compiling fails on Ubuntu 18.04

[hokascha]

I am trying to get signal-cli running on Ubuntu 18.04.6 LTS which requires libsignal 0.20 but has no Glibc 2.28 - so compiling myself should be an option. While compiling, I get an error, looks like cmake is too old for the "parallel" parameter. Is there a way to circumvent the issue?

$ ./build_jni.sh desktop
cargo build -p libsignal-jni --release
   Compiling boring-sys v2.0.0 (https://github.com/signalapp/boring?branch=libsignal#b95cb545)
error: failed to run custom build command for `boring-sys v2.0.0 (https://github.com/signalapp/boring?branch=libsignal#b95cb545)`

Caused by:
  process didn't exit successfully: `/home/osboxes/signal/libsignal-0.20.0/target/release/build/boring-sys-32223fab38945807/build-script-build` (exit status: 101)
  --- stdout
  cargo:rerun-if-env-changed=BORING_BSSL_PATH
  CMAKE_TOOLCHAIN_FILE_x86_64-unknown-linux-gnu = None
  CMAKE_TOOLCHAIN_FILE_x86_64_unknown_linux_gnu = None
  HOST_CMAKE_TOOLCHAIN_FILE = None
  CMAKE_TOOLCHAIN_FILE = None
  CMAKE_GENERATOR_x86_64-unknown-linux-gnu = None
  CMAKE_GENERATOR_x86_64_unknown_linux_gnu = None
  HOST_CMAKE_GENERATOR = None
  CMAKE_GENERATOR = None
  CMAKE_PREFIX_PATH_x86_64-unknown-linux-gnu = None
  CMAKE_PREFIX_PATH_x86_64_unknown_linux_gnu = None
  HOST_CMAKE_PREFIX_PATH = None
  CMAKE_PREFIX_PATH = None
  CMAKE_x86_64-unknown-linux-gnu = None
  CMAKE_x86_64_unknown_linux_gnu = None
  HOST_CMAKE = None
  CMAKE = None
  running: "cmake" "/home/osboxes/.cargo/git/checkouts/boring-b37daebd62069023/b95cb54/boring-sys/deps/boringssl" "-DCMAKE_INSTALL_PREFIX=/home/osboxes/signal/libsignal-0.20.0/target/release/build/boring-sys-e25e21b28332e0f9/out" "-DCMAKE_C_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64" "-DCMAKE_C_COMPILER=/usr/bin/cc" "-DCMAKE_CXX_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64" "-DCMAKE_CXX_COMPILER=/usr/bin/c++" "-DCMAKE_ASM_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64" "-DCMAKE_ASM_COMPILER=/usr/bin/cc" "-DCMAKE_BUILD_TYPE=MinSizeRel"
  -- The C compiler identification is GNU 7.5.0
  -- The CXX compiler identification is GNU 7.5.0
  -- Check for working C compiler: /usr/bin/cc
  -- Check for working C compiler: /usr/bin/cc -- works
  -- Detecting C compiler ABI info
  -- Detecting C compiler ABI info - done
  -- Detecting C compile features
  -- Detecting C compile features - done
  -- Check for working CXX compiler: /usr/bin/c++
  -- Check for working CXX compiler: /usr/bin/c++ -- works
  -- Detecting CXX compiler ABI info
  -- Detecting CXX compiler ABI info - done
  -- Detecting CXX compile features
  -- Detecting CXX compile features - done
  -- The ASM compiler identification is GNU
  -- Found assembler: /usr/bin/cc
  -- Configuring done
  -- Generating done
  -- Build files have been written to: /home/osboxes/signal/libsignal-0.20.0/target/release/build/boring-sys-e25e21b28332e0f9/out/build
  running: "cmake" "--build" "." "--target" "crypto" "--config" "MinSizeRel" "--parallel" "1"

  --- stderr
  Unknown argument --parallel
  Unknown argument 1
  Usage: cmake --build <dir> [options] [-- [native-options]]
  Options:
    <dir>          = Project binary directory to be built.
    --target <tgt> = Build <tgt> instead of default targets.
                     May only be specified once.
    --config <cfg> = For multi-configuration tools, choose <cfg>.
    --clean-first  = Build target 'clean' first, then build.
                     (To clean only, use --target 'clean'.)
    --use-stderr   = Ignored.  Behavior is default in CMake >= 3.0.
    --             = Pass remaining options to the native tool.
  thread 'main' panicked at '
  command did not execute successfully, got: exit status: 1

  build script failed, must exit now', /home/osboxes/.cargo/registry/src/github.com-1ecc6299db9ec823/cmake-0.1.48/src/lib.rs:975:5
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

[jrose-signal]

And with --parallel 1 to boot! It looks like this is a bug in the cmake crate itself, fixed in the repo but not in any released versions. In the mean time, though, installing a newer version of CMake should work.

[hokascha]

correct, it works with the newer cmake version