ../MySQLConnection.d -unittest -I../..
> -L/usr/lib/atlas/libptcblas.a -L/usr/lib/atlas/liblapack.a
> -L/usr/lib/atlas/libatlas.a -L/usr/lib/atlas/libcblas.a
> -L/usr/lib/atlas/libblas.a -L/usr/lib/libmysqlclient.so -vdmd
> /usr/bin/gdc -funittest -I ../.. -c test.d -o test.o
> /usr/bin/gdc -funittest -I ../.. -c Matrix.d -o Matrix.o
> /usr/bin/gdc -funittest -I ../.. -c Vector.d -o Vector.o
> /usr/bin/gdc -funittest -I ../.. -c Util.d -o Util.o
> /usr/bin/gdc -funittest -I ../.. -c ../MySQLConnection.d -o
> MySQLConnection.o /usr/bin/gdc -funittest -I ../.. test.o Matrix.o
> Vector.o Util.o MySQLConnection.o -Wl,/usr/lib/atlas/libptcblas.a
> -Wl,/usr/lib/atlas/liblapack.a -Wl,/usr/lib/atlas/libatlas.a
> -Wl,/usr/lib/atlas/libcblas.a -Wl,/usr/lib/atlas/libblas.a
> -Wl,/usr/lib/libmysqlclient.so -o test Util.o: In function
> `_D3ccb6matrix4Util11__unittest0FZv': Util.d:(.text+0x2ec4): undefined
> reference to `_D3ccb15MySQLConnection15mysqlConnection7__ClassZ'
> Util.d:(.text+0x2f22): undefined reference to
>
`_D3ccb15MySQLConnection15mysqlConnection5_ctorMFAaAaAaAaZC3ccb15MySQLConnection15mysqlConnection'
> collect2: ld returned 1 exit status
> 
> I am trying to use gdc for its 64-bit compilation, but this is a problem.
> I checked the compiled code inside MySQLConnection.o with objdump and
> found that _D3ccb15MySQLConnection15MysqlConnection7__ClassZ exists. The
> only different between this label and the one that is causing the error is
> the m in the last term. The name of the class is MysqlConnection.
> 
> I am using gdc (GCC) 4.1.3 20070831 (prerelease gdc 0.25, using dmd 1.021)
> (Ubuntu 0.25-4.1.2-16ubuntu1).
> 
> What can I do to get this is compile and link?
> 
> Thank you taking to read this,
> JC

If you pick up a d demangler and run it on the output, it'll make it easier
for others to interpret.  It may even have the unexpected side effect of
making the error obvious.