maint: add Windows on ARM64 support

.github/workflows/buildwheel.yml

@@ -10,7 +10,14 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-22.04, ubuntu-22.04-arm, windows-2022, macos-15-intel, macos-14]
+        os: [
+          ubuntu-22.04,
+          ubuntu-22.04-arm,
+          windows-2022,
+          windows-11-arm,
+          macos-15-intel,
+          macos-14,
+        ]
 
     steps:
       - uses: actions/checkout@v6.0.1
@@ -22,7 +29,12 @@ jobs:
       - uses: msys2/setup-msys2@v2.29.0
         with:
           msystem: mingw64
-        if: ${{ startsWith( matrix.os , 'windows' ) }}
+        if: ${{ matrix.os == 'windows-2022' }}
+
+      - uses: msys2/setup-msys2@v2.29.0
+        with:
+          msystem: clangarm64
+        if: ${{ matrix.os == 'windows-11-arm' }}
 
         # Install pkgconfig on Windows from choco rather than from msys and
         # avoid using the Strawberry one.
@@ -34,11 +46,30 @@ jobs:
       - run: echo "PKG_CONFIG_PATH=${{ github.workspace }}/.local/lib/pkgconfig" >> $env:GITHUB_ENV
         if: ${{ startsWith( matrix.os , 'windows' ) }}
 
-      - name: Build wheels
+        # We need to set these environment variables here rather than
+        # pyproject.toml so we can use differnt values for different
+        # architectures. For non-Windows this is just done with $(uname -m)
+        # don't know what that would do in msys2 on Windows when cibuildwheel
+        # parses it.
+
+      - name: Build wheels for windows-2022
+        uses: pypa/cibuildwheel@63fd63b352a9a8bdcc24791c9dbee952ee9a8abc # v3.3.0
+        if: ${{ matrix.os == 'windows-2022' }}
+        env:
+          CIBW_BEFORE_ALL_WINDOWS: msys2 -c bin/cibw_before_all_windows_amd64.sh
+
+      - name: Build wheels for windows-11-arm
         uses: pypa/cibuildwheel@63fd63b352a9a8bdcc24791c9dbee952ee9a8abc # v3.3.0
+        if: ${{ matrix.os == 'windows-11-arm' }}
         env:
-          # override setting in pyproject.toml to use msys2 instead of msys64 bash
-          CIBW_BEFORE_ALL_WINDOWS: msys2 -c bin/cibw_before_all_windows.sh
+          CIBW_BEFORE_ALL_WINDOWS: msys2 -c bin/cibw_before_all_windows_arm64.sh
+
+        # After all the Windows-specific steps above this is what actually
+        # builds the wheels for every other OS:
+
+      - name: Build wheels for any other OS
+        uses: pypa/cibuildwheel@63fd63b352a9a8bdcc24791c9dbee952ee9a8abc # v3.3.0
+        if: ${{ !startsWith( matrix.os , 'windows' ) }}
 
       - uses: actions/upload-artifact@v5
         with:
@@ -78,6 +109,7 @@ jobs:
           ubuntu-24.04-arm,
           windows-2022,
           windows-2025,
+          windows-11-arm,
           macos-15-intel,
           macos-14,
           macos-15,

bin/build_dependencies_unix.sh

@@ -18,6 +18,8 @@ set -o errexit
 
 SKIP_GMP=no
 SKIP_MPFR=no
+FAT_GMP_ARG="--enable-fat"
+PATCH_LDD=no
 
 USE_GMP=gmp
 PATCH_GMP_ARM64=no
@@ -37,6 +39,8 @@ do
       echo "  --host <HOST>     - set the host (target) for GMP build"
       echo "  --skip-gmp        - skip building GMP"
       echo "  --skip-mpfr       - skip building MPFR"
+      echo "  --disable-fat     - disable building fat binaries"
+      echo "  --patch-ldd       - patch flint to work with ldd (for mingw on arm64)"
       echo
       echo "Legacy options:"
       echo "  --gmp gmp         - build based on GMP (default)"
@@ -83,6 +87,11 @@ do
       SKIP_MPFR=yes
       shift
     ;;
+    --disable-fat)
+      # Disable building fat binaries
+      FAT_GMP_ARG="--disable-assembly"
+      shift
+    ;;
     --patch-gmp-arm64)
       # Needed only for GMP 6.2.1 on OSX arm64 (Apple M1) hardware
       # As of GMP 6.3.0 this patch is no longer needed
@@ -94,6 +103,11 @@ do
       PATCH_GMP_C23=yes
       shift
     ;;
+    --patch-ldd)
+      # Needed only for GMP 6.3.0 on OSX arm64 (Apple M1) hardware
+      PATCH_LDD=yes
+      shift
+    ;;
     --use-gmp-github-mirror)
       USE_GMP_GITHUB_MIRROR=yes
       shift
@@ -190,7 +204,7 @@ if [ $USE_GMP = "gmp" ]; then
       ./configfsf.guess
 
