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Your process that generates the clock is also triggered by the clock, which won't work. It's a bit like the chicken-and-egg problem ;)
You should have two processes, one to generate the clock, and another one that triggers on it:
Clockgen: process
begin
clock <= not clock after 10 ns; --will give 50MHz clock
end process;
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This does not have to be inside a process, as it is a simple 1 line statement.
Also, remember do not put this kind of code in your synthesisable code. Keep them separate as a testbench and a counter. If you put this code in and tried to synthesise it you'll some odd things getting generated.
Honored Contributor
