如何使用 cmake 构建 eclipse paho

Question

我对 cmake 很陌生。我想将 eclipse paho 添加到我的项目中，因此我使用 "ExternalProject_add"。这是我的 CMakeLists.txt:

的摘录

ExternalProject_add( 
libressl
URL ${CMAKE_SOURCE_DIR}/externals/libressl-2.5.0.tar.gz
CONFIGURE_COMMAND ./configure --disable-hardening --prefix=${CMAKE_BINARY_DIR}
BUILD_IN_SOURCE 1)

ExternalProject_add( 
paho
DEPENDS libressl
URL ${CMAKE_SOURCE_DIR}/externals/eclipse-paho-mqtt-c-src-1.1.0.tar.gz
CMAKE_ARGS -DPAHO_WITH_SSL -DOPENSSL_INC_SEARCH_PATH=${CMAKE_SOURCE_DIR}/include -DOPENSSL_LIB_SEARCH_PATH=${CMAKE_SOURCE_DIR}/lib
BUILD_COMMAND make
BUILD_IN_SOURCE 1)

事实是 libressl 构建得很好。如您所见，它使用 autoconf-tools。

我的问题是 paho 在 "configure step" 处抛出错误。

 ~/projects/cmake_test/CL_Test/build$ cmake ..
 -- Configuring done
 -- Generating done
 -- Build files have been written to: /projects/cmake_test/CL_Test/build
 :~/projects/cmake_test/CL_Test/build$ make
 [ 50%] Built target libressl
 [ 56%] Performing configure step for 'paho'
 CMake Error at /projects/cmake_test/CL_Test/build/paho-prefix/src/paho-stamp/paho-configure-.cmake:16 (message):
 Command failed: 1

 '/usr/bin/cmake' '-DPAHO_WITH_SSL' '-DOPENSSL_INC_SEARCH_PATH=/home/hbaumann/projects/cmake_test/CL_Test/include' '-DOPENSSL_LIB_SEARCH_PATH=/home/hbaumann/projects/cmake_test/CL_Test/lib' '-GUnix Makefiles' '/projects/cmake_test/CL_Test/build/paho-prefix/src/paho'

 CMakeFiles/paho.dir/build.make:107: recipe for target 'paho-prefix/src/paho-stamp/paho-configure' failed
 make[2]: *** [paho-prefix/src/paho-stamp/paho-configure] Error 1
 CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/paho.dir/all' failed
 make[1]: *** [CMakeFiles/paho.dir/all] Error 2
 Makefile:83: recipe for target 'all' failed
 make: *** [all] Error 2

我想，因为 paho 是默认使用 CMake 构建的，所以我真的不需要添加任何内容。在这里你可以看到，我对CMake的了解真的很低。

让我奇怪的是，在 paho tar-ball 中，主文件夹中只有一个 Makefile 而不是 CMakeLists.txt。

我想念什么...是否需要设置特殊的配置命令？

提前谢谢

Answer 1

您可以使用 GIT 存储库，它有一个 CMakeList.txt。

ExternalProject_add(
paho
DEPENDS libressl
GIT_REPOSITORY "https://github.com/eclipse/paho.mqtt.c.git"
GIT_TAG "master"
UPDATE_COMMAND ""
PATCH_COMMAND ""
SOURCE_DIR "${CMAKE_BINARY_DIR}/paho_sourcedir"
CMAKE_ARGS -DPAHO_WITH_SSL=TRUE -DOPENSSL_INC_SEARCH_PATH=${CMAKE_BINARY_DIR}/include -DOPENSSL_LIB_SEARCH_PATH=${CMAKE_BINARY_DIR}/lib -DCMAKE_INSTALL_PREFIX=${CMAKE_BINARY_DIR}/paho_prefix
)

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