build: add evmone-build.sh for CI keeper builds

Add a build script that invokes CMake to build the evmone library.
The script handles native, arm64, and mipsle targets, gracefully
skipping cross-compilation targets when the cross-compiler is not
available.

Move the script reference in ci.go from ./evmone/build.sh (inside
the submodule, not tracked) to ./build/evmone-build.sh (tracked
in the main repo).

build/ci.go

@@ -334,7 +334,7 @@ func doInstallKeeper(cmdline []string) {
 			continue
 		}
 		log.Printf("Building evmone library for %s", evmoneTarget)
-		build.MustRun(exec.Command("./evmone/build.sh", evmoneTarget))
+		build.MustRun(exec.Command("./build/evmone-build.sh", evmoneTarget))
 		builtEvmone[evmoneTarget] = true
 	}
 

build/evmone-build.sh

@@ -0,0 +1,54 @@
+#!/bin/bash
+# Build evmone library for go-ethereum integration
+# Usage: evmone-build.sh [native|amd64|arm64|mipsle]
+set -e
+
+TARGET="${1:-native}"
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+EVMONE_DIR="$SCRIPT_DIR/../evmone"
+
+# Map Go arch names to build directories and CMake settings
+case "$TARGET" in
+    native|amd64)
+        BUILD_DIR="$EVMONE_DIR/build"
+        CMAKE_EXTRA=""
+        ;;
+    arm64)
+        if ! command -v aarch64-linux-gnu-gcc &>/dev/null; then
+            echo "Skipping arm64 build: cross-compiler not found"
+            exit 0
+        fi
+        BUILD_DIR="$EVMONE_DIR/build-arm64"
+        CMAKE_EXTRA="-DCMAKE_SYSTEM_PROCESSOR=aarch64 -DCMAKE_C_COMPILER=aarch64-linux-gnu-gcc -DCMAKE_CXX_COMPILER=aarch64-linux-gnu-g++"
+        ;;
+    mipsle)
+        if ! command -v mipsel-linux-gnu-gcc &>/dev/null; then
+            echo "Skipping mipsle build: cross-compiler not found"
+            exit 0
+        fi
+        BUILD_DIR="$EVMONE_DIR/build-mipsle"
+        CMAKE_EXTRA="-DCMAKE_SYSTEM_PROCESSOR=mipsel -DCMAKE_C_COMPILER=mipsel-linux-gnu-gcc -DCMAKE_CXX_COMPILER=mipsel-linux-gnu-g++ -DCMAKE_SYSTEM_NAME=Linux"
+        ;;
+    *)
+        echo "Unknown target: $TARGET" >&2
+        exit 1
+        ;;
+esac
+
+mkdir -p "$BUILD_DIR"
+cd "$BUILD_DIR"
+
+cmake "$EVMONE_DIR" \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DBUILD_SHARED_LIBS=ON \
+    -DEVMONE_TESTING=OFF \
+    -DEVMONE_FUZZING=OFF \
+    -DCMAKE_INSTALL_LIBDIR=lib \
+    $CMAKE_EXTRA
+
+cmake --build . --parallel
+
+# Ensure lib/ exists (some distros use lib64/)
+if [ -d "$BUILD_DIR/lib64" ] && [ ! -d "$BUILD_DIR/lib" ]; then
+    ln -sf lib64 "$BUILD_DIR/lib"
+fi