From 70c2f444e35d0909e334a6e2be27bd4fead81e44 Mon Sep 17 00:00:00 2001
From: John Ericson <John.Ericson@Obsidian.Systems>
Date: Thu, 20 Jun 2024 18:09:58 -0400
Subject: [PATCH] llvmPackages.bintuils: Hack ranlib to ignore `-t`

Old versions of libtool for OpenBSD insist on adding the `-t` flag to
ranlib, which updates the timestamp. llvm-ranlib does not support `-t`
and as no plans to do so [1], since it makes builds less reproducable.
OpenBSD upstream deals with this by patching ranlib to ignore the `-t`
flag [2].

Instead of writing patches for all LLVM versions or re-running `autoreconf`
on all packages that use libtool, we can wrap ranlib to ignore the flag.

[1]: https://github.com/llvm/llvm-project/issues/57129
[2]: https://github.com/openbsd/src/commit/d00990cc11fce25520b9dde416bb8cf50990e992
---
 pkgs/build-support/bintools-wrapper/default.nix  | 12 ++++++++++++
 .../bintools-wrapper/llvm-ranlib-wrapper.sh      | 16 ++++++++++++++++
 2 files changed, 28 insertions(+)
 create mode 100644 pkgs/build-support/bintools-wrapper/llvm-ranlib-wrapper.sh

diff --git a/pkgs/build-support/bintools-wrapper/default.nix b/pkgs/build-support/bintools-wrapper/default.nix
index 736494b5ee55d..3ead71ebb6988 100644
--- a/pkgs/build-support/bintools-wrapper/default.nix
+++ b/pkgs/build-support/bintools-wrapper/default.nix
@@ -382,6 +382,18 @@ stdenvNoCC.mkDerivation {
       substituteAll ${./add-darwin-ldflags-before.sh} $out/nix-support/add-local-ldflags-before.sh
     ''
 
+    ##
+    ## LLVM ranlab lacks -t option that libtool expects. We can just
+    ## skip it
+    ##
+
+    + optionalString (isLLVM && targetPlatform.isOpenBSD) ''
+      rm $out/bin/${targetPrefix}ranlib
+      wrap \
+        ${targetPrefix}ranlib ${./llvm-ranlib-wrapper.sh} \
+        "${bintools_bin}/bin/${targetPrefix}ranlib"
+    ''
+
     ##
     ## Extra custom steps
     ##
diff --git a/pkgs/build-support/bintools-wrapper/llvm-ranlib-wrapper.sh b/pkgs/build-support/bintools-wrapper/llvm-ranlib-wrapper.sh
new file mode 100644
index 0000000000000..730424ce92e2d
--- /dev/null
+++ b/pkgs/build-support/bintools-wrapper/llvm-ranlib-wrapper.sh
@@ -0,0 +1,16 @@
+#! @shell@
+# shellcheck shell=bash
+
+args=()
+for p in "$@"; do
+    case "$p" in
+        -t)
+            # Skip, LLVM ranlib doesn't support
+            ;;
+        *)
+            args+=("$p")
+            ;;
+    esac
+done
+
+@prog@ "${args[@]}"