From 2a2909634efa550b04c439b69b5fa896b30b6c86 Mon Sep 17 00:00:00 2001
From: Emily <vcs@emily.moe>
Date: Sun, 10 Aug 2025 00:45:28 +0100
Subject: [PATCH] bazel_7: fix build with modern Clang on macOS
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This would also work for Bazel 6, but it’s being removed anyway.
---
 .../tools/build-managers/bazel/bazel_7/default.nix     | 10 ++++++++++
 pkgs/top-level/all-packages.nix                        |  1 -
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/tools/build-managers/bazel/bazel_7/default.nix b/pkgs/development/tools/build-managers/bazel/bazel_7/default.nix
index 4f5c45f6f464a..7cd90a1f58225 100644
--- a/pkgs/development/tools/build-managers/bazel/bazel_7/default.nix
+++ b/pkgs/development/tools/build-managers/bazel/bazel_7/default.nix
@@ -707,6 +707,16 @@ stdenv.mkDerivation rec {
   dontStrip = true;
   dontPatchELF = true;
 
+  # Work around an issue with the old vendored zlib and modern versions
+  # of Clang on macOS.
+  #
+  # Fixed in newer versions of Bazel and rules_java; see
+  # <https://github.com/bazelbuild/bazel/issues/25124>.
+  #
+  # Credit to Homebrew for the hack:
+  # <https://github.com/Homebrew/homebrew-core/blob/b61d1f7d7963c08c472d829b25de5d0a06dc4b3d/Formula/b/bazel.rb#L55-L60>
+  env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.hostPlatform.isDarwin "-fno-define-target-os-macros";
+
   passthru = {
     # TODO add some tests to cover basic functionality, and also tests for enableNixHacks=true (buildBazelPackage tests)
     # tests = ...
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index a08d4f67c496a..8deccec68a19b 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -6778,7 +6778,6 @@ with pkgs;
     inherit (darwin) sigtool;
     buildJdk = jdk21_headless;
     runJdk = jdk21_headless;
-    stdenv = if stdenv.cc.isClang then llvmPackages_17.stdenv else stdenv;
     bazel_self = bazel_7;
   };