Better cross compile

.github/workflows/ci.yml

@@ -16,15 +16,15 @@ jobs:
     strategy:
       matrix:
         include:
-          - os: windows-2019
-            name: win-x86
-            param: -x86
-          - os: windows-2019
-            name: win-x64
-            param: -x64
-          - os: windows-2019
-            name: win-arm64
-            param: -arm64
+        #   - os: windows-2019
+        #     name: win-x86
+        #     param: -x86
+        #   - os: windows-2019
+        #     name: win-x64
+        #     param: -x64
+        #   - os: windows-2019
+        #     name: win-arm64
+        #     param: -arm64
           - os: ubuntu-24.04
             name: linux-x64
           - os: ubuntu-24.04
@@ -39,10 +39,10 @@ jobs:
             name: linux-musl-arm
           - os: ubuntu-24.04
             name: linux-musl-arm64
-          - os: macos-13
-            name: osx-x64
-          - os: macos-13
-            name: osx-arm64
+        #   - os: macos-13
+        #     name: osx-x64
+        #   - os: macos-13
+        #     name: osx-arm64
       fail-fast: false
     steps:
       - name: Checkout
@@ -55,9 +55,6 @@ jobs:
       - name: Build macOS
         if: runner.os == 'macOS'
         run: ./build.libgit2.sh
-      - name: Setup QEMU
-        if: matrix.name == 'linux-musl-arm' || matrix.name == 'linux-musl-arm64'
-        run: docker run --rm --privileged multiarch/qemu-user-static:register --reset
       - name: Build Linux
         if: runner.os == 'Linux'
         run: ./dockerbuild.sh

Dockerfile.linux-musl

@@ -1,8 +1,18 @@
-ARG ARCH='amd64'
-FROM multiarch/alpine:${ARCH}-v3.13
-RUN apk add --no-cache bash build-base cmake
+FROM --platform=$BUILDPLATFORM tonistiigi/xx AS xx
+
+FROM --platform=$BUILDPLATFORM alpine
+
+COPY --from=xx / /
+
+RUN apk add cmake clang lld bash build-base
 
 WORKDIR /nativebinaries
 COPY . /nativebinaries/
 
+ARG TARGETPLATFORM
+RUN xx-apk add musl-dev gcc pkgconf
+
+RUN xx-info env
+RUN xx-clang --setup-target-triple
+
 CMD ["/bin/bash", "-c", "./build.libgit2.sh"]

build.libgit2.sh

@@ -33,6 +33,7 @@ cmake -DCMAKE_BUILD_TYPE:STRING=Release \
       -DCMAKE_OSX_ARCHITECTURES=$OSXARCHITECTURE \
       -DUSE_HTTPS=$USEHTTPS \
       -DUSE_BUNDLED_ZLIB=ON \
+      $(xx-clang --print-cmake-defines) \
       ..
 cmake --build .
 

dockerbuild.sh

@@ -19,9 +19,9 @@ else
     dockerfile="Dockerfile.linux"
 fi
 
-docker buildx build -t $RID -f $dockerfile --build-arg ARCH=$arch .
+docker buildx build -t $RID -f $dockerfile --platform=linux/$arch --build-arg ARCH=$arch .
 
-docker run -t -e RID=$RID --name=$RID $RID
+docker run -t -e RID=$RID --name=$RID --platform=linux/$arch $RID
 
 docker cp $RID:/nativebinaries/nuget.package/runtimes nuget.package