如何通过cmake使用-fPIC编译jsoncpp
How to compile jsoncpp with -fPIC through cmake
我想用 -fPIC 编译 jsoncpp 到 cmake。
在jsoncpp的官网上，说明了正常编译的方式，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 makefile 中为 -fPIC 添加一些行。
所以我通过cmake添加了makefile的内容
我如何为 -fPIC 标志更改此 makefile？
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您必须更改 CMAKE_CXX_FLAGS 和 CMAKE_C_FLAGS 变量。您可以通过 ccmake 或 cmake-gui 执行此操作（您必须切换为高级），或者您可以按原样提供它：
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" ../..
不要费心去更改 Makefile，因为它会在您下次 运行 cmake.
时被覆盖
在CMake 2.8.9中你可以设置POSITION_INDEPENDENT_CODE属性
在目标上使所有后续目标位置独立。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 ..
我想用 -fPIC 编译 jsoncpp 到 cmake。
在jsoncpp的官网上，说明了正常编译的方式，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 makefile 中为 -fPIC 添加一些行。
所以我通过cmake添加了makefile的内容
我如何为 -fPIC 标志更改此 makefile？
# CMAKE generated file: DO NOT EDIT!
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.PHONY : default_target
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您必须更改 CMAKE_CXX_FLAGS 和 CMAKE_C_FLAGS 变量。您可以通过 ccmake 或 cmake-gui 执行此操作（您必须切换为高级），或者您可以按原样提供它：
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" ../..
不要费心去更改 Makefile，因为它会在您下次 运行 cmake.
在CMake 2.8.9中你可以设置POSITION_INDEPENDENT_CODE属性
在目标上使所有后续目标位置独立。或者您可以在 CMakeLists.txt
set(CMAKE_POSITION_INDEPENDENT_CODE ON)
或
cmake -DCMAKE_POSITION_INDEPENDENT_CODE=ON ..