       ./configure --prefix=$PREFIX\
-        --enable-fat\
+        $FAT_GMP_ARG\
         --enable-shared=yes\
         --enable-static=no\
         --host=$HOST_ARG
@@ -309,6 +323,15 @@ echo
 curl -O -L https://github.com/flintlib/flint/releases/download/v$FLINTVER/flint-$FLINTVER.tar.gz
 tar xf flint-$FLINTVER.tar.gz
 cd flint-$FLINTVER
+
+  if [ $PATCH_LDD = "yes" ]; then
+    echo
+    echo --------------------------------------------
+    echo "           patching FLINT"
+    echo --------------------------------------------
+    patch -N -Z -p1 < ../../../bin/patch-ldd.diff
+  fi
+
   ./bootstrap.sh
   ./configure --prefix=$PREFIX\
     --host=$HOST_ARG\

bin/cibw_before_all_windows_arm64.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+set -o errexit
+
+pacman -S --noconfirm \
+    mingw-w64-clang-aarch64-toolchain\
+    mingw-w64-clang-aarch64-tools-git\
+    m4\
+    make\
+    base-devel\
+    autoconf-wrapper\
+    automake-wrapper\
+    libtool\
+    git\
+    #
+
+bin/build_dependencies_unix.sh \
+    --disable-fat\
+    --use-gmp-github-mirror\
+    --patch-C23\
+    --patch-ldd\
+    #

bin/patch-ldd.diff

@@ -0,0 +1,36 @@
+diff --git a/Makefile.in b/Makefile.in
+index 0f25aa2b5..937fffa10 100644
+--- a/Makefile.in
++++ b/Makefile.in
+@@ -416,14 +416,7 @@ endif
+ ifneq ($(SHARED), 0)
+ shared: $(FLINT_DIR)/$(FLINT_LIB_FULL)
+
+-# The following is to avoid reaching the maximum length of command line
+-# arguments, mainly present on MinGW.
+-define xxx_merged_lobj_rule
+-$(BUILD_DIR)/$(1)_merged.lo: $($(1)_LOBJS) | $(BUILD_DIR)
+-	@$(LD) -r $($(1)_LOBJS) -o $(BUILD_DIR)/$(1)_merged.lo
+-endef
+-$(foreach dir, $(DIRS), $(eval $(call xxx_merged_lobj_rule,$(dir))))
+-MERGED_LOBJS:=$(foreach dir, $(DIRS),$(BUILD_DIR)/$(dir)_merged.lo)
++MERGED_LOBJS:=$(foreach dir,$(DIRS),$($(dir)_LOBJS))
+
+ $(FLINT_DIR)/$(FLINT_LIB_FULL): $(MERGED_LOBJS)
+ 	@echo "Building $(FLINT_LIB_FULL)"
+@@ -437,14 +430,7 @@ endif
+ ifneq ($(STATIC), 0)
+ static: $(FLINT_DIR)/$(FLINT_LIB_STATIC)
+
+-# The following is to avoid reaching the maximum length of command line
+-# arguments, mainly present on MinGW.
+-define xxx_merged_obj_rule
+-$(BUILD_DIR)/$(1)_merged.o: $($(1)_OBJS) | $(BUILD_DIR)
+-	@$(LD) -r $($(1)_OBJS) -o $(BUILD_DIR)/$(1)_merged.o
+-endef
+-$(foreach dir, $(DIRS), $(eval $(call xxx_merged_obj_rule,$(dir))))
+-MERGED_OBJS:=$(foreach dir, $(DIRS),$(BUILD_DIR)/$(dir)_merged.o)
++MERGED_OBJS:=$(foreach dir,$(DIRS),$($(dir)_OBJS))
+
+ $(FLINT_DIR)/$(FLINT_LIB_STATIC): $(MERGED_OBJS)
+ 	@echo "Building $(FLINT_LIB_STATIC)"