From 8ede185c48e0467e0b0427e3e6bffba63ab6c784 Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Sun, 10 Aug 2025 15:04:54 -0700
Subject: [PATCH 01/15] DEPS: Bump Meson, lower pin Cython

---
 ci/deps/actions-311-minimum_versions.yaml  | 6 +++---
 ci/deps/actions-311.yaml                   | 6 +++---
 ci/deps/actions-312.yaml                   | 6 +++---
 ci/deps/actions-313-downstream_compat.yaml | 6 +++---
 ci/deps/actions-313-freethreading.yaml     | 2 +-
 ci/deps/actions-313-numpydev.yaml          | 6 +++---
 ci/deps/actions-313-pyarrownightly.yaml    | 6 +++---
 ci/deps/actions-313.yaml                   | 6 +++---
 environment.yml                            | 6 +++---
 pyproject.toml                             | 6 +++---
 requirements-dev.txt                       | 2 +-
 11 files changed, 29 insertions(+), 29 deletions(-)

diff --git a/ci/deps/actions-311-minimum_versions.yaml b/ci/deps/actions-311-minimum_versions.yaml
index f9dc5d2367344..a101498415ef8 100644
--- a/ci/deps/actions-311-minimum_versions.yaml
+++ b/ci/deps/actions-311-minimum_versions.yaml
@@ -8,9 +8,9 @@ dependencies:
 
   # build dependencies
   - versioneer
-  - cython<4.0.0a0
-  - meson=1.2.1
-  - meson-python=0.13.1
+  - cython>=3.1,<4.0.0a0
+  - meson>=1.6,<2
+  - meson-python>=0.17.1,<1
 
   # test dependencies
   - pytest>=7.3.2
diff --git a/ci/deps/actions-311.yaml b/ci/deps/actions-311.yaml
index deb646a7ba86a..51ac47a5e3bfe 100644
--- a/ci/deps/actions-311.yaml
+++ b/ci/deps/actions-311.yaml
@@ -6,9 +6,9 @@ dependencies:
 
   # build dependencies
   - versioneer
-  - cython<4.0.0a0
-  - meson=1.2.1
-  - meson-python=0.13.1
+  - cython>=3.1,<4.0.0a0
+  - meson>=1.6,<2
+  - meson-python>=0.17.1,<1
 
   # test dependencies
   - pytest>=7.3.2
diff --git a/ci/deps/actions-312.yaml b/ci/deps/actions-312.yaml
index 5a24b0c1077d0..3a79c37e880ba 100644
--- a/ci/deps/actions-312.yaml
+++ b/ci/deps/actions-312.yaml
@@ -6,9 +6,9 @@ dependencies:
 
   # build dependencies
   - versioneer
-  - cython<4.0.0a0
-  - meson=1.2.1
-  - meson-python=0.13.1
+  - cython>=3.1,<4.0.0a0
+  - meson>=1.6,<2
+  - meson-python>=0.17.1,<1
 
   # test dependencies
   - pytest>=7.3.2
diff --git a/ci/deps/actions-313-downstream_compat.yaml b/ci/deps/actions-313-downstream_compat.yaml
index c118bbcdf1697..13f46b9461983 100644
--- a/ci/deps/actions-313-downstream_compat.yaml
+++ b/ci/deps/actions-313-downstream_compat.yaml
@@ -7,9 +7,9 @@ dependencies:
 
   # build dependencies
   - versioneer
-  - cython<4.0.0a0
-  - meson=1.2.1
-  - meson-python=0.13.1
+  - cython>=3.1,<4.0.0a0
+  - meson>=1.6,<2
+  - meson-python>=0.17.1,<1
 
