Behebung von 'Unknown CMake command "check_symbol_exists"'

Wenn du CMake-Code hast, der check_symbol_exists(...) verwendet, wie

CMakeLists.txt

list(APPEND CMAKE_REQUIRED_LIBRARIES m)
check_symbol_exists(atan2 math.h HAVE_ATAN2)

list(APPEND CMAKE_REQUIRED_LIBRARIES m)
check_symbol_exists(atan2 math.h HAVE_ATAN2)

aber du eine Fehlermeldung wie diese erhältst

error_message.txt

CMake Error at CMakeLists.txt:8 (check_symbol_exists):
  Unknown CMake command "check_symbol_exists".

-- Configuring incomplete, errors occurred!

CMake Error at CMakeLists.txt:8 (check_symbol_exists):
  Unknown CMake command "check_symbol_exists".

-- Configuring incomplete, errors occurred!

musst du hinzufügen

CMakeLists_fixed.txt

include(CheckSymbolExists)

include(CheckSymbolExists)

in der Nähe des Anfangs deiner CMakeLists.txt (vor deinem ersten Aufruf von check_symbol_exists()).

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