diff --git a/tools/build.bat b/tools/build.bat
index b98b23e..80a529f 100644
--- a/tools/build.bat
+++ b/tools/build.bat
@@ -1,68 +1,156 @@
+@echo off
+setlocal ENABLEDELAYEDEXPANSION
+
+set ARCH=%1
+if "%ARCH%"=="" set ARCH=x86_64
+
+if not "%ARCH%"=="x86_64" ^
+if not "%ARCH%"=="x86" ^
+if not "%ARCH%"=="arm64" ^
+if not "%ARCH%"=="arm-v6" ^
+if not "%ARCH%"=="arm-v7" ^
+if not "%ARCH%"=="all" (
+    echo Usage: %0 [x86_64^|x86^|arm64^|arm-v6^|arm-v7^|all]
+    exit /b 1
+)
+
 mkdir build\stencils
 mkdir build\runner
-python stencils/generate_stencils.py build/stencils/stencils.c
 
+python stencils/generate_stencils.py build\stencils\stencils.c
+
+REM ============================================================
+REM x86_64
+REM ============================================================
+if "%ARCH%"=="x86_64" goto BUILD_X86_64
+if "%ARCH%"=="all"    goto BUILD_X86_64
+goto SKIP_X86_64
+
+:BUILD_X86_64
 echo -------------x86_64 - 64 bit-----------------
+
 call "C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\VC\Auxiliary\Build\vcvarsall.bat" x64
+
 echo - Compile stencil test...
 cl /Zi /Od stencils\test.c /Fe:build\stencils\test.exe
 
 echo - Build runner for Windows 64 bit...
-cl /Zi /Od /DENABLE_BASIC_LOGGING src\coparun\runmem.c src\coparun\coparun.c src\coparun\mem_man.c /Fe:build\runner\coparun.exe
+cl /Zi /Od /DENABLE_BASIC_LOGGING ^
+    src\coparun\runmem.c ^
+    src\coparun\coparun.c ^
+    src\coparun\mem_man.c ^
+    /Fe:build\runner\coparun.exe
 
-REM Optimized:
-REM cl /O2 src\coparun\runmem.c src\coparun\coparun.c src\coparun\mem_man.c /Fe:build\runner\coparun.exe
-
-echo - Build stencils for 64 bit...
-REM ../copapy/tools/cross_compiler_unix/packobjs.sh gcc ld ../copapy/build/musl/musl_objects_x86_64.o
+echo - Build stencils for x86_64...
 wsl gcc -fno-pic -ffunction-sections -c build/stencils/stencils.c -O3 -o build/stencils/stencils.o
 wsl ld -r build/stencils/stencils.o build/musl/musl_objects_x86_64.o -o src/copapy/obj/stencils_x86_64_O3.o
 wsl objdump -d -x src/copapy/obj/stencils_x86_64_O3.o > build/stencils/stencils_x86_64_O3.asm
 
-echo ---------------x86 - 32 bit---------------
+:SKIP_X86_64
+
+REM ============================================================
+REM x86 32-bit
+REM ============================================================
+if "%ARCH%"=="x86" goto BUILD_X86
+if "%ARCH%"=="all" goto BUILD_X86
+goto SKIP_X86
+
+:BUILD_X86
+echo ---------------x86 - 32 bit----------------
+
 call "C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\VC\Auxiliary\Build\vcvarsall.bat" x86
 
 echo - Build runner for Windows 32 bit...
-cl /Zi /Od /DENABLE_LOGGING src\coparun\runmem.c src\coparun\coparun.c src\coparun\mem_man.c /Fe:build\runner\coparun-x86.exe
+cl /Zi /Od /DENABLE_LOGGING ^
+    src\coparun\runmem.c ^
+    src\coparun\coparun.c ^
+    src\coparun\mem_man.c ^
+    /Fe:build\runner\coparun-x86.exe
 
