Re: Numeric suffixes on symbols

[Nicholas Sherlock <n dot sherlock at gmail dot com>]

Michael Morrell wrote:
> I'm building some code that I want to make sure produces the same bits each
> time.  I ran into a case where the only difference between the result from
> two different compilation is the names of some of the symbols.
>
> For example, I may see the symbol name:
>
>   __PRETTY_FUNCTION__.20638
>
> in the first build, and then:
>
>   __PRETTY_FUNCTION__.20694
>
> in the second build.

I'm not sure if it will solve your problem, but GCC has a command-line 
option for setting the random seed it uses to generate at least some 
symbol names:

-frandom-seed=string
    This option provides a seed that GCC uses when it would otherwise 
use random numbers. It is used to generate certain symbol names that 
have to be different in every compiled file. It is also used to place 
unique stamps in coverage data files and the object files that produce 
them. You can use the -frandom-seed option to produce reproducibly 
identical object files.

    The string should be different for every file you compile.

http://gcc.gnu.org/onlinedocs/gcc/Debugging-Options.html

Cheers,
Nicholas Sherlock