Small ReleaseSafe binaries with backtraces #18520
Comments
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vaguely related #18387 |
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perhaps https://sourceware.org/gdb/current/onlinedocs/gdb.html/Separate-Debug-Files.html could also be used? |
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For TigerBeetle it’s important to ship only a single binary. I think what could work is printing only addresses “in the field”, and then correlating that back to symbols offline, but this is a much worse developer experience than just having a backtraces. |
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I would maybe highlight this part a bit more: in terms of user-visible features, that's just a part of the overall "crash reports are useful" package. Implementation wise, this is mostly unrelated to debug info stripping and requires passing |
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Wow adding |
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I see now there's also an |
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error_tracing is off by default on all modes but debug as of #18160 so not really relevant in this case |
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Pre-emptive edit: Comparing the sizes between Zig's strip option and other methods of stripping an executable, Zig's can be a lot more aggressive. I would need to learn more about how Zig strips binaries before I could know if any debug info format would make a difference. I've done a bit of research on this, and one possibility is using GNU's MiniDebugInfo format (at least on systems that use ELF, I'm not sure about other systems). It adds a I went ahead and patched the example from @matklad to add an Here are the sessions for each of the `zig-0.13 build -Dstrip=none`~/src/3_resources/matklad-repros/zig-stack-trace〉zig-0.13 build -Dstrip=none; print -e (ls ./zig-out/bin/hoyten); gdb -ex "set confirm off" -ex run -ex bt -ex quit ./zig-out/bin/hoyten
╭───┬────────────────────┬──────┬────────┬────────────────╮
│ # │ name │ type │ size │ modified │
├───┼────────────────────┼──────┼────────┼────────────────┤
│ 0 │ zig-out/bin/hoyten │ file │ 1.7 MB │ 33 minutes ago │
╰───┴────────────────────┴──────┴────────┴────────────────╯
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Reading symbols from ./zig-out/bin/hoyten...
Starting program: /home/geemili/src/3_resources/matklad-repros/zig-stack-trace/zig-out/bin/hoyten
thread 120293 panic: integer overflow
/home/geemili/src/3_resources/matklad-repros/zig-stack-trace/main.zig:4:14: 0x100a717 in foo (hoyten)
return x * x;
^
/home/geemili/src/3_resources/matklad-repros/zig-stack-trace/main.zig:9:15: 0x100a058 in bar (hoyten)
return foo(std.math.maxInt(u32));
^
/home/geemili/src/3_resources/matklad-repros/zig-stack-trace/main.zig:13:33: 0x100a048 in main (hoyten)
std.debug.print("{}", .{ bar()});
^
/home/geemili/.local/share/zigup/0.13.0/files/lib/std/start.zig:524:37: 0x100a029 in posixCallMainAndExit (hoyten)
const result = root.main() catch |err| {
^
/home/geemili/.local/share/zigup/0.13.0/files/lib/std/start.zig:266:5: 0x1009ed1 in _start (hoyten)
asm volatile (switch (native_arch) {
^
???:?:?: 0x0 in ??? (???)
Program received signal SIGABRT, Aborted.
posix.sigprocmask (flags=2, set=0x7fffffffb600, oldset=0x0) at /home/geemili/.local/share/zigup/0.13.0/files/lib/std/posix.zig:5648
5648 switch (errno(system.sigprocmask(@bitCast(flags), set, oldset))) {
#0 posix.sigprocmask (flags=2, set=0x7fffffffb600, oldset=0x0) at /home/geemili/.local/share/zigup/0.13.0/files/lib/std/posix.zig:5648
#1 posix.raise (sig=6 '\006') at /home/geemili/.local/share/zigup/0.13.0/files/lib/std/posix.zig:712
#2 0x000000000102d682 in posix.abort () at /home/geemili/.local/share/zigup/0.13.0/files/lib/std/posix.zig:654
#3 0x000000000102d0e0 in debug.panicImpl (trace=0x0, first_trace_addr=...)
at /home/geemili/.local/share/zigup/0.13.0/files/lib/std/io/Writer.zig:19
#4 0x000000000102ca5c in builtin.default_panic (error_return_trace=0x0, ret_addr=...)
