[FR] Compiling Firebase on Ubuntu 18.04 + Clang 6.0 compiler

[Jaisiero]

[REQUIRED] Please fill in the following fields:

• Pre-built SDK from the website or open-source from this repo: commit f0a9d5b
• Firebase C++ SDK version: v6.16.0
• Main Firebase Components in concern: All available
• Other Firebase Components in use: All available
• Platform you are using the C++ SDK on: Desktop Ubuntu 18.04
• Platform you are targeting: Desktop Linux

[REQUIRED] Please describe the question here:

Hi there,

I'm trying to compile Firebase for Desktop Linux target and I did it at first running this CMake configuration on my Ubuntu 18.04 distro like:

cmake ../../.. -DPROTOBUF_SRC_ROOT_FOLDER:PATH="/home/jaisiero/Documentos/Repos/FBLinux/protobuf-3.12.0" -DPROTOBUF_PROTOC_EXECUTABLE:FILEPATH="/home/jaisiero/Documentos/Repos/FBLinux/protoc-3.12.0-linux-x86_64/bin/protoc" -DNANOPB_SOURCE_DIR:PATH="/home/jaisiero/Documentos/Repos/FBLinux/nanopb-0.4.4-linux-x86" -DBUILD_TESTING=OFF -DCMAKE_POSITION_INDEPENDENT_CODE=ON -D_GLIBCXX_USE_CXX11_ABI=0 -DPYTHON_LIBRARY:PATH=/usr/lib/python3.6/config-3.6m-x86_64-linux-gnu/libpython3.6.so -DPYTHON_EXECUTABLE:FILEPATH=/usr/bin/python3.6 -DPYTHON_INCLUDE_DIR:PATH=/usr/include/python3.6

and it worked! I was able to compile Firebase libraries with my default GCC distro buuut I'm trying to link them with another libraries compiled with libc++ and as a result I'm having some link issues. Consequently, I try to compile with Clang running this CMake configuration getting this include error:

