Builds are no longer reproducible #13919
Description
Zig Version
0.10.0
Steps to Reproduce and Observed Behavior
const std = @import("std");
pub fn main() void {
std.debug.print("{any}", .{1});
}Building that code file multiple times with release results in different binaries every time:
❯ rm main ; zig build-exe -O ReleaseSafe main.zig && mv main main1 && shasum -a 256 main1
89d9955ed3278f2e3094d895bf6edc35ea99fdcf9a451a79566fdb9d9c38ef6b main1
❯ rm main ; zig build-exe -O ReleaseSafe main.zig && mv main main2 && shasum -a 256 main2
0ce290b125384145b8ef40471c74a6e2befe2bb29bc1a26db93fb55ca6dd4a91 main2Upon a diff inspection, the difference is minimal and consistently In these same locations:
git diff --no-index =(hexdump -C main1) =(hexdump -C main2)diff --git a/tmp/zshvBoeFg b/tmp/zshy7Dwt7
index 9f7964d..8ba3816 100644
--- a/tmp/zshvBoeFg
+++ b/tmp/zshy7Dwt7
@@ -101,7 +101,7 @@
00000640 00 00 00 00 00 00 00 00 32 00 00 00 20 00 00 00 |........2... ...|
00000650 01 00 00 00 00 00 0d 00 00 00 0d 00 01 00 00 00 |................|
00000660 03 00 00 00 00 00 00 00 1b 00 00 00 18 00 00 00 |................|
-00000670 ef ee 6b d6 b6 c7 2c 65 41 c1 12 47 6d f0 c9 ff |..k...,eA..Gm...|
+00000670 b2 56 49 d3 1d c2 36 c5 1a dc d6 a6 1a 91 41 12 |.VI...6.......A.|
00000680 0c 00 00 00 38 00 00 00 18 00 00 00 02 00 00 00 |....8...........|
00000690 00 00 27 05 00 00 01 00 2f 75 73 72 2f 6c 69 62 |..'...../usr/lib|
000006a0 2f 6c 69 62 53 79 73 74 65 6d 2e 42 2e 64 79 6c |/libSystem.B.dyl|
@@ -9556,7 +9556,7 @@
00027d60 0d 19 00 00 0e 0c 00 00 0c 61 02 00 01 00 00 00 |.........a......|
00027d70 1e 19 00 00 64 00 00 00 00 00 00 00 00 00 00 00 |....d...........|
00027d80 20 19 00 00 64 00 00 00 00 00 00 00 00 00 00 00 | ...d...........|
-00027d90 25 19 00 00 66 00 01 00 50 20 98 63 00 00 00 00 |%...f...P .c....|
+00027d90 25 19 00 00 66 00 01 00 5e 20 98 63 00 00 00 00 |%...f...^ .c....|
00027da0 00 00 00 00 2e 01 00 00 c0 06 00 00 01 00 00 00 |................|
00027db0 26 00 00 00 24 01 00 00 c0 06 00 00 01 00 00 00 |&...$...........|
00027dc0 00 00 00 00 24 00 00 00 30 00 00 00 00 00 00 00 |....$...0.......|This build is on macOS arm64.
Expected Behavior
According to https://ziglang.org/documentation/master/#Build-Mode the ReleaseSafe and other release builds are Reproducible builds.