Issues with LD when using GCC in a C program

[Marcus Clyne <eugaia@xxxxxxxxx>]

Hi,

I'm writing a C program which calls gcc using execl().

I have successfully called gcc to create an object file, but when I try 
to create the shared object file, I get problems with ld.

The error I'm getting is:
------------------
/usr/lib/gcc/i486-linux-gnu/4.2.4/../../../../lib/crt1.o: In function 
`_start':
(.text+0x18): undefined reference to `main'
collect2: ld returned 1 exit status
------------------

I have added a PATH and LD_LIBRARY_PATH in the evironment, but this 
doesn't solve the problem.

The relevant code is:
-------------------
setenv ("PATH", 
"/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games", 
1);
setenv ("LD_LIBRARY_PATH", 
"/usr/local/lib:/usr/lib:/lib:/lib/tls/i686/cmov", 1);


// compile the shared object

execl ("/usr/bin/gcc",
          "-shared",
          "-lmylib",
          "-o",
          so_file,
          object_file,
          NULL);
-------------------

Where so_file and object_file are NULL-terminated char*'s, and the 
object_file has been created.

I can successfully compile the files using gcc from my shell, and ld is 
located at /usr/bin/ld.

I'm guessing that I need to add something to my env, or perhaps to the 
gcc options, but I'm not quite sure what.


Can anyone help?

Thanks,

Marcus Clyne.