Compiling in Debugging Flags

[Chris Maness]

Bill Moran wrote:
> In response to Chris Maness <chris at chrismaness.com>:
>
>   
>>> Then, ensure the sysctls in the kernel are all frobbed to allow coredumps.
>>> Specifically:
>>> kern.coredump: 1
>>> kern.sugid_coredump: 1
>>>       
>> What is frobbed?
>>     
>
> http://en.wikipedia.org/wiki/Frob
>
> You need to learn important things like this if you're going to get
> anywhere in this business ...
>
>   
sysctl -a | grep core
kern.corefile: %N.core
kern.nodump_coredump: 0
kern.coredump: 1
kern.sugid_coredump: 0
<6>pid 36665 (conftest), uid 0: exited on signal 11 (core dumped)
<6>pid 97013 (httpd), uid 0: exited on signal 11 (core dumped)
<6>pid 48143 (conftest), uid 0: exited on signal 12 (core dumped)
<6>pid 69261 (httpd), uid 0: exited on signal 11 (core dumped)
<6>pid 30477 (httpd), uid 0: exited on signal 11 (core dumped)
<6>pid 17468 (httpd), uid 0: exited on signal 11 (core dumped)
<6>pid 72511 (httpd), uid 0: exited on signal 11 (core dumped)
<6>pid 88618 (httpd), uid 0: exited on signal 11 (core dumped)
<6>pid 91921 (httpd), uid 0: exited on signal 11 (core dumped)
<6>pid 48962 (httpd), uid 0: exited on signal 11 (core dumped)
<6>pid 96510 (httpd), uid 0: exited on signal 11 (core dumped)
debug.elf32_legacy_coredump: 0

How do I change the the values?  Also, where do the files go by default?