From 9e3daa1107a66f311a8367395a33ed5fc5d5e73d Mon Sep 17 00:00:00 2001
From: Shantanu <12621235+hauntsaninja@users.noreply.github.com>
Date: Sun, 5 Nov 2023 18:29:37 -0800
Subject: [PATCH] Fix arm wheels on macOS (#4017)

---
 .github/workflows/pypi_upload.yml |  7 ++++---
 CHANGES.md                        |  2 ++
 pyproject.toml                    | 13 ++++++++++++-
 3 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/pypi_upload.yml b/.github/workflows/pypi_upload.yml
index a57013d67c1..07273f09508 100644
--- a/.github/workflows/pypi_upload.yml
+++ b/.github/workflows/pypi_upload.yml
@@ -68,9 +68,10 @@ jobs:
       - name: generate matrix (PR)
         if: github.event_name == 'pull_request'
         run: |
-          cibuildwheel --print-build-identifiers --platform linux \
-          | pyp 'json.dumps({"only": x, "os": "ubuntu-latest"})' \
-          | pyp 'json.dumps(list(map(json.loads, lines)))' > /tmp/matrix
+          {
+            cibuildwheel --print-build-identifiers --platform linux \
+            | pyp 'json.dumps({"only": x, "os": "ubuntu-latest"})'
+          } | pyp 'json.dumps(list(map(json.loads, lines)))' > /tmp/matrix
         env:
           CIBW_BUILD: "cp38-* cp311-*"
           CIBW_ARCHS_LINUX: x86_64
diff --git a/CHANGES.md b/CHANGES.md
index 5ce37943693..97084a2bfc1 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -38,6 +38,8 @@
 
 <!-- Changes that improve Black's performance. -->
 
+- Fix mypyc builds on arm64 on macOS (#4017)
+
 ### Output
 
 <!-- Changes to Black's terminal output and error messages -->
diff --git a/pyproject.toml b/pyproject.toml
index f3689bfb746..c0302d2302a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -113,6 +113,8 @@ exclude = ["/profiling"]
 [tool.hatch.build.targets.wheel]
 only-include = ["src"]
 sources = ["src"]
+# Note that we change the behaviour of this flag below
+macos-max-compat = true
 
 [tool.hatch.build.targets.wheel.hooks.mypyc]
 enable-by-default = false
@@ -175,9 +177,18 @@ before-build = [
 HATCH_BUILD_HOOKS_ENABLE = "1"
 MYPYC_OPT_LEVEL = "3"
 MYPYC_DEBUG_LEVEL = "0"
+AIOHTTP_NO_EXTENSIONS = "1"
+
 # Black needs Clang to compile successfully on Linux.
 CC = "clang"
-AIOHTTP_NO_EXTENSIONS = "1"
+
+[tool.cibuildwheel.macos]
+build-frontend = { name = "build", args = ["--no-isolation"] }
+# Unfortunately, hatch doesn't respect MACOSX_DEPLOYMENT_TARGET
+before-build = [
+    "python -m pip install 'hatchling==1.18.0' hatch-vcs hatch-fancy-pypi-readme 'hatch-mypyc>=0.16.0' 'mypy==1.5.1' 'click==8.1.3'",
+    """sed -i '' -e "600,700s/'10_16'/os.environ['MACOSX_DEPLOYMENT_TARGET'].replace('.', '_')/" $(python -c 'import hatchling.builders.wheel as h; print(h.__file__)') """,
+]
 
 [tool.isort]
 atomic = true