-echo - Build runner for linux x86 32 bit...
-wsl i686-linux-gnu-gcc-12 -static -Wall -Wextra -Wconversion -Wsign-conversion -Wshadow -Wstrict-overflow -O3 -DENABLE_LOGGING src/coparun/runmem.c src/coparun/coparun.c src/coparun/mem_man.c -o build/runner/coparun-x86
+echo - Build runner for Linux x86 32 bit...
+wsl i686-linux-gnu-gcc-12 -static -O3 -DENABLE_LOGGING ^
+    src/coparun/runmem.c ^
+    src/coparun/coparun.c ^
+    src/coparun/mem_man.c ^
+    -o build/runner/coparun-x86
 
 echo - Build stencils x86 32 bit...
-REM  sh ../copapy/tools/cross_compiler_unix/packobjs.sh i686-linux-gnu-gcc-12 i686-linux-gnu-ld ../copapy/build/musl/musl_objects_x86.o  -fno-pic
 wsl i686-linux-gnu-gcc-12 -fno-pic -ffunction-sections -c build/stencils/stencils.c -O3 -o build/stencils/stencils.o
 wsl i686-linux-gnu-ld -r build/stencils/stencils.o build/musl/musl_objects_x86.o -o src/copapy/obj/stencils_x86_O3.o
 wsl i686-linux-gnu-objdump -d -x src/copapy/obj/stencils_x86_O3.o > build/stencils/stencils_x86_O3.asm
 
+:SKIP_X86
+
+REM ============================================================
+REM ARM64
+REM ============================================================
+if "%ARCH%"=="arm64" goto BUILD_ARM64
+if "%ARCH%"=="all"   goto BUILD_ARM64
+goto SKIP_ARM64
+
+:BUILD_ARM64
+echo --------------arm64 64 bit----------------
 
-echo --------------arm64  64 bit----------------
 wsl aarch64-linux-gnu-gcc-12 -fno-pic -ffunction-sections -c build/stencils/stencils.c -O3 -o build/stencils/stencils.o
 wsl aarch64-linux-gnu-ld -r build/stencils/stencils.o build/musl/musl_objects_arm64.o -o src/copapy/obj/stencils_arm64_O3.o
 wsl aarch64-linux-gnu-objdump -d -x src/copapy/obj/stencils_arm64_O3.o > build/stencils/stencils_arm64_O3.asm
-echo ------------------------------
-echo - Build runner for Aarch64...
-wsl aarch64-linux-gnu-gcc-12 -static -Wall -Wextra -Wconversion -Wsign-conversion -Wshadow -Wstrict-overflow -O3 -DENABLE_LOGGING src/coparun/runmem.c src/coparun/coparun.c src/coparun/mem_man.c -o build/runner/coparun-aarch64
 
+echo - Build runner for AArch64...
+wsl aarch64-linux-gnu-gcc-12 -static -O3 -DENABLE_LOGGING ^
+    src/coparun/runmem.c ^
+    src/coparun/coparun.c ^
+    src/coparun/mem_man.c ^
+    -o build/runner/coparun-aarch64
+
+:SKIP_ARM64
+
+REM ============================================================
+REM ARM v6
+REM ============================================================
+if "%ARCH%"=="arm-v6" goto BUILD_ARMV6
+if "%ARCH%"=="all"    goto BUILD_ARMV6
+goto SKIP_ARMV6
+
+:BUILD_ARMV6
+echo --------------arm-v6 32 bit----------------
+
+wsl arm-none-eabi-gcc -fno-pic -ffunction-sections -march=armv6 -mfpu=vfp -mfloat-abi=hard -marm ^
+    -c build/stencils/stencils.c -O3 -o build/stencils/stencils.o
+
+wsl arm-none-eabi-ld -r build/stencils/stencils.o build/musl/musl_objects_armv6.o ^
+    $(arm-none-eabi-gcc -print-libgcc-file-name) ^
+    -o src/copapy/obj/stencils_armv6_O3.o
 
