Crosstool's sanitized headers

[Trevor Harmon]

Crosstool supports "sanitized Linux headers". What exactly is a  
"sanitized" header? In what way are the original headers "dirty"? I  
was hoping to find an explanation of this in the crosstool docs or by  
searching Google, but all I can see is a changelog that the patch was  
applied.

Specifically, I'm wondering what is the purpose of specifying  
different versions for LINUX_DIR and LINUX_SANITIZED_HEADER_DIR. For  
example, gcc-3.4.4-glibc-2.3.3-hdrs-2.6.11.2.dat sets 2.6.8 for Linux  
and 2.6.11.2 for the headers. Isn't that a potential compatibility  
problem?

Also, in crosstool-0.38, many (all?) of the .dat files specify both  
LINUX_SANITIZED_HEADER_DIR and LINUX_DIR. However, crosstool issues a  
warning if both are specified and ignores LINUX_DIR (see line 43 of  
crosstool.sh). Is this a bug in the .dat files?

Trevor

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