   # test dependencies
   - pytest>=7.3.2
diff --git a/ci/deps/actions-313-freethreading.yaml b/ci/deps/actions-313-freethreading.yaml
index e118080bc4c40..4639135ef284e 100644
--- a/ci/deps/actions-313-freethreading.yaml
+++ b/ci/deps/actions-313-freethreading.yaml
@@ -7,7 +7,7 @@ dependencies:
   # build dependencies
   - setuptools
   - versioneer
-  - cython<4.0.0a0
+  - cython>=3.1,<4.0.0a0
   - meson=1.8.0
   - meson-python=0.18.0
 
diff --git a/ci/deps/actions-313-numpydev.yaml b/ci/deps/actions-313-numpydev.yaml
index a1474d70c9487..b5b100737aca7 100644
--- a/ci/deps/actions-313-numpydev.yaml
+++ b/ci/deps/actions-313-numpydev.yaml
@@ -6,9 +6,9 @@ dependencies:
 
   # build dependencies
   - versioneer
-  - meson=1.2.1
-  - meson-python=0.13.1
-  - cython<4.0.0a0
+  - meson>=1.6,<2
+  - meson-python>=0.17.1,<1
+  - cython>=3.1,<4.0.0a0
 
   # test dependencies
   - pytest>=7.3.2
diff --git a/ci/deps/actions-313-pyarrownightly.yaml b/ci/deps/actions-313-pyarrownightly.yaml
index e56813cffb901..22310ac9a67d8 100644
--- a/ci/deps/actions-313-pyarrownightly.yaml
+++ b/ci/deps/actions-313-pyarrownightly.yaml
@@ -6,9 +6,9 @@ dependencies:
 
   # build dependencies
   - versioneer
-  - meson=1.2.1
-  - cython<4.0.0a0
-  - meson-python=0.13.1
+  - meson>=1.6,<2
+  - cython>=3.1,<4.0.0a0
+  - meson-python>=0.17.1,<1
 
   # test dependencies
   - pytest>=7.3.2
diff --git a/ci/deps/actions-313.yaml b/ci/deps/actions-313.yaml
index ffca09b901852..ed043ca08ec94 100644
--- a/ci/deps/actions-313.yaml
+++ b/ci/deps/actions-313.yaml
@@ -6,9 +6,9 @@ dependencies:
 
   # build dependencies
   - versioneer
-  - cython<4.0.0a0
-  - meson=1.2.1
-  - meson-python=0.13.1
+  - cython>=3.1,<4.0.0a0
+  - meson>=1.6,<2
+  - meson-python>=0.17.1,<1
 
   # test dependencies
   - pytest>=7.3.2
diff --git a/environment.yml b/environment.yml
index 1c7ebd0cea1ff..c2d9219c64189 100644
--- a/environment.yml
+++ b/environment.yml
@@ -8,9 +8,9 @@ dependencies:
 
   # build dependencies
   - versioneer
-  - cython<4.0.0a0
-  - meson=1.2.1
-  - meson-python=0.13.1
+  - cython>=3.1,<4.0.0a0
+  - meson>=1.6,<2
+  - meson-python>=0.17.1,<1
 
   # test dependencies
   - pytest>=7.3.2
diff --git a/pyproject.toml b/pyproject.toml
index 0ea46b92e9e01..73390924468ae 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,10 +2,10 @@
 # Minimum requirements for the build system to execute.
 # See https://github.com/scipy/scipy/pull/12940 for the AIX issue.
 requires = [
-    "meson-python>=0.13.1",
-    "meson>=1.2.1,<2",
+    "meson-python>=0.17.1,<1",
+    "meson>=1.6,<2",
     "wheel",
-    "Cython<4.0.0a0",  # Note: sync with setup.py, environment.yml and asv.conf.json
+    "Cython>=3.1,<4.0.0a0",  # Note: sync with setup.py, environment.yml and asv.conf.json
     # Force numpy higher than 2.0rc1, so that built wheels are compatible
     # with both numpy 1 and 2
     "numpy>=2.0.0rc1",
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 708aa7567a009..dc36c178368d4 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -3,7 +3,7 @@
 
 pip
 versioneer[toml]
-cython<4.0.0a0
+cython>=3.1,<4.0.0a0
 meson[ninja]==1.2.1
 meson-python==0.13.1
 pytest>=7.3.2

