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libsepol: cil: Add ability to redeclare types[attributes]
Modify cil_gen_node() to check to see if the cil_db supports multiple declarations, and if so, to check whether or not the repeated symbol is eligible to share the existing, already-stored datum. The only types considered so far are CIL_TYPE and CIL_TYPEATTRIBUTE, both of which intall empty datums during AST building, so they automatically return true. Test: Build policy with multilpe type and attribute declarations, and without. Policies are binary-identical. Signed-off-by: Dan Cashman <dcashman@android.com> Signed-off-by: James Carter <jwcart2@tycho.nsa.gov>
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