at /home/geemili/.local/share/zigup/0.13.0/files/lib/std/builtin.zig:857
#5 0x000000000100a718 in main.foo (x=4294967295) at main.zig:4
#6 0x000000000100a059 in main.bar () at main.zig:9
#7 0x000000000100a049 in main.main () at main.zig:13`zig-0.13 build -Dstrip=strip`~/src/3_resources/matklad-repros/zig-stack-trace〉zig-0.13 build -Dstrip=strip; print -e (ls ./zig-out/bin/hoyten); gdb -ex "set confirm off" -ex run -ex bt -ex quit ./zig-out/bin/hoyten
╭───┬────────────────────┬──────┬─────────┬──────────╮
│ # │ name │ type │ size │ modified │
├───┼────────────────────┼──────┼─────────┼──────────┤
│ 0 │ zig-out/bin/hoyten │ file │ 21.1 KB │ now │
╰───┴────────────────────┴──────┴─────────┴──────────╯
GNU gdb (GDB) 14.2
Copyright (C) 2023 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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Reading symbols from ./zig-out/bin/hoyten...
(No debugging symbols found in ./zig-out/bin/hoyten)
Starting program: /home/geemili/src/3_resources/matklad-repros/zig-stack-trace/zig-out/bin/hoyten
Downloading separate debug info for system-supplied DSO at 0x7ffff7ffd000
thread 121522 panic: integer overflow
Unable to dump stack trace: debug info stripped
Program received signal SIGABRT, Aborted.
0x0000000001004a7b in ?? ()
#0 0x0000000001004a7b in ?? ()
#1 0x00000000010048ad in ?? ()
#2 0x00000000010044a9 in ?? ()
#3 0x0000000001002a33 in ?? ()
#4 0x00000000010024d9 in ?? ()
#5 0x00000000010024c9 in ?? ()
#6 0x00000000010024b0 in ?? ()
#7 0x0000000001002362 in ?? ()
#8 0x0000000000000001 in ?? ()
#9 0x00007fffffffc4bb in ?? ()
#10 0x0000000000000000 in ?? ()`zig-0.13 build -Dstrip=objcopy`~/src/3_resources/matklad-repros/zig-stack-trace〉zig-0.13 build -Dstrip=objcopy; print -e (ls ./zig-out/bin/hoyten); gdb -ex "set confirm off" -ex run -ex bt -ex quit ./zig-out/bin/hoyten
╭───┬────────────────────┬──────┬──────────┬──────────╮
│ # │ name │ type │ size │ modified │
├───┼────────────────────┼──────┼──────────┼──────────┤
│ 0 │ zig-out/bin/hoyten │ file │ 205.1 KB │ now │
╰───┴────────────────────┴──────┴──────────┴──────────╯
GNU gdb (GDB) 14.2
Copyright (C) 2023 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
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This GDB was configured as "x86_64-unknown-linux-gnu".
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Reading symbols from ./zig-out/bin/hoyten...
(No debugging symbols found in ./zig-out/bin/hoyten)
Starting program: /home/geemili/src/3_resources/matklad-repros/zig-stack-trace/zig-out/bin/hoyten
thread 121670 panic: integer overflow
Unwind information for `exe:0x102d286` was not available, trace may be incomplete
???:?:?: 0x100a717 in ??? (exe)
???:?:?: 0x100a058 in ??? (exe)
???:?:?: 0x100a048 in ??? (exe)
???:?:?: 0x100a029 in ??? (exe)
???:?:?: 0x1009ed1 in ??? (exe)
Program received signal SIGABRT, Aborted.
0x000000000100a890 in posix[raise] ()
#0 0x000000000100a890 in posix[raise] ()
#1 0x000000000102d682 in posix[abort] ()
#2 0x000000000102d0e0 in debug[panicImpl] ()
#3 0x000000000102ca5c in builtin.default_panic ()
#4 0x000000000100a718 in main[foo] ()
#5 0x000000000100a059 in main[bar] ()
#6 0x000000000100a049 in main.main ()`zig-0.13 build -Dstrip=llvm_objcopy`~/src/3_resources/matklad-repros/zig-stack-trace〉zig-0.13 build -Dstrip=llvm_objcopy; print -e (ls ./zig-out/bin/hoyten); gdb -ex "set confirm off" -ex run -ex bt -ex quit ./zig-out/bin/hoyten
╭───┬────────────────────┬──────┬──────────┬──────────╮
│ # │ name │ type │ size │ modified │
├───┼────────────────────┼──────┼──────────┼──────────┤
│ 0 │ zig-out/bin/hoyten │ file │ 207.4 KB │ now │
╰───┴────────────────────┴──────┴──────────┴──────────╯
GNU gdb (GDB) 14.2
Copyright (C) 2023 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
Type "show configuration" for configuration details.
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Reading symbols from ./zig-out/bin/hoyten...