From d5b978b0dd1f96677fd91c1dd84d18d092115e8c Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Sun, 10 Aug 2025 15:11:06 -0700
Subject: [PATCH 02/15] Update meson in requirements-dev.txt

---
 requirements-dev.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/requirements-dev.txt b/requirements-dev.txt
index dc36c178368d4..106d395e3d065 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -4,8 +4,8 @@
 pip
 versioneer[toml]
 cython>=3.1,<4.0.0a0
-meson[ninja]==1.2.1
-meson-python==0.13.1
+meson[ninja]>=1.6,<2
+meson-python>=0.17.1,<1
 pytest>=7.3.2
 pytest-cov
 pytest-xdist>=3.4.0

From 29dda9f68fa30d20a27c84963f498ec976498071 Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Mon, 11 Aug 2025 10:42:31 -0700
Subject: [PATCH 03/15] ingore unused-parameter

---
 .github/actions/build_pandas/action.yml | 11 ++++-------
 .github/workflows/unit-tests.yml        |  3 ---
 2 files changed, 4 insertions(+), 10 deletions(-)

diff --git a/.github/actions/build_pandas/action.yml b/.github/actions/build_pandas/action.yml
index 2d208cb38725a..4bb54efd7371c 100644
--- a/.github/actions/build_pandas/action.yml
+++ b/.github/actions/build_pandas/action.yml
@@ -4,9 +4,6 @@ inputs:
   editable:
     description: Whether to build pandas in editable mode (default true)
     default: true
-  werror:
-    description: Enable werror flag for build
-    default: true
 runs:
   using: composite
   steps:
@@ -26,12 +23,12 @@ runs:
       shell: bash -el {0}
 
     - name: Build Pandas
+      # wno-error reason: https://github.com/cython/cython/issues/6870
       run: |
         if [[ ${{ inputs.editable }} == "true" ]]; then
-          pip install -e . --no-build-isolation -v --no-deps \
-            ${{ inputs.werror == 'true' && '-Csetup-args="--werror"' || '' }}
+          EDITABLE="-e"
         else
-          pip install . --no-build-isolation -v --no-deps \
-            ${{ inputs.werror == 'true' && '-Csetup-args="--werror"' || '' }}
+          EDITABLE=""
         fi
+        pip install $EDITABLE . --no-build-isolation -v --no-deps -Csetup-args="-Werror" -Csetup-args="-Wno-error=unused-parameter"
       shell: bash -el {0}
diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index 46490fa324009..16cf06a98c9ae 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -160,9 +160,6 @@ jobs:
     - name: Build Pandas
       id: build
       uses: ./.github/actions/build_pandas
-      with:
-        # xref https://github.com/cython/cython/issues/6870
-        werror: ${{ matrix.name != 'Freethreading' }}
 
     - name: Test (not single_cpu)
       uses: ./.github/actions/run-tests

From 4d57c82f8c69e7d8ffcd838f1d30aad32f457ff5 Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Mon, 11 Aug 2025 11:01:54 -0700
Subject: [PATCH 04/15] use wheel command?

---
 .github/actions/build_pandas/action.yml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/.github/actions/build_pandas/action.yml b/.github/actions/build_pandas/action.yml
index 4bb54efd7371c..08c4da292ca2d 100644
--- a/.github/actions/build_pandas/action.yml
+++ b/.github/actions/build_pandas/action.yml
@@ -30,5 +30,6 @@ runs:
         else
           EDITABLE=""
         fi
-        pip install $EDITABLE . --no-build-isolation -v --no-deps -Csetup-args="-Werror" -Csetup-args="-Wno-error=unused-parameter"
+        pip wheel $EDITABLE --no-build-isolation -v --no-deps --config-settings=setup-args="-Werror" --config-settings=setup-args="-Wno-error=unused-parameter" --wheel-dir=/tmp/wheelhouse .
+        pip install --no-index --find-links=/tmp/wheelhouse pandas
       shell: bash -el {0}

From c3cc3df02ec01caf810646ec220f4bbce929a746 Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Mon, 11 Aug 2025 11:05:19 -0700
Subject: [PATCH 05/15]  got back to pip install version

