Why is the compiled file size so huge?

[Alexander Zhirov]

I'm trying to compile a file that weighs 3 kilobytes. I'm also 
linking a self-written dynamic library. I don't understand why 
the resulting executable file is so huge? After all, all 
libraries are present:

```sh
-rwxr-xr-x 1 root root 6.3M May 27 13:39 app
-rw-r--r-- 1 root root 2.9K May 27 12:57 app.d
-rw-r--r-- 1 root root  25K May 27 13:39 app.o
```

```sh
ldc2 -O app.d -L-lpq -L-lX11 -L-lXrandr -L-lm -L-lmira
```

```sh
	linux-vdso.so.1 (0x00007fff3a5bf000)
	libpq.so.5 => /usr/lib/libpq.so.5 (0x00007fe89f8a7000)
	libX11.so.6 => /usr/lib/libX11.so.6 (0x00007fe89f763000)
	libXrandr.so.2 => /usr/lib/libXrandr.so.2 (0x00007fe89f756000)
	libm.so.6 => /lib/libm.so.6 (0x00007fe89f611000)
	libmira.so => /usr/lib/libmira.so (0x00007fe89f4c7000)
	libpthread.so.0 => /lib/libpthread.so.0 (0x00007fe89f4a6000)
	librt.so.1 => /lib/librt.so.1 (0x00007fe89f499000)
	libdl.so.2 => /lib/libdl.so.2 (0x00007fe89f493000)
	libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007fe89f479000)
	libc.so.6 => /lib/libc.so.6 (0x00007fe89f2af000)
	/lib64/ld-linux-x86-64.so.2 => /lib/ld-linux-x86-64.so.2 
(0x00007fe89f91b000)
	libxcb.so.1 => /usr/lib/libxcb.so.1 (0x00007fe89f284000)
	libXau.so.6 => /usr/lib/libXau.so.6 (0x00007fe89f27f000)
	libXdmcp.so.6 => /usr/lib/libXdmcp.so.6 (0x00007fe89f275000)
	libbsd.so.0 => /usr/lib/libbsd.so.0 (0x00007fe89f25c000)
	libXext.so.6 => /usr/lib/libXext.so.6 (0x00007fe89f247000)
	libXrender.so.1 => /usr/lib/libXrender.so.1 (0x00007fe89f23a000)
	libphobos2-ldc-shared.so.99 => 
/root/dlang/ldc-1.29.0/bin/../lib/libphobos2-ldc-shared.so.99 
(0x00007fe89ed89000)
	libdruntime-ldc-shared.so.99 => 
/root/dlang/ldc-1.29.0/bin/../lib/libdruntime-ldc-shared.so.99 
(0x00007fe89ec3b000)
(dmd-2.100.0)
```