esp-idf/components/xtensa/project_include.cmake

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CMake
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# Check toolchain is configured properly in cmake
if(CMAKE_C_COMPILER_ID MATCHES "Clang")
# without '--target' option 'clang -dumpmachine' prints default target arch and it might be not Xtensa
# so use `-print-targets` option
execute_process(
COMMAND ${CMAKE_C_COMPILER} -print-targets
OUTPUT_VARIABLE dump_machine
)
else()
execute_process(
COMMAND ${CMAKE_C_COMPILER} -dumpmachine
OUTPUT_VARIABLE dump_machine
)
endif()
message(STATUS "Compiler supported targets: ${dump_machine}")
if(NOT (${CMAKE_SYSTEM_NAME} STREQUAL "Generic" AND ${dump_machine} MATCHES xtensa))
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message(FATAL_ERROR "Internal error, toolchain has not been set correctly by project "
"(or an invalid CMakeCache.txt file has been generated somehow)")
endif()