---
 .github/actions/build_pandas/action.yml | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/.github/actions/build_pandas/action.yml b/.github/actions/build_pandas/action.yml
index 08c4da292ca2d..4bb54efd7371c 100644
--- a/.github/actions/build_pandas/action.yml
+++ b/.github/actions/build_pandas/action.yml
@@ -30,6 +30,5 @@ runs:
         else
           EDITABLE=""
         fi
-        pip wheel $EDITABLE --no-build-isolation -v --no-deps --config-settings=setup-args="-Werror" --config-settings=setup-args="-Wno-error=unused-parameter" --wheel-dir=/tmp/wheelhouse .
-        pip install --no-index --find-links=/tmp/wheelhouse pandas
+        pip install $EDITABLE . --no-build-isolation -v --no-deps -Csetup-args="-Werror" -Csetup-args="-Wno-error=unused-parameter"
       shell: bash -el {0}

From 02c7a1a8cccbcaa626f0c810c08401fe180e7bf7 Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Mon, 11 Aug 2025 11:09:12 -0700
Subject: [PATCH 06/15] Try this?

---
 .github/actions/build_pandas/action.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/actions/build_pandas/action.yml b/.github/actions/build_pandas/action.yml
index 4bb54efd7371c..47bdc5973c20e 100644
--- a/.github/actions/build_pandas/action.yml
+++ b/.github/actions/build_pandas/action.yml
@@ -30,5 +30,5 @@ runs:
         else
           EDITABLE=""
         fi
-        pip install $EDITABLE . --no-build-isolation -v --no-deps -Csetup-args="-Werror" -Csetup-args="-Wno-error=unused-parameter"
+        pip install $EDITABLE . --no-build-isolation -v --no-deps --config-settings=setup-args="-Werror" --config-settings=setup-args="-Wno-error=unused-parameter"
       shell: bash -el {0}

From b2d36a06c1c0c9be6dc0cf92c5a303b4d1a1df69 Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Wed, 13 Aug 2025 09:12:51 -0700
Subject: [PATCH 07/15] unbump meson

---
 ci/deps/actions-311-minimum_versions.yaml  | 2 +-
 ci/deps/actions-311.yaml                   | 2 +-
 ci/deps/actions-312.yaml                   | 2 +-
 ci/deps/actions-313-downstream_compat.yaml | 2 +-
 ci/deps/actions-313-numpydev.yaml          | 2 +-
 ci/deps/actions-313-pyarrownightly.yaml    | 2 +-
 ci/deps/actions-313.yaml                   | 2 +-
 environment.yml                            | 2 +-
 pyproject.toml                             | 2 +-
 requirements-dev.txt                       | 2 +-
 10 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/ci/deps/actions-311-minimum_versions.yaml b/ci/deps/actions-311-minimum_versions.yaml
index a804afb335741..f6a58e9e82fd6 100644
--- a/ci/deps/actions-311-minimum_versions.yaml
+++ b/ci/deps/actions-311-minimum_versions.yaml
@@ -9,7 +9,7 @@ dependencies:
   # build dependencies
   - versioneer
   - cython>=3.1,<4.0.0a0
-  - meson>=1.6,<2
+  - meson>=1.2.1,<2
   - meson-python>=0.17.1,<1
 
   # test dependencies
diff --git a/ci/deps/actions-311.yaml b/ci/deps/actions-311.yaml
index 0b9911a2e9f20..82d2911f52bd5 100644
--- a/ci/deps/actions-311.yaml
+++ b/ci/deps/actions-311.yaml
@@ -7,7 +7,7 @@ dependencies:
   # build dependencies
   - versioneer
   - cython>=3.1,<4.0.0a0
-  - meson>=1.6,<2
+  - meson>=1.2.1,<2
   - meson-python>=0.17.1,<1
 
