Cmake没有看到find_path中的变量

Question

我正在尝试使用cmke和gcc 5.4

使用activemq-cpp编译代码

find_path(ACTIVEMQCPP_DIR NAMES cms/Config.h HINTS $ENV{ACTIVEMQDIR})

此处ACTIVEMQDIR是一个设置为

的环境变量

  

/usr/local/include/activemq-cpp-3.10.0

message(STATUS ACTIVEMQCPP_DIR=${ACTIVEMQCPP_DIR})

include_directories(${ACTIVEMQCPP_DIR})

// include_directories（/usr/local/include/activemq-cpp-3.10.0） 如果我明确地硬编码路径，那就没问题......

cmake的输出：

-- The C compiler identification is GNU 5.4.0
-- The CXX compiler identification is GNU 5.4.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- 1=/usr/local/include/activemq-cpp-3.10.0
-- 2=/usr/local/lib
-- 3=/usr/local/include/activemq-cpp-3.10.0
-- 4=/usr/local/lib/libactivemq-cpp.so
-- Configuring done
-- Generating done
-- Build files have been written to
    -- The C compiler identification is GNU 5.4.0
    -- The CXX compiler identification is GNU 5.4.0
    -- Check for working C compiler: /usr/bin/cc
    -- Check for working C compiler: /usr/bin/cc -- works
    -- Detecting C compiler ABI info
    -- Detecting C compiler ABI info - done
    -- Detecting C compile features
    -- Detecting C compile features - done
    -- Check for working CXX compiler: /usr/bin/c++
    -- Check for working CXX compiler: /usr/bin/c++ -- works
    -- Detecting CXX compiler ABI info
    -- Detecting CXX compiler ABI info - done
    -- Detecting CXX compile features
    -- Detecting CXX compile features - done

ACTIVEMQCPP_DIR =的/ usr /本地/包括/ ActiveMQ的-CPP-3.10.0

    -- Configuring done
    -- Generating done
    -- Build files have been written to: /home/oem/ClionProjects/untitled/b2

问题是include_directories(${ACTIVEMQCPP_DIR})不起作用。变量ACTIVEMQCPP_DIR未设置

Answer 1

像这样写 include_directories($ENV{ACTIVEMQCPP_DIR}) 所以cmake knows it's an environemnt variable。