Add ability to build with system installed jsoncpp#1716
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ArchangeGabriel wants to merge 2 commits intoValveSoftware:masterfrom
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Add ability to build with system installed jsoncpp#1716ArchangeGabriel wants to merge 2 commits intoValveSoftware:masterfrom
ArchangeGabriel wants to merge 2 commits intoValveSoftware:masterfrom
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This patch adds the CMake build option `USE_SYSTEM_JSONCPP`, which instead of using the internal `jsoncpp.cpp` links against the system installed jsoncpp library. This results in a `libopenvr_api.so` that is only 115K instead of 301K on my system. Distributions like Debian will prefer this behaviour, since it will give them the possibility to maintain version and security issues for jsoncpp in one place. This behaviour can be enabled by ``` cmake -DUSE_SYSTEM_JSONCPP=True . ``` When the flag is not set, the build will behave like it did before. I tested this patch using the system wide jsoncpp successfully with xrdesktop.
Even though the previous patch in this patch set enabled the build with a system wide jsoncpp and worked for me, it still left the internal jsoncpp includes in the include path, since the includes were placed in `CMAKE_CURRENT_SOURCE_DIR`. This could cause problems on other systems when trying to build with a system wide jsoncpp. In order to remove the internal json.h from the include path, I moved all jsoncpp files into a thridparty directory amd include it in the case of `USE_SYSTEM_JSONCPP` not being set.
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This is just #1178 but rebased on top of current release.