(No debugging symbols found in ./zig-out/bin/hoyten)
Starting program: /home/geemili/src/3_resources/matklad-repros/zig-stack-trace/zig-out/bin/hoyten
thread 121797 panic: integer overflow
Unwind information for `exe:0x102d286` was not available, trace may be incomplete
???:?:?: 0x100a717 in ??? (exe)
???:?:?: 0x100a058 in ??? (exe)
???:?:?: 0x100a048 in ??? (exe)
???:?:?: 0x100a029 in ??? (exe)
???:?:?: 0x1009ed1 in ??? (exe)
Program received signal SIGABRT, Aborted.
0x000000000100a890 in posix[raise] ()
#0 0x000000000100a890 in posix[raise] ()
#1 0x000000000102d682 in posix[abort] ()
#2 0x000000000102d0e0 in debug[panicImpl] ()
#3 0x000000000102ca5c in builtin.default_panic ()
#4 0x000000000100a718 in main[foo] ()
#5 0x000000000100a059 in main[bar] ()
#6 0x000000000100a049 in main.main ()`zig-0.13 build -Dstrip=mini_debuginfo`~/src/3_resources/matklad-repros/zig-stack-trace〉zig-0.13 build -Dstrip=mini_debuginfo; print -e (ls ./zig-out/bin/hoyten); gdb -ex "set confirm off" -ex run -ex bt -ex quit ./zig-out/bin/hoyten
╭───┬────────────────────┬──────┬──────────┬─────────────╮
│ # │ name │ type │ size │ modified │
├───┼────────────────────┼──────┼──────────┼─────────────┤
│ 0 │ zig-out/bin/hoyten │ file │ 189.9 KB │ an hour ago │
╰───┴────────────────────┴──────┴──────────┴─────────────╯
GNU gdb (GDB) 14.2
Copyright (C) 2023 Free Software Foundation, Inc.
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This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
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Reading symbols from ./zig-out/bin/hoyten...
Reading symbols from .gnu_debugdata for /home/geemili/src/3_resources/matklad-repros/zig-stack-trace/zig-out/bin/hoyten...
(No debugging symbols found in .gnu_debugdata for /home/geemili/src/3_resources/matklad-repros/zig-stack-trace/zig-out/bin/hoyten)
Starting program: /home/geemili/src/3_resources/matklad-repros/zig-stack-trace/zig-out/bin/hoyten
thread 121889 panic: integer overflow
Unwind information for `exe:0x102d286` was not available, trace may be incomplete
???:?:?: 0x100a717 in ??? (exe)
???:?:?: 0x100a058 in ??? (exe)
???:?:?: 0x100a048 in ??? (exe)
???:?:?: 0x100a029 in ??? (exe)
???:?:?: 0x1009ed1 in ??? (exe)
Program received signal SIGABRT, Aborted.
0x000000000100a890 in posix[raise] ()
#0 0x000000000100a890 in posix[raise] ()
#1 0x000000000102d682 in posix[abort] ()
#2 0x000000000102d0e0 in debug[panicImpl] ()
#3 0x000000000102ca5c in builtin.default_panic ()
#4 0x000000000100a718 in main[foo] ()
#5 0x000000000100a059 in main[bar] ()
#6 0x000000000100a049 in main.main ()Comparison of the executable sizes:
Comparison of executable sizes using `bloaty`:
It looks like setting Edit: forget to include the changes I added to the repro [PATCH] Add mini_debuginfo option to stacktrace reproFrom 034fc41addf407524bdfbe90a6e872875d68936a Mon Sep 17 00:00:00 2001
From: geemili <[email protected]>
Date: Sun, 17 Nov 2024 13:29:50 -0700
Subject: [PATCH] Add mini_debuginfo option to stacktrace repro
---
zig-stack-trace/build.zig | 11 ++++++++++-
zig-stack-trace/mini_debuginfo.nu | 31 +++++++++++++++++++++++++++++++
2 files changed, 41 insertions(+), 1 deletion(-)
create mode 100644 zig-stack-trace/mini_debuginfo.nu
diff --git a/zig-stack-trace/build.zig b/zig-stack-trace/build.zig
index a18c2be..10c26c8 100644
--- a/zig-stack-trace/build.zig
+++ b/zig-stack-trace/build.zig
@@ -9,7 +9,7 @@ pub fn build(b: *std.Build) !void {
});
exe.root_module.omit_frame_pointer = false;
- switch (b.option(enum { strip, objcopy, llvm_objcopy, none }, "strip", "") orelse .none) {
+ switch (b.option(enum { strip, objcopy, llvm_objcopy, mini_debuginfo, none }, "strip", "") orelse .none) {
.none => b.installArtifact(exe),
.strip => {
exe.root_module.strip = true;
@@ -33,5 +33,14 @@ pub fn build(b: *std.Build) !void {
exe.out_filename,
).step);
},
+ .mini_debuginfo => {
+ const mini_debuginfo_nu = b.addSystemCommand(&.{"nu"});
+ mini_debuginfo_nu.addFileArg(b.path("./mini_debuginfo.nu"));
+ mini_debuginfo_nu.addArtifactArg(exe);
+ b.getInstallStep().dependOn(&b.addInstallBinFile(
+ mini_debuginfo_nu.addOutputFileArg(exe.out_filename),
+ exe.out_filename,
+ ).step);
+ },
}
}
diff --git a/zig-stack-trace/mini_debuginfo.nu b/zig-stack-trace/mini_debuginfo.nu
new file mode 100644
index 0000000..7769904
