[gmx-users] compiling on fedora

[Mark Abraham]

Joanne Hanna wrote:
> Hi
> 
> Can anyone please help! I have been trying to compile gmx 3.1.4 on pcs running fedora core 3 and 4 however I get a range of warnings during the make stage.

Unless you absolutely need back-compatibility of gromacs version for 
some reason, you'd be well advised to get a more recent version of 
gromacs. 3.2.x and 3.3 will compile out-of-the-box on FC4. My guess is 
the kinds of warnings you are seeing are the result of differences in 
gcc's treatments of these warning-level problems in this older gromacs 
code. I have no experience with 3.1.4, however. gcc can be configured to 
suppress all warnings, or specific warnings, but you'd have to look at 
the documentation for how to do that. The sorts of warnings you cite are 
suggestive of a compiler implementing a more rigorous level of checking 
than the coder anticipated.

> For fedora 4 the warnings are;
> pme.c: In function 'solve_pme':
> pme.c:306: warning: dereferencing type-punned pointer will break strict-aliasing rules
> pppm.c: In function 'convolution':
> pppm.c:380: warning: dereferencing type-punned pointer will break strict-aliasing rules
> topio.c: In function ?do_top?:
> topio.c:275: warning: ?comb? may be used uninitialized in this function
> topio.c:597: warning: ?combination_rule? may be used uninitialized in this function
> genhydro.c: In function ?add_h?:
> genhydro.c:284: warning: ?jj? may be used uninitialized in this function

<snip>

In reply to your other post, I haven't observed this compiling 3.2.1 or 
various 3.3 versions on my FC4 running gcc 4.0.1. You can work around 
them in the same way, but I find their existence weird.

Mark