Upgrade nixpkgs

This gives us GHC 9.0.2 and a new Bazel release.

changelog_begin
changelog_end

deps.bzl

@@ -220,27 +220,15 @@ def daml_deps():
         # This should be kept in sync with the grpc version we get from Nix.
         http_archive(
             name = "com_github_grpc_grpc",
-            strip_prefix = "grpc-1.42.0",
-            urls = ["https://github.com/grpc/grpc/archive/v1.42.0.tar.gz"],
-            sha256 = "b2f2620c762427bfeeef96a68c1924319f384e877bc0e084487601e4cc6e434c",
+            strip_prefix = "grpc-1.43.0",
+            urls = ["https://github.com/grpc/grpc/archive/v1.43.0.tar.gz"],
+            sha256 = "9647220c699cea4dafa92ec0917c25c7812be51a18143af047e20f3fb05adddc",
             patches = [
                 "@com_github_digital_asset_daml//bazel_tools:grpc-bazel-mingw.patch",
             ],
             patch_args = ["-p1"],
         )
 
-    if "com_google_absl" not in native.existing_rules():
-        http_archive(
-            name = "com_google_absl",
-            sha256 = "35f22ef5cb286f09954b7cc4c85b5a3f6221c9d4df6b8c4a1e9d399555b366ee",
-            strip_prefix = "abseil-cpp-997aaf3a28308eba1b9156aa35ab7bca9688e9f6",
-            urls = [
-                "https://storage.googleapis.com/grpc-bazel-mirror/github.com/abseil/abseil-cpp/archive/997aaf3a28308eba1b9156aa35ab7bca9688e9f6.tar.gz",
-                "https://github.com/abseil/abseil-cpp/archive/997aaf3a28308eba1b9156aa35ab7bca9688e9f6.tar.gz",
-            ],
-            patch_args = ["-p1"],
-        )
-
     if "com_google_protobuf" not in native.existing_rules():
         http_archive(
             name = "com_google_protobuf",

nix/nixpkgs/default.src.json

@@ -1,6 +1,6 @@
 {
   "owner": "NixOS",
   "repo": "nixpkgs",
-  "rev": "a7ecde854aee5c4c7cd6177f54a99d2c1ff28a31",
-  "sha256": "162dywda2dvfj1248afxc45kcrg83appjd0nmdb541hl7rnncf02"
+  "rev": "defafc9a220440180a34f923be9772d9c89a8197",
+  "sha256": "1s6cf4yxzszwl8qgfsr0y0hr1dw1pawwk3nbryi0phri1npvaggj"
 }

nix/tools/bazel-cc-toolchain/default.nix

@@ -2,7 +2,7 @@
 , binutils
 , buildEnv
 , darwin
-, llvmPackages
+, llvmPackages_7
 , makeWrapper
 , overrideCC
 , runCommand
@@ -14,6 +14,9 @@
 # https://github.com/NixOS/nixpkgs/pull/41589.
 let cc-darwin =
   with darwin.apple_sdk.frameworks;
+  # Note (MK): For now we pin to clang 7 since newer versions fail to build abseil.
+  let stdenv = llvmPackages_7.stdenv;
+  in
   runCommand "cc-wrapper-bazel"
   {
     buildInputs = [ stdenv.cc makeWrapper ];
@@ -33,12 +36,12 @@ let cc-darwin =
     makeWrapper ${stdenv.cc}/bin/cc $out/bin/cc \
       --add-flags "-Wno-unused-command-line-argument \
                    -mmacosx-version-min=10.14 \
-                   -isystem ${llvmPackages.libcxx}/include/c++/v1 \
+                   -isystem ${llvmPackages_7.libcxx}/include/c++/v1 \
                    -F${CoreFoundation}/Library/Frameworks \
                    -F${CoreServices}/Library/Frameworks \
                    -F${Security}/Library/Frameworks \
                    -F${Foundation}/Library/Frameworks \
-                   -L${llvmPackages.libcxx}/lib \
+                   -L${llvmPackages_7.libcxx}/lib \
                    -L${darwin.libobjc}/lib"
   '';