--- /dev/null
+++ b/zig-stack-trace/mini_debuginfo.nu
@@ -0,0 +1,31 @@
+#!/usr/bin/env nu
+
+def main [binary: string, output: string] {
+ let keep_symbols = (nm $binary --format=posix --defined-only
+ # turn into nicely formatted table
+ | lines | split column ' ' | rename symbol type address size | sort-by symbol
+ # only keep function symbols
+ | where type == 'T' or type == 't')
+
+ let keep_symbols_txt = $"($binary | path dirname)/keep_symbols.txt"
+ rm -f $keep_symbols_txt
+
+ $keep_symbols | get symbol | to text | save $keep_symbols_txt
+
+ let debuginfo = $"($binary).debuginfo"
+ let mini_debuginfo = $"($binary).mini_debuginfo"
+
+ # get just the debug info
+ objcopy --only-keep-debug $binary $debuginfo
+
+ # create reduced version of the debug info
+ objcopy -S --remove-section .gdb_index --remove-section .comment $"--keep-symbols=($keep_symbols_txt)" $debuginfo $mini_debuginfo
+
+ let stripped = $"($binary).stripped"
+ strip --strip-all -R .comment $binary -o $stripped
+
+ xz --keep $mini_debuginfo
+
+ # combine the stripped binary with the reduced, compressed debuginfo
+ objcopy --add-section $".gnu_debugdata=($mini_debuginfo).xz" $stripped $output
+}
--
2.44.1
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Ah, okay. I guess that means that the comparison would be better done on a larger project, instead of on a tiny program only meant to demonstrate if the printing works or not. |
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Experimenting on a slightly larger project, I get |
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I think We might consider adding a convenience flag such as |
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Alright, I've gotten simple backtraces working: However it currently swaps out the DWARF debug info backend entirely, so symbol names are the best you'll get in any mode. It also doesn't support the dynamic symbol table yet, it only reads from the regular symbol table. That code is living on the I think we want |
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Implemented my previous idea of using a With Dwarf Info~/code/zig/build/stage3/bin/zig build -Dstrip=none --verbose;
print -e (ls ./zig-out/bin/hoyten);
try { ./zig-out/bin/hoyten };/home/geemili/code/zig/build/stage3/bin/zig build-exe -fno-omit-frame-pointer -OReleaseSafe -Mroot=/home/geemili/Downloads/matklad-repros/zig-stack-trace/main.zig --cache-dir /home/geemili/Downloads/matklad-repros/zig-stack-trace/.zig-cache --global-cache-dir /home/geemili/.cache/zig --name hoyten --zig-lib-dir /home/geemili/code/zig/lib/ --listen=-
╭───┬────────────────────┬──────┬─────────┬───────────────╮
│ # │ name │ type │ size │ modified │
├───┼────────────────────┼──────┼─────────┼───────────────┤
│ 0 │ zig-out/bin/hoyten │ file │ 1.9 MiB │ 4 minutes ago │
╰───┴────────────────────┴──────┴─────────┴───────────────╯
thread 598365 panic: integer overflow
Unwind error at address `exe:0x101a803` (error.MissingFDE), trace may be incomplete
/home/geemili/Downloads/matklad-repros/zig-stack-trace/main.zig:4:14: 0x100be87 in foo (hoyten)
return x * x;
^
/home/geemili/Downloads/matklad-repros/zig-stack-trace/main.zig:9:15: 0x100bc98 in bar (hoyten)
return foo(std.math.maxInt(u32));
^
/home/geemili/Downloads/matklad-repros/zig-stack-trace/main.zig:13:33: 0x100bc88 in main (hoyten)
std.debug.print("{}", .{ bar()});
^
/home/geemili/code/zig/lib/std/start.zig:617:37: 0x100bbc2 in posixCallMainAndExit (hoyten)
const result = root.main() catch |err| {
^
/home/geemili/code/zig/lib/std/start.zig:248:5: 0x100b89d in _start (hoyten)
asm volatile (switch (native_arch) {
^Dwarf Info Strippedobjcopy --strip-debug ./zig-out/bin/hoyten ./zig-out/bin/hoyten-debug-stripped;
print -e (ls ./zig-out/bin/hoyten-debug-stripped);
try { ./zig-out/bin/hoyten-debug-stripped };╭───┬───────────────────────────────────┬──────┬───────────┬──────────╮
│ # │ name │ type │ size │ modified │
├───┼───────────────────────────────────┼──────┼───────────┼──────────┤
│ 0 │ zig-out/bin/hoyten-debug-stripped │ file │ 244.0 KiB │ now │
╰───┴───────────────────────────────────┴──────┴───────────┴──────────╯
thread 598380 panic: integer overflow
Unwind information for `exe:0x101a803` was not available, trace may be incomplete
???:?:?: 0x100be87 in main.foo (???)