   # test dependencies
diff --git a/ci/deps/actions-312.yaml b/ci/deps/actions-312.yaml
index 48c7a1433dddd..adf93733906bc 100644
--- a/ci/deps/actions-312.yaml
+++ b/ci/deps/actions-312.yaml
@@ -7,7 +7,7 @@ dependencies:
   # build dependencies
   - versioneer
   - cython>=3.1,<4.0.0a0
-  - meson>=1.6,<2
+  - meson>=1.2.1,<2
   - meson-python>=0.17.1,<1
 
   # test dependencies
diff --git a/ci/deps/actions-313-downstream_compat.yaml b/ci/deps/actions-313-downstream_compat.yaml
index 3145675977133..8fa5b03b65c95 100644
--- a/ci/deps/actions-313-downstream_compat.yaml
+++ b/ci/deps/actions-313-downstream_compat.yaml
@@ -8,7 +8,7 @@ dependencies:
   # build dependencies
   - versioneer
   - cython>=3.1,<4.0.0a0
-  - meson>=1.6,<2
+  - meson>=1.2.1,<2
   - meson-python>=0.17.1,<1
 
   # test dependencies
diff --git a/ci/deps/actions-313-numpydev.yaml b/ci/deps/actions-313-numpydev.yaml
index b5b100737aca7..99034c827beee 100644
--- a/ci/deps/actions-313-numpydev.yaml
+++ b/ci/deps/actions-313-numpydev.yaml
@@ -6,7 +6,7 @@ dependencies:
 
   # build dependencies
   - versioneer
-  - meson>=1.6,<2
+  - meson>=1.2.1,<2
   - meson-python>=0.17.1,<1
   - cython>=3.1,<4.0.0a0
 
diff --git a/ci/deps/actions-313-pyarrownightly.yaml b/ci/deps/actions-313-pyarrownightly.yaml
index 22310ac9a67d8..b8728c13626f5 100644
--- a/ci/deps/actions-313-pyarrownightly.yaml
+++ b/ci/deps/actions-313-pyarrownightly.yaml
@@ -6,7 +6,7 @@ dependencies:
 
   # build dependencies
   - versioneer
-  - meson>=1.6,<2
+  - meson>=1.2.1,<2
   - cython>=3.1,<4.0.0a0
   - meson-python>=0.17.1,<1
 
diff --git a/ci/deps/actions-313.yaml b/ci/deps/actions-313.yaml
index 9a3c8d26d06d7..fe9a573741b70 100644
--- a/ci/deps/actions-313.yaml
+++ b/ci/deps/actions-313.yaml
@@ -7,7 +7,7 @@ dependencies:
   # build dependencies
   - versioneer
   - cython>=3.1,<4.0.0a0
-  - meson>=1.6,<2
+  - meson>=1.2.1,<2
   - meson-python>=0.17.1,<1
 
   # test dependencies
diff --git a/environment.yml b/environment.yml
index ba56711702abe..9a4e662a51851 100644
--- a/environment.yml
+++ b/environment.yml
@@ -9,7 +9,7 @@ dependencies:
   # build dependencies
   - versioneer
   - cython>=3.1,<4.0.0a0
-  - meson>=1.6,<2
+  - meson>=1.2.1,<2
   - meson-python>=0.17.1,<1
 
   # test dependencies
diff --git a/pyproject.toml b/pyproject.toml
index 32f4872d0a142..16462daf84c13 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,7 +3,7 @@
 # See https://github.com/scipy/scipy/pull/12940 for the AIX issue.
 requires = [
     "meson-python>=0.17.1,<1",
-    "meson>=1.6,<2",
+    "meson>=1.2.1,<2",
     "wheel",
     "Cython>=3.1,<4.0.0a0",  # Note: sync with setup.py, environment.yml and asv.conf.json
     # Force numpy higher than 2.0rc1, so that built wheels are compatible
diff --git a/requirements-dev.txt b/requirements-dev.txt
index c99c4f28678fb..e6802353ed291 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -4,7 +4,7 @@
 pip
 versioneer[toml]
 cython>=3.1,<4.0.0a0
-meson[ninja]>=1.6,<2
+meson[ninja]>=1.2.1,<2
 meson-python>=0.17.1,<1
 pytest>=7.3.2
 pytest-cov

