bug#24139: gdbm is not bit-reproducible

[Ludovic Courtès]

Looks like an embedded timestamp:

--8<---------------cut here---------------start------------->8---
$ diff -ru --no-dereference 
/gnu/store/8pskv4xpdjg1grx3c2an3g5fqj8pcrgh-gdbm-1.12{,-check}
Binary files 
/gnu/store/8pskv4xpdjg1grx3c2an3g5fqj8pcrgh-gdbm-1.12/lib/libgdbm.a and 
/gnu/store/8pskv4xpdjg1grx3c2an3g5fqj8pcrgh-gdbm-1.12-check/lib/libgdbm.a differ
Binary files 
/gnu/store/8pskv4xpdjg1grx3c2an3g5fqj8pcrgh-gdbm-1.12/lib/libgdbm.so.4.0.0 and 
/gnu/store/8pskv4xpdjg1grx3c2an3g5fqj8pcrgh-gdbm-1.12-check/lib/libgdbm.so.4.0.0
 differ
$ git describe
v0.11.0-2-g8aceca5
$ diffoscope /gnu/store/8pskv4xpdjg1grx3c2an3g5fqj8pcrgh-gdbm-1.12{,-check}/lib
--- /gnu/store/8pskv4xpdjg1grx3c2an3g5fqj8pcrgh-gdbm-1.12/lib
+++ /gnu/store/8pskv4xpdjg1grx3c2an3g5fqj8pcrgh-gdbm-1.12-check/lib

[...]

├── libgdbm.a
│┄ xxd not available in path. Falling back to Python hexlify.

│┄ No differences found inside, yet data differs
│ @@ -2892,15 +2892,15 @@
│  2020302020202020202020202020302020202020302020202020363434202020
│  202031373834202020202020600a7f454c460201010000000000000000000100
│  3e00010000000000000000000000000000000000000038030000000000000000
│  000040000000000040000f000c008b163917b8010000007f2d7c238b4e04394f
│  047f237c198b4e08394f087f190f9cc00fb6c0f7d8c30f1f840000000000b8ff
│  ffffff0f1f00f3c30000000000000000000000000000010000000c0000000000
│  0000000000004744424d2076657273696f6e20312e31322e2031362f30352f32
│ -30313620286275696c74204a756e20313320323031362032313a32343a323729
│ +30313620286275696c742041756720203320323031362030393a30363a353729
│  00004743433a2028474e552920342e392e33000000001400000000000000017a
│  5200017810011b0c070890010000140000001c000000000000003a0000000000
│  000000000000002e73796d746162002e737472746162002e7368737472746162
│  002e74657874002e72656c612e64617461002e627373002e746578742e756e6c
│  696b656c79002e726f64617461002e726f646174612e737472312e38002e636f
│  6d6d656e74002e6e6f74652e474e552d737461636b002e72656c612e65685f66
│  72616d6500000000000000000000000000000000000000000000000000000000

[...]

├── libgdbm.so.4.0.0
│   ├── readelf --wide --hex-dump=.rodata {}
│   │ @@ -98,10 +98,10 @@
│   │    0x00008c30 7778797a 30313233 34353637 38392b2f wxyz0123456789+/
│   │    0x00008c40 00636f75 6c646e27 7420696e 69742063 .couldn't init c
│   │    0x00008c50 61636865 006d616c 6c6f6320 6661696c ache.malloc fail
│   │    0x00008c60 65640067 64626d20 66617461 6c3a2025 ed.gdbm fatal: %
│   │    0x00008c70 730a0000 01000000 0c000000 00000000 s...............
│   │    0x00008c80 4744424d 20766572 73696f6e 20312e31 GDBM version 1.1
│   │    0x00008c90 322e2031 362f3035 2f323031 36202862 2. 16/05/2016 (b
│   │ -  0x00008ca0 75696c74 204a756e 20313320 32303136 uilt Jun 13 2016
│   │ -  0x00008cb0 2032313a 32343a32 37290000 00000000  21:24:27)......
│   │ +  0x00008ca0 75696c74 20417567 20203320 32303136 uilt Aug  3 2016
│   │ +  0x00008cb0 2030393a 30363a35 37290000 00000000  09:06:57)......
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Ludo’.