???:?:?: 0x100bc98 in main.bar (???)
???:?:?: 0x100bc88 in main.main (???)
???:?:?: 0x100bbc2 in start.posixCallMainAndExit (???)
???:?:?: 0x100b89d in _start (???)
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i think that could/should integrate with #19650, @nektro still working on it? needing to use an external tool (and yeah ik technically zig has it builtin but its still more code) to get the small exe with bracktraces is unfortunate. maybe |
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I'll have to take a look at #19650, but at the moment I'm looking at making |
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Adding a few comments after having done some work on the pull request:
I can confirm that ~/Downloads/matklad-repros/zig-stack-trace> zig build -Dstrip=objcopy; bloaty -w -s file zig-out/bin/hoyten
FILE SIZE VM SIZE
-------------- --------------
72.9% 151Ki 74.4% 151Ki .text
12.5% 26.1Ki 12.8% 26.1Ki .rodata
5.1% 10.6Ki 0.0% 0 .strtab
4.7% 9.85Ki 4.8% 9.84Ki .eh_frame
3.4% 7.03Ki 0.0% 0 .symtab
0.7% 1.40Ki 0.7% 1.40Ki .eh_frame_hdr
0.4% 832 0.0% 0 [ELF Section Headers]
0.2% 504 0.2% 504 [ELF Program Headers]
0.1% 211 0.0% 0 .shstrtab
0.0% 64 0.0% 64 [ELF Header]
0.0% 24 0.0% 0 .comment
0.0% 8 0.0% 8 .got
0.0% 8 0.0% 8 [LOAD #1 [R]]
0.0% 0 6.1% 12.4Ki .bss
0.0% 0 1.0% 2.13Ki .relro_padding
0.0% 0 0.0% 13 .tbss
100.0% 208Ki 100.0% 204Ki TOTAL
My idea for tackling this is replacing
Although I'm not sure that would quite match what is going on: Also, most of the time people will not care what the specific debugging format is, so having some aliases like Anyway, if
This would definitely make sense to do, especially if we want to change the default backtrace in To something like this: Getting the backtraces to work only requires changing the standard library, so I'm thinking about splitting |
Problem: for TigerBetele, we want our release binary to be relatively small and self-contained, but we also want to see at least a minimal backtrace on assert faliures, overflow errors, indexing out of bounds and such.
As far as I am aware:
Specifically (non-expert, might be talking nonsense here), I think including frame pointers, and debug symbols (but not the entire of debug info) should give both a small executable, and a reasonable stack trace.
Here's a reproducible log of my experiments:
https://github.com/matklad/repros/tree/7d0c1a081d969ac040625445059dcc6574ad2bdf/zig-stack-trace
This is what I tried:
ReleaseSafe: huge binary because of debuginfo, good backtracemodule.omit_frame_pointer = false; module.strip = false;: small file, but no backtrace at alladdObjCopystep with.strip = .debug: small file, but bad backtrace:In comparison, here's what Rust gives with
strip=debuginfo:I think 3) is what I want big-picture wise, but a few details prevent it from being actually useful:
asserts, by providing our own assert using@src(), but that's also important for things like arithmertic overflowsmodule.strip = .strip_debuginfo_keep_symbols. See the repo linked above for build.zig.The text was updated successfully, but these errors were encountered: