如何通过cmake使用-fPIC编译jsoncpp

时间：2015-03-02 13:35:43

标签： c++ cmake makefile static-libraries

我希望使用jsoncpp到-fPIC汇总cmake。

在jsoncpp的网站上，它正在解释正常的编译方式，如下所示。

mkdir -p build/debug
cd build/debug
cmake -DCMAKE_BUILD_TYPE=debug -DJSONCPP_LIB_BUILD_STATIC=ON -DJSONCPP_LIB_BUILD_SHARED=OFF -G "Unix Makefiles" ../..
make

如何在此步骤中使用-fPIC标志进行编译？

-------------------------------------------- - - - - - - -编辑 - - - - - - - - - - - - - - - - - - -----------------------

我假设我必须在-fPIC的makefile中添加一些行。

所以我用cmake添加makefile的内容。

如何更改-fPIC标志的makefile？

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1 个答案:

答案 0 :(得分：1)

您必须更改CMAKE_CXX_FLAGS和CMAKE_CXX_FLAGS变量。您可以通过ccmake或cmake-gui执行此操作（您必须先切换），或者您可以按照以下方式提供：

cmake -DCMAKE_CXX_FLAGS=-fPIC -DCMAKE_C_FLAGS=-fPIC -DCMAKE_BUILD_TYPE=debug -DJSONCPP_LIB_BUILD_STATIC=ON -DJSONCPP_LIB_BUILD_SHARED=OFF -G "Unix Makefiles" ../..

不要费心更改Makefile，因为下次运行cmake时会覆盖它。

在CMake 2.8.9中，您可以设置POSITION_INDEPENDENT_CODE属性 在目标上使所有后续目标独立。或者您可以在CMakeLists.txt

中设置全局变量 
set(CMAKE_POSITION_INDEPENDENT_CODE ON)

或

cmake -DCMAKE_POSITION_INDEPENDENT_CODE=ON ..
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