It compiles now

SLS_C/.gitignore

@@ -4,3 +4,4 @@ build_pico/
 *.o
 *.pdb
 CMakeLists.txt
+pico_arm_gcc_toolchain.cmake

SLS_C/build.py

@@ -20,6 +20,7 @@ TEST_TARGET = BIN_DIR / "sls_tests"
 # Platform-specific settings
 PICO_SDK_PATH = os.environ.get("PICO_SDK_PATH", Path.home() / "pico/pico-sdk")
 PICO_BUILD_DIR = Path("build_pico")
+PICO_TOOLCHAIN_PATH = Path("pico_arm_gcc_toolchain.cmake")
 
 # Unix gcc/clang flags
 COMMON_FLAGS = ["-std=c99", "-Wall", "-Wextra", "-Werror", "-Iinclude", "-g"]
@@ -34,6 +35,33 @@ MACOS_FLAGS = ["-std=c99", "-Wall", "-Wextra", "-Werror", "-Iinclude", "-g",
 MSVC_FLAGS = ["/std:c11", "/Zi", "/Iinclude"]
 MSVC_TEST_FLAGS = MSVC_FLAGS + []
 
+# RP2040 toolchain file template
+PICO_TOOLCHAIN_TEMPLATE = """set(CMAKE_SYSTEM_NAME Generic)
+set(CMAKE_SYSTEM_PROCESSOR cortex-m0plus)
+
+# Specify the cross compiler
+set(CMAKE_C_COMPILER arm-none-eabi-gcc)
+set(CMAKE_CXX_COMPILER arm-none-eabi-g++)
+set(CMAKE_ASM_COMPILER arm-none-eabi-gcc)
+
+# Compiler flags for Cortex-M0+
+set(CMAKE_C_FLAGS_INIT "-mcpu=cortex-m0plus -mthumb")
+set(CMAKE_CXX_FLAGS_INIT "-mcpu=cortex-m0plus -mthumb")
+set(CMAKE_ASM_FLAGS_INIT "-mcpu=cortex-m0plus -mthumb")
+
+# Don't run the linker on compiler check
+set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
+
+# Adjust the default behavior of the FIND_XXX() commands:
+# search programs in the host environment
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+
+# Search headers and libraries in the target environment
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+"""
+
 # RP2040 settings
 RP2040_CMAKE_TEMPLATE = """cmake_minimum_required(VERSION 3.13)
 
@@ -52,6 +80,12 @@ add_executable({project_name}
 {source_files}
 )
 
+# Set output name with .elf extension
+set_target_properties({project_name} PROPERTIES
+    OUTPUT_NAME "{project_name}.elf"
+    SUFFIX ""
+)
+
 # Add include directories
 target_include_directories({project_name} PRIVATE
     ${{CMAKE_CURRENT_LIST_DIR}}/include
@@ -247,9 +281,25 @@ def check_pico_sdk():
         print(f"ERROR: Pico SDK not found at {sdk_path}")
         print("Please set PICO_SDK_PATH environment variable or install SDK at ~/pico/pico-sdk")
         return False
+    
+    # Check for ARM toolchain
+    if not shutil.which("arm-none-eabi-gcc"):
+        print("ERROR: ARM toolchain not found!")
+        print("Please install arm-none-eabi-gcc:")
+        print("  Ubuntu/Debian: sudo apt install gcc-arm-none-eabi")
+        print("  macOS: brew install arm-none-eabi-gcc")
+        return False
+    
     return True
 
 
+def generate_pico_toolchain():
+    """Generate ARM GCC toolchain file for CMake"""
+    with open(PICO_TOOLCHAIN_PATH, "w") as f:
+        f.write(PICO_TOOLCHAIN_TEMPLATE)
+    print(f"Generated {PICO_TOOLCHAIN_PATH}")
+
+
 def generate_pico_cmake(project_name="sls"):
     """Generate CMakeLists.txt for RP2040 build"""
     sources = list(SRC_DIR.glob("*.c"))
@@ -279,17 +329,21 @@ def build_rp2040():
     
     print("\n=== Building for RP2040 ===\n")
     
+    # Generate toolchain file
+    generate_pico_toolchain()
+    
     # Generate CMakeLists.txt
     generate_pico_cmake()
     
     # Create build directory
     mkdir(PICO_BUILD_DIR)
     
-    # Run CMake (no need to pass PICO_SDK_PATH since it's in CMakeLists.txt)
+    # Run CMake with explicit toolchain
     cmake_cmd = [
         "cmake",
         "-B", str(PICO_BUILD_DIR),
-        "-S", "."
+        "-S", ".",
+        f"-DCMAKE_TOOLCHAIN_FILE={PICO_TOOLCHAIN_PATH}"
     ]
     run(cmake_cmd)
     
@@ -354,6 +408,9 @@ def clean():
     cmake_file = Path("CMakeLists.txt")
     if cmake_file.exists():
         cmake_file.unlink()
+    toolchain_file = PICO_TOOLCHAIN_PATH
+    if toolchain_file.exists():
+        toolchain_file.unlink()
     print("Cleaned.")