/usr/lib/x86_64-linux-gnu/ada/adalib/gnatvsn/rident.ali is in libgnatvsn8-dev 8-20180414-1ubuntu2.
This file is owned by root:root, with mode 0o444.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | V "GNAT Lib v8"
A -nostdinc
A -O2
A -fPIC
A -gnatn
A -g
A -mtune=generic
A -march=x86-64
P ZX
RN
RV NO_IMPLICIT_LOOPS
RV NO_ELABORATION_CODE
RV SPARK_05
U rident%s rident.ads 27e30df3 EE OO PK
W system%s system.ads system.ali
W system.rident%s
D rident.ads 20180114104846 770cd2d0 rident%s
D system.ads 20180114104845 4635ec04 system%s
D s-rident.ads 20180114104845 50efdf23 system.rident%s
X 1 rident.ads
49K9*Rident[3|75]
X 2 system.ads
37K9*System 1|47r6 49r23 2|156e11
X 3 s-rident.ads
75k16*Rident 1|47w13 49r30 3|643e18
|