CMake version too old causing issues.

[chinlee1523]

报错：
CMake Error at CMakeLists.txt:61 (export):
export given OBJECT library "nebula_common_obj" which may not be exported.
Call Stack (most recent call first):
src/CMakeLists.txt:143 (nebula_add_library)

CMake Error at CMakeLists.txt:61 (export):
export given OBJECT library "nebula_graph_client_obj" which may not be
exported.
Call Stack (most recent call first):
src/CMakeLists.txt:148 (nebula_add_library)

CMake Error at CMakeLists.txt:61 (export):
export given OBJECT library "nebula_meta_client_obj" which may not be
exported.
Call Stack (most recent call first):
src/CMakeLists.txt:153 (nebula_add_library)

CMake Error at CMakeLists.txt:61 (export):
export given OBJECT library "nebula_storage_client_obj" which may not be
exported.
Call Stack (most recent call first):
src/CMakeLists.txt:158 (nebula_add_library)

[wey-gu]

@Shylock-Hg could you please take a look at this? thanks!

[Shylock-Hg]

What's the version?

[chinlee1523]

release-3.0

[Shylock-Hg]

release-3.0

I can't reproduce, what's the version of cmake?

[chinlee1523]

cmake version 3.6.0

[Shylock-Hg]

cmake version 3.6.0

I think you could try newer version.

[chinlee1523]

Please note the minimum requirements for CMAKE versions in the document.

[Shylock-Hg]

Please note the minimum requirements for CMAKE versions in the document.

Yes, we'll update it later.

[wey-gu]

@chinlee1523 also, PR on readme to update CMAKE versions or error handling in build scripts is more than welcome, too!

Thanks for the contribution :)