fork from https://github.com/RainerKuemmerle/g2o

for ios build

my command list

1. vim CMakeLists.txt

modify from

OPTION (BUILD_SHARED_LIBS "Build Shared Libraries (preferred and required for the g2o plugin system)" ON)

to

OPTION (BUILD_SHARED_LIBS "Build Shared Libraries (preferred and required for the g2o plugin system)" OFF)

2. mkdir build-static
3. cd build-static
4. cmake -GXcode ..
5. open with xcode
6. some xcode modify config(IOS8.4, arm64/armv7/armv7s, and so on)

So, plesae use build-static dir.