cmake ../../.. -DPROTOBUF_SRC_ROOT_FOLDER:PATH="/home/jaisiero/Documentos/Repos/FBLinux/protobuf-3.12.0" -DPROTOBUF_PROTOC_EXECUTABLE:FILEPATH="/home/jaisiero/Documentos/Repos/FBLinux/protoc-3.12.0-linux-x86_64/bin/protoc" -DBUILD_TESTING=OFF -DCMAKE_POSITION_INDEPENDENT_CODE=ON -DPYTHON_LIBRARY:PATH=/usr/lib/python3.6/config-3.6m-x86_64-linux-gnu/libpython3.6.so -DPYTHON_EXECUTABLE:FILEPATH=/usr/bin/python3.6 -DPYTHON_INCLUDE_DIR:PATH=/usr/include/python3.6 -DCMAKE_CXX_COMPILER="/usr/bin/clang++" -DCMAKE_C_COMPILER="/usr/bin/clang" -DCMAKE_EXE_LINKER_FLAGS="${CMAKE_EXE_LINKER_FLAGS} -stdlib=libc++ -lc++abi" -DCMAKE_THREAD_LIBS_INIT="-lpthread" -DCMAKE_HAVE_THREADS_LIBRARY=1 -DCMAKE_USE_WIN32_THREADS_INIT=0 -DCMAKE_USE_PTHREADS_INIT=1 -DTHREADS_PREFER_PTHREAD_FLAG=ON 
-- Downloading external project dependencies...
-- Download complete.
-- Configuring done
-- Generating done
-- Build files have been written to: /home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/external/src/firestore-build/external
[  1%] Creating directories for 'boringssl'
[  3%] Creating directories for 'protobuf'
[  4%] Creating directories for 'grpc'
[  7%] Creating directories for 'nanopb'
[  7%] Creating directories for 'abseil-cpp'
[ 11%] Creating directories for 'leveldb'
[ 11%] Creating directories for 'c-ares'
[ 12%] Performing download step (download, verify and extract) for 'boringssl'
[ 14%] Performing download step (download, verify and extract) for 'abseil-cpp'
[ 15%] Performing download step (download, verify and extract) for 'grpc'
[ 17%] Performing download step (download, verify and extract) for 'c-ares'
[ 19%] Performing download step (download, verify and extract) for 'protobuf'
[ 20%] Performing download step (download, verify and extract) for 'leveldb'
[ 22%] Performing download step (download, verify and extract) for 'nanopb'
-- Downloading...
   dst='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/downloads/boringssl-83da28a68f32023fd3b95a8ae94991a07b1f6c62.tar.gz'
   timeout='none'
-- Using src='https://github.com/google/boringssl/archive/83da28a68f32023fd3b95a8ae94991a07b1f6c62.tar.gz'
-- Downloading...
   dst='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/downloads/abseil-cpp-20200225.tar.gz'
   timeout='none'
-- Using src='https://github.com/abseil/abseil-cpp/archive/20200225.tar.gz'
-- Downloading...
   dst='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/downloads/grpc-1.28.0.tar.gz'
   timeout='none'
-- Using src='https://github.com/grpc/grpc/archive/v1.28.0.tar.gz'
-- Downloading...
   dst='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/downloads/c-ares-e982924acee7f7313b4baa4ee5ec000c5e373c30.tar.gz'
   timeout='none'
-- Using src='https://github.com/c-ares/c-ares/archive/e982924acee7f7313b4baa4ee5ec000c5e373c30.tar.gz'
-- verifying file...
       file='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/downloads/leveldb-1.22.tar.gz'
-- Downloading...
   dst='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/downloads/protobuf-29cd005ce1fe1a8fabf11e325cb13006a6646d59.tar.gz'
   timeout='none'
-- Using src='https://github.com/protocolbuffers/protobuf/archive/29cd005ce1fe1a8fabf11e325cb13006a6646d59.tar.gz'
-- File already exists and hash match (skip download):
  file='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/downloads/leveldb-1.22.tar.gz'
  SHA256='55423cac9e3306f4a9502c738a001e4a339d1a38ffbee7572d4a07d5d63949b2'
-- Downloading...
   dst='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/downloads/nanopb-0.3.9.5.tar.gz'
   timeout='none'
-- Using src='https://github.com/nanopb/nanopb/archive/nanopb-0.3.9.5.tar.gz'
-- extracting...
     src='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/downloads/leveldb-1.22.tar.gz'
     dst='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/external/src/firestore-build/external/src/leveldb'
-- extracting... [tar xfz]
-- extracting... [analysis]
-- extracting... [rename]
-- extracting... [clean up]
-- extracting... done
[ 23%] No patch step for 'leveldb'
[ 25%] No update step for 'leveldb'
[ 26%] No configure step for 'leveldb'
[ 28%] No build step for 'leveldb'
[ 30%] No install step for 'leveldb'
[ 31%] No test step for 'leveldb'
[ 33%] Completed 'leveldb'
[ 33%] Built target leveldb
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-- verifying file...
       file='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/downloads/c-ares-e982924acee7f7313b4baa4ee5ec000c5e373c30.tar.gz'
-- Downloading... done
-- extracting...
     src='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/downloads/c-ares-e982924acee7f7313b4baa4ee5ec000c5e373c30.tar.gz'
     dst='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/external/src/firestore-build/external/src/cares'
-- extracting... [tar xfz]
-- extracting... [analysis]
-- extracting... [rename]
-- extracting... [clean up]
-- extracting... done
[ 34%] No update step for 'c-ares'
[ 36%] No patch step for 'c-ares'
[ 38%] No configure step for 'c-ares'
[ 39%] No build step for 'c-ares'
[ 41%] No install step for 'c-ares'
[ 42%] No test step for 'c-ares'
[ 44%] Completed 'c-ares'
[ 44%] Built target c-ares
-- verifying file...
       file='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/downloads/nanopb-0.3.9.5.tar.gz'
-- Downloading... done
-- extracting...
     src='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/downloads/nanopb-0.3.9.5.tar.gz'
     dst='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/external/src/firestore-build/external/src/nanopb'
-- extracting... [tar xfz]
-- extracting... [analysis]
-- extracting... [rename]
-- extracting... [clean up]
-- extracting... done
[ 46%] No update step for 'nanopb'
[ 47%] No patch step for 'nanopb'
[ 49%] No configure step for 'nanopb'
[ 50%] No build step for 'nanopb'
[ 52%] No install step for 'nanopb'
[ 53%] No test step for 'nanopb'
[ 55%] Completed 'nanopb'
[ 55%] Built target nanopb
-- verifying file...
       file='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/downloads/abseil-cpp-20200225.tar.gz'
-- Downloading... done
-- extracting...
     src='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/downloads/abseil-cpp-20200225.tar.gz'
     dst='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/external/src/firestore-build/external/src/abseil-cpp'
-- extracting... [tar xfz]
-- extracting... [analysis]
-- extracting... [rename]
-- extracting... [clean up]
-- extracting... done
[ 57%] No update step for 'abseil-cpp'
[ 58%] No patch step for 'abseil-cpp'
[ 60%] No configure step for 'abseil-cpp'
[ 61%] No build step for 'abseil-cpp'
[ 63%] No install step for 'abseil-cpp'
[ 65%] No test step for 'abseil-cpp'
[ 66%] Completed 'abseil-cpp'
[ 66%] Built target abseil-cpp
-- verifying file...
       file='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/downloads/protobuf-29cd005ce1fe1a8fabf11e325cb13006a6646d59.tar.gz'
-- Downloading... done
-- extracting...
     src='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/downloads/protobuf-29cd005ce1fe1a8fabf11e325cb13006a6646d59.tar.gz'
     dst='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/external/src/firestore-build/external/src/protobuf'
-- extracting... [tar xfz]
-- extracting... [analysis]
-- extracting... [rename]
-- extracting... [clean up]
-- extracting... done
[ 68%] No update step for 'protobuf'
[ 69%] No patch step for 'protobuf'
[ 71%] No configure step for 'protobuf'
[ 73%] No build step for 'protobuf'
[ 74%] No install step for 'protobuf'
[ 76%] No test step for 'protobuf'
[ 77%] Completed 'protobuf'
[ 77%] Built target protobuf
-- verifying file...
       file='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/downloads/boringssl-83da28a68f32023fd3b95a8ae94991a07b1f6c62.tar.gz'
-- Downloading... done
-- extracting...
     src='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/downloads/boringssl-83da28a68f32023fd3b95a8ae94991a07b1f6c62.tar.gz'
     dst='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/external/src/firestore-build/external/src/boringssl'
-- extracting... [tar xfz]
-- verifying file...
       file='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/downloads/grpc-1.28.0.tar.gz'
-- Downloading... done
-- extracting...
     src='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/downloads/grpc-1.28.0.tar.gz'
     dst='/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/external/src/firestore-build/external/src/grpc'
-- extracting... [tar xfz]
-- extracting... [analysis]
-- extracting... [rename]
-- extracting... [clean up]
-- extracting... done
-- extracting... [analysis]
-- extracting... [rename]
[ 79%] No update step for 'grpc'
[ 80%] No patch step for 'grpc'
[ 82%] No configure step for 'grpc'
[ 84%] No build step for 'grpc'
[ 85%] No install step for 'grpc'
[ 87%] No test step for 'grpc'
-- extracting... [clean up]
-- extracting... done
[ 88%] No patch step for 'boringssl'
[ 90%] No update step for 'boringssl'
[ 92%] Completed 'grpc'
[ 93%] No configure step for 'boringssl'
[ 93%] Built target grpc
[ 95%] No build step for 'boringssl'
[ 96%] No install step for 'boringssl'
[ 98%] No test step for 'boringssl'
[100%] Completed 'boringssl'
[100%] Built target boringssl
-- 
-- 3.11.2.0
-- Check if the system is big endian
-- Searching 16 bit integer
CMake Error at /usr/share/cmake-3.10/Modules/TestBigEndian.cmake:49 (message):
  no suitable type found
Call Stack (most recent call first):
  out/build/destktop_linux64_build/external/src/firestore-build/external/src/leveldb/CMakeLists.txt:32 (test_big_endian)


