Tracking ci.yml changes from master.

Author: rwgk

.github/workflows/ci_sh_def.yml

@@ -930,8 +930,7 @@ jobs:
           - { sys: mingw64, env: x86_64 }
           - { sys: mingw32, env: i686 }
     steps:
-    # Force version because of https://github.com/msys2/setup-msys2/issues/167
-    - uses: msys2/[email protected]
+    - uses: msys2/setup-msys2@v2
       with:
         msystem: ${{matrix.sys}}
         install: >-
@@ -961,10 +960,10 @@ jobs:
       run: cmake --build build --target pytest -j 2
 
     - name: C++11 tests
-      run: cmake --build build --target cpptest -j 2
+      run: PYTHONHOME=/${{matrix.sys}} PYTHONPATH=/${{matrix.sys}} cmake --build build --target cpptest -j 2
 
     - name: Interface test C++11
-      run: cmake --build build --target test_cmake_build
+      run: PYTHONHOME=/${{matrix.sys}} PYTHONPATH=/${{matrix.sys}} cmake --build build --target test_cmake_build
 
     - name: Clean directory
       run: git clean -fdx
@@ -979,10 +978,10 @@ jobs:
       run: cmake --build build2 --target pytest -j 2
 
     - name: C++14 tests
-      run: cmake --build build2 --target cpptest -j 2
+      run: PYTHONHOME=/${{matrix.sys}} PYTHONPATH=/${{matrix.sys}} cmake --build build2 --target cpptest -j 2
 
     - name: Interface test C++14
-      run: cmake --build build2 --target test_cmake_build
+      run: PYTHONHOME=/${{matrix.sys}} PYTHONPATH=/${{matrix.sys}} cmake --build build2 --target test_cmake_build
 
     - name: Clean directory
       run: git clean -fdx
@@ -997,7 +996,7 @@ jobs:
       run: cmake --build build3 --target pytest -j 2
 
     - name: C++17 tests
-      run: cmake --build build3 --target cpptest -j 2
+      run: PYTHONHOME=/${{matrix.sys}} PYTHONPATH=/${{matrix.sys}} cmake --build build3 --target cpptest -j 2
 
     - name: Interface test C++17
-      run: cmake --build build3 --target test_cmake_build
+      run: PYTHONHOME=/${{matrix.sys}} PYTHONPATH=/${{matrix.sys}} cmake --build build3 --target test_cmake_build

.github/workflows/ci_sh_def.yml.patch

@@ -1,5 +1,5 @@
---- ci.yml	2022-01-25 16:47:53.830999786 -0800
-+++ ci_sh_def.yml	2022-01-25 16:48:45.714550945 -0800
+--- ci.yml	2022-01-26 09:58:21.687199720 -0800
++++ ci_sh_def.yml	2022-01-26 09:58:52.261291935 -0800
 @@ -1,4 +1,16 @@
 -name: CI
 +# PLEASE KEEP THIS GROUP OF FILES IN SYNC AT ALL TIMES:
@@ -156,7 +156,7 @@
 
      steps:
      - uses: actions/checkout@v2
-@@ -927,7 +952,7 @@
+@@ -926,7 +951,7 @@
      - name: Configure C++11
        # LTO leads to many undefined reference like
        # `pybind11::detail::function_call::function_call(pybind11::detail::function_call&&)
@@ -165,7 +165,7 @@
 
      - name: Build C++11
        run: cmake --build build -j 2
-@@ -945,7 +970,7 @@
+@@ -944,7 +969,7 @@
        run: git clean -fdx
 
      - name: Configure C++14
@@ -174,7 +174,7 @@
 
      - name: Build C++14
        run: cmake --build build2 -j 2
-@@ -963,7 +988,7 @@
+@@ -962,7 +987,7 @@
        run: git clean -fdx
 
      - name: Configure C++17