-echo --------------arm-v6  32 bit----------------
-REM  sh ../copapy/tools/cross_compiler_unix/packobjs.sh arm-none-eabi-gcc arm-none-eabi-ld ../copapy/build/musl/musl_objects_armv6.o "-march=armv6 -mfpu=vfp -marm"
-wsl arm-none-eabi-gcc -fno-pic -ffunction-sections -march=armv6 -mfpu=vfp -mfloat-abi=hard -marm -c build/stencils/stencils.c -O3 -o build/stencils/stencils.o
-wsl arm-none-eabi-ld -r build/stencils/stencils.o build/musl/musl_objects_armv6.o $(arm-none-eabi-gcc -print-libgcc-file-name) -o src/copapy/obj/stencils_armv6_O3.o
 wsl arm-none-eabi-objdump -d -x src/copapy/obj/stencils_armv6_O3.o > build/stencils/stencils_armv6_O3.asm
-echo ------------------------------
-REM echo - Build runner
-REM wsl arm-linux-gnueabihf-gcc -march=armv6 -mfpu=vfp -marm -static -Wall -Wextra -Wconversion -Wsign-conversion -Wshadow -Wstrict-overflow -O3 -DENABLE_LOGGING src/coparun/runmem.c src/coparun/coparun.c src/coparun/mem_man.c -o build/runner/coparun-armv6
 
+:SKIP_ARMV6
 
+REM ============================================================
+REM ARM v7
+REM ============================================================
+if "%ARCH%"=="arm-v7" goto BUILD_ARMV7
+if "%ARCH%"=="all"    goto BUILD_ARMV7
+goto END
+
+:BUILD_ARMV7
+echo --------------arm-v7 32 bit----------------
+
+wsl arm-none-eabi-gcc -fno-pic -ffunction-sections -march=armv7-a -mfpu=neon-vfpv3 -mfloat-abi=hard -marm ^
+    -c build/stencils/stencils.c -O3 -o build/stencils/stencils.o
+
+wsl arm-none-eabi-ld -r build/stencils/stencils.o build/musl/musl_objects_armv7.o ^
+    $(arm-none-eabi-gcc -print-libgcc-file-name) ^
+    -o src/copapy/obj/stencils_armv7_O3.o
 
-echo --------------arm-v7  32 bit----------------
-REM  sh ../copapy/tools/cross_compiler_unix/packobjs.sh arm-none-eabi-gcc arm-none-eabi-ld ../copapy/build/musl/musl_objects_armv7.o "-march=armv7-a -mfpu=neon-vfpv3 -marm"
-wsl arm-none-eabi-gcc -fno-pic -ffunction-sections -march=armv7-a -mfpu=neon-vfpv3 -mfloat-abi=hard -marm -c build/stencils/stencils.c -O3 -o build/stencils/stencils.o
-wsl arm-none-eabi-ld -r build/stencils/stencils.o build/musl/musl_objects_armv7.o $(arm-none-eabi-gcc -print-libgcc-file-name) -o src/copapy/obj/stencils_armv7_O3.o
 wsl arm-none-eabi-objdump -d -x src/copapy/obj/stencils_armv7_O3.o > build/stencils/stencils_armv7_O3.asm
 
+echo - Build runner for ARM v7...
+wsl arm-linux-gnueabihf-gcc -static -O3 -DENABLE_LOGGING ^
+    src/coparun/runmem.c ^
+    src/coparun/coparun.c ^
+    src/coparun/mem_man.c ^
+    -o build/runner/coparun-armv7
 
