5.5.3 Automatic Customization for a Directory
AUCTeX can update the style information about a file each time you save it if TeX-auto-save option is enabled. Saved information will be stored in the directory TeX-auto-local, set to '"auto"' by default.
The advantage of doing this is that macros, labels, etc. defined in any file in a multifile document will be known in all the files in the document. The disadvantage is that saving will be slower. To disable, set TeX-auto-local to nil.
User Option: TeX-style-local
Directory containing hand generated TeX information.
These correspond to TeX macros found in the current directory.
User Option: TeX-auto-local
Directory containing automatically generated TeX information.
These correspond to TeX macros found in the current directory.
User Option: TeX-auto-save-aggregate
When non-nil, save parsed information in auto subdirectory of master directory.
Otherwise, save in each auto subdirectory of the parsed file.
Subdirectory name is actually taken from TeX-auto-local.