如何修复 Unknown CMake command "check_symbol_exists"

如果你有使用 check_symbol_exists(...) 的 CMake 代码，如

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)

但你得到类似这样的错误消息

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!

你需要添加

CMakeLists_fixed.txt

include(CheckSymbolExists)

include(CheckSymbolExists)

在 CMakeLists.txt 的顶部附近（在第一次调用 check_symbol_exists() 之前）。

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