From e71250bfcf05ff314d4c55c0ad0d0110a74428ab Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Wed, 13 Aug 2025 09:16:02 -0700
Subject: [PATCH 08/15] Add unused-parameter to meson build instead

---
 .github/actions/build_pandas/action.yml | 3 +--
 meson.build                             | 6 ++++++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/.github/actions/build_pandas/action.yml b/.github/actions/build_pandas/action.yml
index 47bdc5973c20e..a84eedbe7203f 100644
--- a/.github/actions/build_pandas/action.yml
+++ b/.github/actions/build_pandas/action.yml
@@ -23,12 +23,11 @@ runs:
       shell: bash -el {0}
 
     - name: Build Pandas
-      # wno-error reason: https://github.com/cython/cython/issues/6870
       run: |
         if [[ ${{ inputs.editable }} == "true" ]]; then
           EDITABLE="-e"
         else
           EDITABLE=""
         fi
-        pip install $EDITABLE . --no-build-isolation -v --no-deps --config-settings=setup-args="-Werror" --config-settings=setup-args="-Wno-error=unused-parameter"
+        pip install $EDITABLE . --no-build-isolation -v --no-deps -Ccompile-args="-Werror"
       shell: bash -el {0}
diff --git a/meson.build b/meson.build
index 6a00e52481108..3cb6bcecfbab2 100644
--- a/meson.build
+++ b/meson.build
@@ -44,6 +44,12 @@ else
     meson.add_dist_script(py, versioneer, '-o', '_version_meson.py')
 endif
 
+cc = meson.get_compiler('c')
+add_project_arguments(
+# https://github.com/cython/cython/issues/6870
+    cc.get_supported_arguments(['-Wno-error=unused-parameter']),
+    language: 'c',
+)
 cy = meson.get_compiler('cython')
 if cy.version().version_compare('>=3.1.0')
     add_project_arguments('-Xfreethreading_compatible=true', language: 'cython')

From 5deb5d9939caeae751a1a6775ac6e5f2a1f00f1b Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Wed, 13 Aug 2025 09:38:40 -0700
Subject: [PATCH 09/15] Use csetup-args

---
 .github/actions/build_pandas/action.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/actions/build_pandas/action.yml b/.github/actions/build_pandas/action.yml
index a84eedbe7203f..ed8dd989316a7 100644
--- a/.github/actions/build_pandas/action.yml
+++ b/.github/actions/build_pandas/action.yml
@@ -29,5 +29,5 @@ runs:
         else
           EDITABLE=""
         fi
-        pip install $EDITABLE . --no-build-isolation -v --no-deps -Ccompile-args="-Werror"
+        pip install $EDITABLE . --no-build-isolation -v --no-deps -Csetup-args="-Werror"
       shell: bash -el {0}

From 4f6f5f9face5673e599e618b91b81f9d9f7fbee9 Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Wed, 13 Aug 2025 10:02:05 -0700
Subject: [PATCH 10/15] Update .github/actions/build_pandas/action.yml

Co-authored-by: William Ayd <william.ayd@icloud.com>
---
 .github/actions/build_pandas/action.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/actions/build_pandas/action.yml b/.github/actions/build_pandas/action.yml
index ed8dd989316a7..786ad5895ac5a 100644
--- a/.github/actions/build_pandas/action.yml
+++ b/.github/actions/build_pandas/action.yml
@@ -29,5 +29,5 @@ runs:
         else
           EDITABLE=""
         fi
-        pip install $EDITABLE . --no-build-isolation -v --no-deps -Csetup-args="-Werror"
+        pip install $EDITABLE . --no-build-isolation -v --no-deps -Csetup-args="--werror"
       shell: bash -el {0}

From 20b55a678a51c0413ba6d28e495525031453d9f4 Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Wed, 13 Aug 2025 10:45:53 -0700
Subject: [PATCH 11/15] Update meson.build

