Currently, files that omit the \file directive and all functions, enums,
structs lacking a doxygen style comment are completely missing from the doxygen
API docs.
Set EXTRACT_ALL = YES so that all files and code items are at least listed in
the doxygen API.
Change-Id: I39f558ec0a33a61a1fcec0554f53c8e7668733de
When building out-of-srcdir, paths such as "src/gsm" will not find any
source files. Since the Doxyfiles are preprocessed, we can prepend
@srcdir@ to fix that.
Signed-off-by: Alex Badea <vamposdecampos@gmail.com>