From 2078b721de488dc598b22b1a1140c472ee84d3c9 Mon Sep 17 00:00:00 2001
From: Lisandro Dalcin <dalcinl@gmail.com>
Date: Thu, 19 Oct 2023 16:38:50 +0300
Subject: [PATCH] WIP: Refactor Windows DLL path handling

---
 .cibw/merge-wheels.py          |  4 ++++
 .cibw/mpi4py_mpiabi.py         | 38 ++++++++++++++++++++++++++++++++++
 .github/workflows/cd-wheel.yml | 18 ++++++++--------
 3 files changed, 51 insertions(+), 9 deletions(-)

diff --git a/.cibw/merge-wheels.py b/.cibw/merge-wheels.py
index 81de692..0a68e8d 100644
--- a/.cibw/merge-wheels.py
+++ b/.cibw/merge-wheels.py
@@ -142,6 +142,10 @@ def wheel_tagline(tags: list[str]) -> str:
             fh.write("# Register MPI ABI variants\n")
         for variant in variant_registry:
             fh.write(f"_mpiabi._register({variant!r})\n")
+        mpi_pth = root_dir / "mpi.pth"
+        if mpi_pth.exists():
+            fh.write("_mpiabi._bootstrap_windows()\n")
+            mpi_pth.unlink()
 
     output_dir.mkdir(parents=True, exist_ok=True)
     wheel_pack.pack(root_dir, output_dir, None)
diff --git a/.cibw/mpi4py_mpiabi.py b/.cibw/mpi4py_mpiabi.py
index 00188ec..836ea36 100644
--- a/.cibw/mpi4py_mpiabi.py
+++ b/.cibw/mpi4py_mpiabi.py
@@ -226,3 +226,41 @@ def find_spec(cls, fullname, path, target=None):
 def _install_finder():
     if _Finder not in sys.meta_path:
         sys.meta_path.append(_Finder)
+
+
+def _bootstrap_windows():
+    dllpath = []
+
+    def add(root, *subdir, dll=""):
+        path = os.path.join(root, *subdir)
+        dll = os.path.join(path, dll)
+        if os.path.exists(dll):
+            dllpath.append(path)
+
+    I_MPI_ROOT = os.environ.get("I_MPI_ROOT")
+    if I_MPI_ROOT:
+        library_kind = (
+            os.environ.get("I_MPI_LIBRARY_KIND") or
+            os.environ.get("library_kind") or
+            "release"
+        )
+        ofi_internal = os.environ.get("I_MPI_OFI_LIBRARY_INTERNAL")
+        if ofi_internal not in ("0", "no", "off", "disable"):
+            add(I_MPI_ROOT, "libfabric", "bin", dll="libfabric.dll")
+            add(I_MPI_ROOT, "bin", "libfabric", dll="libfabric.dll")
+        add(I_MPI_ROOT, "bin", library_kind, dll="impi.dll")
+        add(I_MPI_ROOT, "bin", dll="impi.dll")
+
+    MSMPI_BIN = os.environ.get("MSMPI_BIN")
+    if I_MPI_ROOT:
+        add(MSMPI_BIN, dll="msmpi.dll")
+
+    if hasattr(os, "add_dll_directory"):
+        for entry in dllpath:
+            os.add_dll_directory(entry)
+    else:
+        ospath = os.environ["PATH"].split(os.path.pathsep)
+        for entry in dllpath:
+            if entry not in ospath:
+                ospath.append(entry)
+        os.environ["PATH"] = os.path.pathsep.join(ospath)
diff --git a/.github/workflows/cd-wheel.yml b/.github/workflows/cd-wheel.yml
index 142c40c..d432afc 100644
--- a/.github/workflows/cd-wheel.yml
+++ b/.github/workflows/cd-wheel.yml
@@ -334,16 +334,16 @@ jobs:
         *NT*-impi_rt)
           I_MPI_ROOT=$(cygpath -w "$CONDA_PREFIX/Library")
           echo "I_MPI_ROOT=$I_MPI_ROOT"      >> $GITHUB_ENV
-          echo "$I_MPI_ROOT\\bin"            >> $GITHUB_PATH
-          echo "$I_MPI_ROOT\\bin\\libfabric" >> $GITHUB_PATH
+          #echo "$I_MPI_ROOT\\bin"            >> $GITHUB_PATH
+          #echo "$I_MPI_ROOT\\bin\\libfabric" >> $GITHUB_PATH
           ;;
         *NT*-msmpi)
           MSMPI_ROOT=$(cygpath -w "$CONDA_PREFIX/Library")
           echo "MSMPI_BIN=$MSMPI_ROOT\\bin"     >> $GITHUB_ENV
-          echo "MSMPI_INC=$MSMPI_ROOT\\include" >> $GITHUB_ENV
-          echo "MSMPI_LIB64=$MSMPI_ROOT\\lib"   >> $GITHUB_ENV
-          echo "$MSMPI_BIN"                     >> $GITHUB_PATH
-          ;;
+          #echo "MSMPI_INC=$MSMPI_ROOT\\include" >> $GITHUB_ENV
+          #echo "MSMPI_LIB64=$MSMPI_ROOT\\lib"   >> $GITHUB_ENV
+          #echo "$MSMPI_BIN"                     >> $GITHUB_PATH
+          #;;
         esac
 
     - run: python -m pip install mpi4py --no-index --find-links=dist
@@ -413,7 +413,7 @@ jobs:
         mpiexec: ${{steps.user.outputs.mpiexec }}
       env:
         PYTHONUSERBASE: ${{ runner.temp }}/user
-        I_MPI_FABRICS: shm
+        #I_MPI_FABRICS: shm
 
     - if: ${{ matrix.mpi == 'impi' }}
       id: venv
@@ -442,8 +442,8 @@ jobs:
       with:
         python: ${{ steps.venv.outputs.python }}
         mpiexec: ${{steps.venv.outputs.mpiexec }}
-      env:
-        I_MPI_FABRICS: shm
+      #env:
+      #  I_MPI_FABRICS: shm
 
     - uses: mpi4py/setup-mpi@v1
       with: