checksum files not ^C safe

[Geoffrey Keating]

On 14/09/2005, at 5:32 PM, Mike Stump wrote:

> These types of rules are not ^C safe:
>
> cc1-checksum.c : cc1-dummy$(exeext) build/genchecksum$(build_exeext)
>         build/genchecksum$(build_exeext) cc1-dummy$(exeext) > $@
>
> It is a general property that builds are ^C safe, the above changes  
> retard that feature.
>
> If you output to a temp file, and then mv them to the final file,  
> they will be (I think) safe.

 From the 'make' documentation, node 'Interrupts':

>    If `make' gets a fatal signal while a command is executing, it may
> delete the target file that the command was supposed to update.   
> This is
> done if the target file's last-modification time has changed since
> `make' first checked it.

So, I think this is safe.  The file will be deleted and then re-built  
next time you run 'make'.
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