-echo ------------------------------
-echo - Build runner
-wsl arm-linux-gnueabihf-gcc -march=armv7-a -mfpu=neon-vfpv3 -marm -static -Wall -Wextra -Wconversion -Wsign-conversion -Wshadow -Wstrict-overflow -O3 -DENABLE_LOGGING src/coparun/runmem.c src/coparun/coparun.c src/coparun/mem_man.c -o build/runner/coparun-armv7
-
+:END
+echo Build completed for %ARCH%
+endlocal
diff --git a/tools/build.sh b/tools/build.sh
index 2ece1e8..b7e3cd6 100644
--- a/tools/build.sh
+++ b/tools/build.sh
@@ -1,6 +1,16 @@
 #!/bin/bash
-set -e
-set -v
+set -eux
+
+ARCH=${1:-x86_64}
+
+case "$ARCH" in
+    (x86_64|arm-v6|arm-v7|all)
+        ;;
+    (*)
+        echo "Usage: $0 [x86_64|arm-v6|arm-v7|all]"
+        exit 1
+        ;;
+esac
 
 mkdir -p build/stencils
 mkdir -p build/runner
@@ -10,34 +20,90 @@ DEST=src/copapy/obj
 python3 stencils/generate_stencils.py $SRC
 mkdir -p $DEST
 
-gcc -fno-pic -ffunction-sections -c $SRC -O3 -o build/stencils/stencils.o
-ld -r build/stencils/stencils.o build/musl/musl_objects_x86_64.o -o $DEST/stencils_x86_64_O3.o
-objdump -d -x $DEST/stencils_x86_64_O3.o > build/stencils/stencils_x86_64_O3.asm
+#######################################
+# x86_64
+#######################################
+if [[ "$ARCH" == "x86_64" || "$ARCH" == "all" ]]; then
+    echo "--------------x86_64----------------"
 
-mkdir bin -p
-gcc -Wall -Wextra -Wconversion -Wsign-conversion \
-    -Wshadow -Wstrict-overflow -Werror -g -O3 \
-    -DENABLE_LOGGING \
-    src/coparun/runmem.c src/coparun/coparun.c src/coparun/mem_man.c -o build/runner/coparun
+    gcc -fno-pic -ffunction-sections -c $SRC -O3 -o build/stencils/stencils.o
+    ld -r build/stencils/stencils.o build/musl/musl_objects_x86_64.o \
+        -o $DEST/stencils_x86_64_O3.o
+    objdump -d -x $DEST/stencils_x86_64_O3.o \
+        > build/stencils/stencils_x86_64_O3.asm
 
+    mkdir -p bin
+    gcc -Wall -Wextra -Wconversion -Wsign-conversion \
+        -Wshadow -Wstrict-overflow -Werror -g -O3 \
+        -DENABLE_LOGGING \
+        src/coparun/runmem.c \
+        src/coparun/coparun.c \
+        src/coparun/mem_man.c \
+        -o build/runner/coparun
+fi
 
-echo "--------------arm-v6  32 bit----------------"
-LIBGCC=$(arm-none-eabi-gcc -print-libgcc-file-name)
-#LIBM=$(arm-none-eabi-gcc -print-file-name=libm.a)
-#LIBC=$(arm-none-eabi-gcc -print-file-name=libc.a)
+#######################################
+# ARM v6
+#######################################
+if [[ "$ARCH" == "arm-v6" || "$ARCH" == "all" ]]; then
+    echo "--------------arm-v6 32 bit----------------"
 
-arm-none-eabi-gcc -fno-pic -ffunction-sections -march=armv6 -mfpu=vfp -mfloat-abi=hard -marm -c $SRC -O3 -o build/stencils/stencils.o
-arm-none-eabi-ld -r build/stencils/stencils.o build/musl/musl_objects_armv6.o $LIBGCC -o $DEST/stencils_armv6_O3.o
-arm-none-eabi-objdump -d -x $DEST/stencils_armv6_O3.o > build/stencils/stencils_armv6_O3.asm
-arm-linux-gnueabihf-gcc -march=armv6 -mfpu=vfp -mfloat-abi=hard -marm -static -Wall -Wextra -Wconversion -Wsign-conversion -Wshadow -Wstrict-overflow -O3 -DENABLE_LOGGING src/coparun/runmem.c src/coparun/coparun.c src/coparun/mem_man.c -o build/runner/coparun-armv6
+    LIBGCC=$(arm-none-eabi-gcc -print-libgcc-file-name)
 
