use arm64 runner to generate native builds

.github/resources/prover/Makefile

@@ -23,18 +23,15 @@ host_linux_x86_64_static:
 	    -DCMAKE_PREFIX_PATH=depends/gmp/package && \
 	make -j$(nproc) -vvv && make install
 
-host_linux_aarch64_static:
+host_linux_arm64_static:
 	rm -rf build_prover && mkdir build_prover && cd build_prover && \
 	cmake .. \
 	    -DTARGET_PLATFORM=aarch64 \
 	    -DCMAKE_BUILD_TYPE=Release \
 	    -DCMAKE_INSTALL_PREFIX=../package \
-	    -DCMAKE_SYSTEM_NAME=Linux \
-	    -DCMAKE_SYSTEM_PROCESSOR=aarch64 \
-	    -DCMAKE_C_COMPILER=aarch64-linux-gnu-gcc \
-	    -DCMAKE_CXX_COMPILER=aarch64-linux-gnu-g++ \
 	    -DCMAKE_EXE_LINKER_FLAGS="-static -static-libstdc++ -static-libgcc -no-pie" \
-	    -DUSE_ASM=OFF && \
+	    -DOpenMP_gomp_LIBRARY=$(LIBGOMP_A) \
+	    -DCMAKE_PREFIX_PATH=depends/gmp/package && \
 	make -j$(nproc) -vvv && make install
 
 host_windows_x86_64_static:

.github/resources/witness-generator/Makefile

@@ -13,21 +13,12 @@ OBJS            := $(SRCS:.cpp=.o)
 DEPS_HPP        := circom.hpp calcwit.hpp fr.hpp
 BIN             := $(PROJECT)
 
-# ---- Linux x86_64 ----
+# ---- Linux (x86_64 and aarch64) ----
 linux: CXXFLAGS=$(CXXFLAGS_COMMON)
 linux: LDFLAGS=-static
 linux: LDLIBS=-lgmp
 linux: $(BIN)
 
-# ---- Linux aarch64 (cross-compile) ----
-# Uses GMP built in rapidsnark/depends/gmp/package_aarch64
-# Path is relative from circuit_cpp directory (e.g., mantle/pol_cpp/)
-linux_aarch64: CXX=aarch64-linux-gnu-g++
-linux_aarch64: CXXFLAGS=$(CXXFLAGS_COMMON) -I../../rapidsnark/depends/gmp/package_aarch64/include
-linux_aarch64: LDFLAGS=-static -L../../rapidsnark/depends/gmp/package_aarch64/lib
-linux_aarch64: LDLIBS=-lgmp
-linux_aarch64: $(BIN)
-
 # ---- macOS ----
 macos: CXXFLAGS=$(CXXFLAGS_COMMON) -I/opt/homebrew/include -include gmp_patch.hpp
 macos: LDFLAGS=-Wl,-search_paths_first -Wl,-dead_strip

.github/workflows/build-circuits.yml

@@ -378,14 +378,14 @@ jobs:
           path: logos-blockchain-circuits-${{ env.VERSION }}-${{ env.OS }}-${{ env.ARCH }}.tar.gz
 
   build-linux-arm64:
-    name: Build Linux ARM64 Binaries (Cross-compile for RPI5)
-    runs-on: ubuntu-latest
+    name: Build Linux ARM64 Binaries (Native for RPI5)
+    runs-on: ubuntu-22.04-arm
     needs:
       - setup
       - generate-proving-keys
     env:
       VERSION: ${{ needs.setup.outputs.version }}
-      OS: linux_aarch64
+      OS: linux
       ARCH: aarch64
     steps:
       - name: Install Rust Toolchain
@@ -415,11 +415,8 @@ jobs:
       - name: Install Dependencies [Prover]
         run: sudo apt install -y build-essential cmake libgmp-dev libsodium-dev nasm curl m4
 
-      - name: Install Dependencies [Cross-compilation]
-        run: sudo apt install -y gcc-aarch64-linux-gnu g++-aarch64-linux-gnu
-
       - name: Install Dependencies [Witness Generator]
-        run: sudo apt install nlohmann-json3-dev
+        run: sudo apt install -y nlohmann-json3-dev
 
       - name: Replace Prover Makefile
         run: cp .github/resources/prover/Makefile rapidsnark/Makefile
@@ -442,8 +439,10 @@ jobs:
       - name: Compile Prover and Verifier
         working-directory: rapidsnark
         run: |
-          ./build_gmp.sh aarch64
-          make host_linux_aarch64_static
+          ./build_gmp.sh host
+          # Create symlink for TARGET_PLATFORM=aarch64 to find GMP
+          ln -s package depends/gmp/package_aarch64
+          make host_linux_arm64_static
 
       - name: Bundle Rapidsnark Prover
         env:
@@ -1179,7 +1178,7 @@ jobs:
         platform:
           - os: linux
             arch: x86_64
-          - os: linux_aarch64
+          - os: linux
             arch: aarch64
           - os: macos
             arch: aarch64