protobuf messages are not generated during build configuration about ns3-gym

[rukyr97]

I am having the same problem.

[a-andre]

Could you test if #74 fixes the issue?

[pgawlowicz]

Hi @a-andre and @rukyr97,

could I ask you to test a fresh installation of the app-ns-3.36+??

Thank you!

[a-andre]

Fresh installation builds without issues. (CMake 3.26, Protobuf 21.12)

[pgawlowicz]

nice, thank you @a-andre !

[Shadab442]

In my case fresh installation of ns-3.36.1/ns-3.37 does not work, I am using CMake 3.26 and Protobuf 3.20.3.

In ns-3.36.1 I get the following error when I configure the build:

CMake Error at /usr/share/cmake-3.26/Modules/FindProtobuf.cmake:493 (file):
file STRINGS file "/usr/include/google/protobuf/stubs/common.h" cannot be
read.
Call Stack (most recent call first):
contrib/ns3-gym/CMakeLists.txt:13 (find_package)

CMake Error at /usr/share/cmake-3.26/Modules/FindProtobuf.cmake:499 (math):
math cannot parse the expression: " / 1000000": syntax error, unexpected
exp_DIVIDE (2).
Call Stack (most recent call first):
contrib/ns3-gym/CMakeLists.txt:13 (find_package)

CMake Error at /usr/share/cmake-3.26/Modules/FindProtobuf.cmake:500 (math):
math cannot parse the expression: " / 1000 % 1000": syntax error,
unexpected exp_DIVIDE (2).
Call Stack (most recent call first):
contrib/ns3-gym/CMakeLists.txt:13 (find_package)

CMake Error at /usr/share/cmake-3.26/Modules/FindProtobuf.cmake:501 (math):
math cannot parse the expression: " % 1000": syntax error, unexpected
exp_MOD (2).
Call Stack (most recent call first):
contrib/ns3-gym/CMakeLists.txt:13 (find_package)

CMake Warning at build-support/3rd-party/colored-messages.cmake:81 (_message):
Protobuf compiler version 3.20.3; doesn't match library version
ERROR.ERROR.ERROR
Call Stack (most recent call first):
/usr/share/cmake-3.26/Modules/FindProtobuf.cmake:524 (message)
contrib/ns3-gym/CMakeLists.txt:13 (find_package)

CMake Error at build-support/custom-modules/ns3-module-macros.cmake:88 (add_library):
add_library ALIAS requires exactly one target argument.
Call Stack (most recent call first):
contrib/ns3-gym/CMakeLists.txt:40 (build_lib)

-- protobuf_generate command not found -> use a local copy from /home/blackjack/ns3-fresh/ns-3-allinone/ns-3.36.1/contrib/ns3-gym/protobuf-generate.cmake
CMake Error at build-support/3rd-party/colored-messages.cmake:78 (_message):
Error: protobuf_generate called without any targets or source
files
Call Stack (most recent call first):
contrib/ns3-gym/protobuf-generate.cmake:14 (message)
contrib/ns3-gym/CMakeLists.txt:62 (protobuf_generate)

CMake Error at build-support/3rd-party/colored-messages.cmake:78 (_message):
Error: protobuf_generate called without any targets or source
files
Call Stack (most recent call first):
contrib/ns3-gym/protobuf-generate.cmake:14 (message)
contrib/ns3-gym/CMakeLists.txt:69 (protobuf_generate)

In ns-3.37 I get this:

CMake Error at build-support/custom-modules/ns3-module-macros.cmake:76 (target_precompile_headers):
Cannot specify precompile headers for target "REUSE_FROM" which is not
built by this project.
Call Stack (most recent call first):
contrib/ns3-gym/CMakeLists.txt:40 (build_lib)

CMake Error at build-support/custom-modules/ns3-module-macros.cmake:94 (add_library):
add_library ALIAS requires exactly one target argument.
Call Stack (most recent call first):
contrib/ns3-gym/CMakeLists.txt:40 (build_lib)

-- Looking for protobuf_generate
-- Looking for protobuf_generate - not found
-- protobuf_generate command not found -> use a local copy from /home/blackjack/ns3-fresh/ns-3-allinone/ns-3.37/contrib/ns3-gym/protobuf-generate.cmake
CMake Error at build-support/3rd-party/colored-messages.cmake:78 (_message):
Error: protobuf_generate called without any targets or source
files
Call Stack (most recent call first):
contrib/ns3-gym/protobuf-generate.cmake:14 (message)
contrib/ns3-gym/CMakeLists.txt:62 (protobuf_generate)

CMake Error at build-support/3rd-party/colored-messages.cmake:78 (_message):
Error: protobuf_generate called without any targets or source
files
Call Stack (most recent call first):
contrib/ns3-gym/protobuf-generate.cmake:14 (message)
contrib/ns3-gym/CMakeLists.txt:69 (protobuf_generate)

Any suggestions?

[a-andre]

CMake Error at /usr/share/cmake-3.26/Modules/FindProtobuf.cmake:493 (file):
file STRINGS file "/usr/include/google/protobuf/stubs/common.h" cannot be read.

If you are on ubuntu, it seems you haven't installed libprotobuf-dev.

[Shadab442]

After installing libprotobuf-dev I get the following errors:

CMake Error at scratch/CMakeLists.txt:54 (target_link_libraries):
Target "scratch_scratch-simulator" links to:

protobuf::libprotobuf

but the target was not found. Possible reasons include:

* There is a typo in the target name.
* A find_package call is missing for an IMPORTED target.
* An ALIAS target is missing.

Call Stack (most recent call first):
scratch/CMakeLists.txt:67 (create_scratch)

CMake Error at scratch/CMakeLists.txt:54 (target_link_libraries):
Target "scratch_subdir_scratch-simulator-subdir" links to:

protobuf::libprotobuf

but the target was not found. Possible reasons include:

* There is a typo in the target name.
* A find_package call is missing for an IMPORTED target.
* An ALIAS target is missing.

Call Stack (most recent call first):
scratch/CMakeLists.txt:97 (create_scratch)

Any insights?

[a-andre]

At first, please use code blocks.

I looks like you changed something in the scratch directory. If so, please let us know what you have changed.

Does everything build without issues if you remove the opengym directory from contrib/?

You might want to try ns-3.38 (or 3.39, which should be released within the next days).

[Shadab442]

Sorry, next time I will use code blocks. Also, I have not changed anything in the Scratch directory. Also, everything builds without issues if I remove opengym. I will try with ns-3.38.

[Shadab442]

With ns-3.38, I did not get any configuration or build error. Thanks for the help.

[Shadab442]

After a fresh reinstallation, in ns-3.37, it is also working now. In ns-3.36.1, it gives the same error. Thank you for all your help.

[xxxxxy211]

same question on ns3 3.36.1 for me. my sys is ubuntu20.and i changed ns3 to3.38 its ok.