-- Configuring incomplete, errors occurred!
See also "/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/CMakeFiles/CMakeOutput.log".
See also "/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/CMakeFiles/CMakeError.log".
[CMakeError.log](https://github.com/firebase/firebase-cpp-sdk/files/5754073/CMakeError.log)
[CMakeOutput.log](https://github.com/firebase/firebase-cpp-sdk/files/5754074/CMakeOutput.log)

I see in the official webpage that Firebase can be compile with Clang 5.0 on Ubuntu:

Firebase CPP SDK Setup

I'm currently using Clang 6.0.

I'm pretty sure it's a silly mistake and i hope someone could help me.

Cheers,
Jaime.

[google-oss-bot]

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• I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.
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[alexames]

Hi @Jaisiero,

I'm not sure off the top of my head what the issue would be based on the error I'm seeing. The error message gives you to other files to look into that have additional diagnostic information:

-- Configuring incomplete, errors occurred!
See also "/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/CMakeFiles/CMakeOutput.log".
See also "/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/CMakeFiles/CMakeError.log".

Take a look at those and see if they clarify what exactly is causing the failure.

[Jaisiero]

Hey @alexames ,

Sure! Here you are:

CMakeError.log
CMakeOutput.log

It's full of errors :S

It seems Cmake is not finding:

-lc++abi not found

but I installed clang in my distribution (Ubuntu 18.04) just like that:

sudo apt install clang

Thank you for helping,
Jaime.

[chkuang-g]

Taking a look at the log, it seems to have not only link error but also compiler error like

/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/CMakeFiles/CMakeTmp/CheckIncludeFiles.c:2:10: fatal error: 'winsock2.h' file not found
#include <winsock2.h>
         ^~~~~~~~~~~~
/home/jaisiero/Documentos/Repos/FBLinux/firebase-cpp-sdk/out/build/destktop_linux64_build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:27:19: error: use of undeclared identifier 'strnicmp'; did you mean 'strncmp'?
  return ((int*)(&strnicmp))[argc];
                  ^~~~~~~~
                  strncmp

I suspect that the source might not be compatible to Clang 6.0.

Let me ping the team and see if we have more insight about it.

[chkuang-g]

Does it work if you disable LevelDB build test using -DLEVELDB_BUILD_TESTS=OFF?

[Jaisiero]

Naaah, It doesn't work either.

CMakeError.log
CMakeOutput.log

Firebase c++ sdk says:

Firebase docs

Linux libraries
For Linux, library versions are provided for 32-bit (i386) and 64-bit (x86_64) platforms.

Note that the Linux libraries were tested using GCC 4.8.0, GCC 7.2.0, and Clang 5.0 on Ubuntu.

When building C++ desktop apps on Linux, link the pthread system library to your project. Consult your compiler documentation for more information. If you're building with GCC 5 or later, define -D_GLIBCXX_USE_CXX11_ABI=0.

However, you might be right and the source is not compatible with this compilator anymore or maybe I'm doing something wrong.

Thanks for your time,
Jaime.

[chkuang-g]

I'll put this as a feature request to support Clang 6.0+.