# rpi1-toolchain.cmake - Toolchain file for Raspberry Pi 1 (ARMv6)

# Additional settings for better compatibility
set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)

set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR arm)

# Detect if we're in a try_compile invocation
# During try_compile, BUILDROOT_PATH won't be available, but that's OK
# because we set CMAKE_TRY_COMPILE_TARGET_TYPE above
get_property(_IN_TRY_COMPILE GLOBAL PROPERTY IN_TRY_COMPILE)

if(NOT _IN_TRY_COMPILE)
    # Only validate during main configuration, not during try_compile
    if(NOT BUILDROOT_PATH)
        message(FATAL_ERROR 
            "BUILDROOT_PATH is not defined!\n"
            "Please pass -DBUILDROOT_PATH=/path/to/buildroot when configuring CMake.\n"
            "Example: cmake -DBUILDROOT_PATH=/home/user/rpi1/buildroot ..."
        )
    endif()

    # Verify BUILDROOT_PATH exists
    if(NOT EXISTS "${BUILDROOT_PATH}")
        message(FATAL_ERROR 
            "BUILDROOT_PATH does not exist: ${BUILDROOT_PATH}\n"
            "Please check your .env file or cmake configuration."
        )
    endif()
    
    # Cache it for use in this file during try_compile
    set(BUILDROOT_PATH "${BUILDROOT_PATH}" CACHE PATH "Path to buildroot directory" FORCE)
endif()

# If BUILDROOT_PATH is not set (during try_compile), try to get it from cache
if(NOT BUILDROOT_PATH)
    get_property(BUILDROOT_PATH CACHE BUILDROOT_PATH PROPERTY VALUE)
endif()

# Specify the cross compiler
set(TOOLCHAIN_PREFIX ${BUILDROOT_PATH}/output/host)
set(CMAKE_C_COMPILER ${TOOLCHAIN_PREFIX}/bin/arm-linux-gcc)
set(CMAKE_CXX_COMPILER ${TOOLCHAIN_PREFIX}/bin/arm-linux-g++)

# Specify the sysroot for finding libraries and headers
set(CMAKE_SYSROOT ${TOOLCHAIN_PREFIX}/arm-buildroot-linux-gnueabihf/sysroot)
set(CMAKE_FIND_ROOT_PATH ${CMAKE_SYSROOT})

# Only verify paths during main configuration
if(NOT _IN_TRY_COMPILE)
    # Verify sysroot exists
    if(NOT EXISTS "${CMAKE_SYSROOT}")
        message(FATAL_ERROR 
            "Sysroot not found: ${CMAKE_SYSROOT}\n"
            "Please check that buildroot is properly built."
        )
    endif()
endif()

# Search for programs in the build host directories
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)

# Search for libraries and headers in the target directories
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)

# Specify target architecture flags
set(CMAKE_C_FLAGS_INIT "-march=armv6 -mfpu=vfp -mfloat-abi=hard")
set(CMAKE_CXX_FLAGS_INIT "-march=armv6 -mfpu=vfp -mfloat-abi=hard")