+    arm-none-eabi-gcc -fno-pic -ffunction-sections \
+        -march=armv6 -mfpu=vfp -mfloat-abi=hard -marm \
+        -c $SRC -O3 -o build/stencils/stencils.o
 
-echo "--------------arm-v7  32 bit----------------"
-LIBGCC=$(arm-none-eabi-gcc -print-libgcc-file-name)
-#LIBM=$(arm-none-eabi-gcc -print-file-name=libm.a)
-#LIBC=$(arm-none-eabi-gcc -print-file-name=libc.a)
+    arm-none-eabi-ld -r \
+        build/stencils/stencils.o \
+        build/musl/musl_objects_armv6.o \
+        $LIBGCC \
+        -o $DEST/stencils_armv6_O3.o
 
-arm-none-eabi-gcc -fno-pic -ffunction-sections -march=armv7-a -mfpu=neon-vfpv3 -mfloat-abi=hard -marm -c $SRC -O3 -o build/stencils/stencils.o
-arm-none-eabi-ld -r build/stencils/stencils.o build/musl/musl_objects_armv7.o $LIBGCC -o $DEST/stencils_armv7_O3.o
-arm-none-eabi-objdump -d -x $DEST/stencils_armv7_O3.o > build/stencils/stencils_armv7_O3.asm
-arm-linux-gnueabihf-gcc -march=armv7-a -mfpu=neon-vfpv3 -mfloat-abi=hard -marm -static -Wall -Wextra -Wconversion -Wsign-conversion -Wshadow -Wstrict-overflow -O3 -DENABLE_LOGGING src/coparun/runmem.c src/coparun/coparun.c src/coparun/mem_man.c -o build/runner/coparun-armv7
+    arm-none-eabi-objdump -d -x \
+        $DEST/stencils_armv6_O3.o \
+        > build/stencils/stencils_armv6_O3.asm
+
+    arm-linux-gnueabihf-gcc \
+        -march=armv6 -mfpu=vfp -mfloat-abi=hard -marm -static \
+        -Wall -Wextra -Wconversion -Wsign-conversion \
+        -Wshadow -Wstrict-overflow -O3 \
+        -DENABLE_LOGGING \
+        src/coparun/runmem.c \
+        src/coparun/coparun.c \
+        src/coparun/mem_man.c \
+        -o build/runner/coparun-armv6
+fi
+
+#######################################
+# ARM v7
+#######################################
+if [[ "$ARCH" == "arm-v7" || "$ARCH" == "all" ]]; then
+    echo "--------------arm-v7 32 bit----------------"
+
+    LIBGCC=$(arm-none-eabi-gcc -print-libgcc-file-name)
+
+    arm-none-eabi-gcc -fno-pic -ffunction-sections \
+        -march=armv7-a -mfpu=neon-vfpv3 -mfloat-abi=hard -marm \
+        -c $SRC -O3 -o build/stencils/stencils.o
+
+    arm-none-eabi-ld -r \
+        build/stencils/stencils.o \
+        build/musl/musl_objects_armv7.o \
+        $LIBGCC \
+        -o $DEST/stencils_armv7_O3.o
+
+    arm-none-eabi-objdump -d -x \
+        $DEST/stencils_armv7_O3.o \
+        > build/stencils/stencils_armv7_O3.asm
+
+    arm-linux-gnueabihf-gcc \
+        -march=armv7-a -mfpu=neon-vfpv3 -mfloat-abi=hard -marm -static \
+        -Wall -Wextra -Wconversion -Wsign-conversion \
+        -Wshadow -Wstrict-overflow -O3 \
+        -DENABLE_LOGGING \
+        src/coparun/runmem.c \
+        src/coparun/coparun.c \
+        src/coparun/mem_man.c \
+        -o build/runner/coparun-armv7
+fi