Co-authored-by: William Ayd <william.ayd@icloud.com>
---
 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meson.build b/meson.build
index 3cb6bcecfbab2..bb7d0d3c84ea0 100644
--- a/meson.build
+++ b/meson.build
@@ -47,7 +47,7 @@ endif
 cc = meson.get_compiler('c')
 add_project_arguments(
 # https://github.com/cython/cython/issues/6870
-    cc.get_supported_arguments(['-Wno-error=unused-parameter']),
+    cc.get_supported_arguments(['-Wno-error=unused-parameter', '-Wno-error=unused-function']),
     language: 'c',
 )
 cy = meson.get_compiler('cython')

From 930715b253c3af843944f6e490bf17106809e793 Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Wed, 13 Aug 2025 14:20:21 -0700
Subject: [PATCH 12/15] Add another unused-function?

---
 pandas/_libs/meson.build | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/pandas/_libs/meson.build b/pandas/_libs/meson.build
index 33fc65e5034d0..4230ae7afbcce 100644
--- a/pandas/_libs/meson.build
+++ b/pandas/_libs/meson.build
@@ -50,6 +50,15 @@ _khash_primitive_helper_dep = declare_dependency(
     sources: _khash_primitive_helper,
 )
 
+cc = meson.get_compiler('c')
+add_project_arguments(
+# https://github.com/cython/cython/issues/6870
+    cc.get_supported_arguments(
+        ['-Wno-error=unused-parameter', '-Wno-error=unused-function'],
+    ),
+    language: 'c',
+)
+
 cdata = configuration_data()
 if cy.version().version_compare('>=3.1.0')
     cdata.set('freethreading_compatible', '1')

From 42fd72c0d4df9a413ce0e2bd3d9029fd94e2c49b Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Wed, 13 Aug 2025 14:28:08 -0700
Subject: [PATCH 13/15] Revert "Add another unused-function?"

This reverts commit 930715b253c3af843944f6e490bf17106809e793.
---
 pandas/_libs/meson.build | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/pandas/_libs/meson.build b/pandas/_libs/meson.build
index 4230ae7afbcce..33fc65e5034d0 100644
--- a/pandas/_libs/meson.build
+++ b/pandas/_libs/meson.build
@@ -50,15 +50,6 @@ _khash_primitive_helper_dep = declare_dependency(
     sources: _khash_primitive_helper,
 )
 
-cc = meson.get_compiler('c')
-add_project_arguments(
-# https://github.com/cython/cython/issues/6870
-    cc.get_supported_arguments(
-        ['-Wno-error=unused-parameter', '-Wno-error=unused-function'],
-    ),
-    language: 'c',
-)
-
 cdata = configuration_data()
 if cy.version().version_compare('>=3.1.0')
     cdata.set('freethreading_compatible', '1')

From 20efb844a796ba1c4fd6992db77bffd9e1bcf663 Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Thu, 14 Aug 2025 08:50:28 -0700
Subject: [PATCH 14/15] format meson.build

---
 meson.build | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/meson.build b/meson.build
index bb7d0d3c84ea0..d607d9dcf7041 100644
--- a/meson.build
+++ b/meson.build
@@ -47,7 +47,9 @@ endif
 cc = meson.get_compiler('c')
 add_project_arguments(
 # https://github.com/cython/cython/issues/6870
-    cc.get_supported_arguments(['-Wno-error=unused-parameter', '-Wno-error=unused-function']),
+    cc.get_supported_arguments(
+        ['-Wno-error=unused-parameter', '-Wno-error=unused-function'],
+    ),
     language: 'c',
 )
 cy = meson.get_compiler('cython')

From b7a9f9877725b25507c01b1a342d4fd36619c4f0 Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Thu, 14 Aug 2025 08:56:02 -0700
Subject: [PATCH 15/15] Add __init__.py in templates directory

---
 pandas/io/formats/templates/__init__.py | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 pandas/io/formats/templates/__init__.py

diff --git a/pandas/io/formats/templates/__init__.py b/pandas/io/formats/templates/__init__.py
new file mode 100644
index 0000000000000..e69de29bb2d1d