From 8afa321b8ac7a52c479c5226364c48c544038c06 Mon Sep 17 00:00:00 2001
From: Rahul Butani <rrbutani@users.noreply.github.com>
Date: Fri, 27 Jan 2023 14:51:12 -0800
Subject: [PATCH] llvmPackages_15.llvm: add checks for the LLVM version

this is in preparation for the next commit which exposes the release
information and monorepo source as overridable args (which makes it
easier for users to use their own LLVM in nixpkgs)

this commit only adds a check in the `llvm` package's postConfigure that
makes sure the LLVM source provided matches the version we were given;
the actual machinery (functionally just a cosmetic change; causes no
rebuilds) is in the next commit
---
 .../compilers/llvm/15/llvm/default.nix        | 32 +++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/pkgs/development/compilers/llvm/15/llvm/default.nix b/pkgs/development/compilers/llvm/15/llvm/default.nix
index 40fb105cdc523..e0b79a9acfefc 100644
--- a/pkgs/development/compilers/llvm/15/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/15/llvm/default.nix
@@ -255,6 +255,38 @@ in stdenv.mkDerivation (rec {
     )
   '';
 
+  # Defensive check: some paths (that we make symlinks to) depend on the release
+  # version, for example:
+  #  - https://github.com/llvm/llvm-project/blob/406bde9a15136254f2b10d9ef3a42033b3cb1b16/clang/lib/Headers/CMakeLists.txt#L185
+  #
+  # So we want to sure that the version in the source matches the release
+  # version we were given.
+  #
+  # We do this check here, in the LLVM build, because it happens early.
+  postConfigure = let
+    v = lib.versions;
+    major = v.major release_version;
+    minor = v.minor release_version;
+    patch = v.patch release_version;
+  in ''
+    # $1: part, $2: expected
+    check_version() {
+      part="''${1^^}"
+      part="$(cat include/llvm/Config/llvm-config.h  | grep "#define LLVM_VERSION_''${part} " | cut -d' ' -f3)"
+
+      if [[ "$part" != "$2" ]]; then
+        echo >&2 \
+          "mismatch in the $1 version! we have version ${release_version}" \
+          "and expected the $1 version to be '$2'; the source has '$part' instead"
+        exit 3
+      fi
+    }
+
+    check_version major ${major}
+    check_version minor ${minor}
+    check_version patch ${patch}
+  '';
+
   # E.g. mesa.drivers use the build-id as a cache key (see #93946):
   LDFLAGS = optionalString (enableSharedLibraries && !stdenv.isDarwin) "-Wl,--build-id=sha1";