How can I use gcc7 / llvm7 on my project

slee047 · August 8, 2019, 1:10pm

As per topic, I have the following YAML file

language: node_js
env:
global:
- NODEVER=10.16.2
- GCCMAINVER=7
- RUBY_VER=2.6.3
- arch=x64
- mode=release
- NODEC_TESTS_TMPDIR=/tmp/nodec_tests_tmpdir
- LINPRJDIR=/home/travis/build/slee047/node-packer
- OSXPRJDIR=/Users/travis/build/slee047/node-packer

matrix:
include:

os: osx
osx_image: xcode11
node_js: $NODEVER
env: TEST_SCRIPT=coffeescript_1

os: linux
dist: bionic
node_js: $NODEVER
env: TEST_SCRIPT=coffeescript_1

os: osx
osx_image: xcode11
node_js: $NODEVER
env: TEST_SCRIPT=coffeescript_2

os: linux
dist: bionic
node_js: $NODEVER
env: TEST_SCRIPT=coffeescript_2

os: osx
osx_image: xcode11
node_js: $NODEVER
env: TEST_SCRIPT=datetime

os: linux
dist: bionic
node_js: $NODEVER
env: TEST_SCRIPT=datetime
before_install:

if [ “$TRAVIS_OS_NAME” = “linux” ]; then sudo apt-get install nasm squashfs-tools gcc g++; CXX=“g+±${GCCMAINVER}” && CC=“gcc-${GCCMAINVER}”; fi

if [ “$TRAVIS_OS_NAME” = “osx” ]; then brew update; brew install nasm openssl squashfs “llvm@$GCCMAINVER”; fi

rvm install “${RUBY_VER}”
addons:
apt:
sources:

ubuntu-toolchain-r-test
packages:

“gcc-${GCCMAINVER}”

“g+±${GCCMAINVER}”
install:

if [ “$TRAVIS_OS_NAME” = “osx” ]; then export PRJROOT_DIR=“$OSXPRJDIR”; clang --version; fi

if [ “$TRAVIS_OS_NAME” = “linux” ]; then export PRJROOT_DIR=“$LINPRJDIR”; fi

mkdir -p $NODEC_TESTS_TMPDIR

git clone --depth 1 GitHub - jashkenas/coffeescript: Unfancy JavaScript

cd $PRJROOT_DIR
before_script:

python --version

gcc --version

g++ --version

nasm -v

mksquashfs -version

ruby --version

node --version

npm --version
script:

ruby tests/$TEST_SCRIPT || exit $?

Basically, I am compiling an executable that requires Node.js, Ruby and C or C++ or both (I am not sure) as I am forking a project here: https://github.com/slee047/node-packer

Here is my build URL: https://travis-ci.org/slee047/node-packer/builds/569336291

I have been consistently failing in macOS test case because it is not using GCC-7 despite I have tried to install it via homebrew. This is what the system show when I run gcc --version:

Configured with: --prefix=/Applications/Xcode-11.0.app/Contents/Developer/usr --with-gxx-include-dir=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/4.2.1 Apple clang version 11.0.0 (clang-1100.0.32.5) Target: x86_64-apple-darwin18.5.0 Thread model: posix InstalledDir: /Applications/Xcode-11.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Log URL: https://api.travis-ci.org/v3/job/569336294/log.txt

So how can I change my YAML file such that it will start using GCC 7 for the compilation?

Farwaykorse · August 8, 2019, 6:38pm

By default gcc and g++ on OSX point to the AppleClang compiler. Like you do on Linux you can choose a specific compiler executable.

before_install:
- |
  if [[ ${TRAVIS_OS_NAME} == "osx" ]]; then
    eval "CC=gcc-7 && CXX=g++-7"
  fi

Note: In your script you are installing LLVM on OSX, not GCC.
Is this what you intended? Then you’ll have to call the compiler not with gcc and g++, but with clang-7 and clang++-7.
If you want to use GCC-7 on both Linux and OSX, than you can drop the test for the OS.

Suggestion: Why use such extensive scripts to set versions?
The YAML configuration to install the dependencies, seems to me easier to read and maintain:

addons:
  apt:
    packages:
    - nasm
    - squashfs-tools
  homebrew:
    packages:
    - nasm
    - openssl
    - squashfs
    - gcc@7

Both GCC 7 and LLVM/clang 7 come pre-installed on the Linux image bionic.

native-api · August 9, 2019, 4:27pm

In an OSX job, did you notice this message from the llvm@7 formula in the log?

To use the bundled libc++ please add the following LDFLAGS:
  LDFLAGS="-L/usr/local/opt/llvm@7/lib -Wl,-rpath,/usr/local/opt/llvm@7/lib"

llvm@7 is keg-only, which means it was not symlinked into /usr/local,
because this is an alternate version of another formula.

If you need to have llvm@7 first in your PATH run:
  echo 'export PATH="/usr/local/opt/llvm@7/bin:$PATH"' >> ~/.bash_profile

For compilers to find llvm@7 you may need to set:
  export LDFLAGS="-L/usr/local/opt/llvm@7/lib"
  export CPPFLAGS="-I/usr/local/opt/llvm@7/include"

slee047 · August 10, 2019, 8:43am

Eventually, I have found that the reason why I have failed to compile is due to the use of XCode 11 and some test cases may need some bug fix (Non-YAML / GCC / LLVM related).

I can pass the test in OSX now even with the much simplified YAML (Previously, I thought that it has something to do with the updates etc.)

Build Success in macOS only: https://travis-ci.org/slee047/node-packer/builds/570121410

Thank you very much.

slee047 · August 10, 2019, 8:45am

Ok, I will take a look and see if this method helps or not (In XCode 11, it fails). Right now, I realized that I can compile this with default XCode 10.2 without installing gcc / g++ or llvm.

The build that fails with the use of XCode 11: https://travis-ci.org/slee047/node-packer/jobs/570150107

native-api · August 10, 2019, 10:19am

-> cd /tmp/nodec_tests_tmpdir/node-10.16.2-1.6.0
-> Running ["./configure "]
Did not find a new enough assembler, install one or build with
       --openssl-no-asm.
       Please refer to BUILDING.md
Failed running ["./configure "]

Searching “Did not find a new enough assembler” in the node-10.16.2 source code shows that it’s triggered by this check:

is_x86 = 'x64' in variables['target_arch'] or 'ia32' in variables['target_arch']

# supported asm compiler for AVX2. See https://github.com/openssl/openssl/
# blob/OpenSSL_1_1_0-stable/crypto/modes/asm/aesni-gcm-x86_64.pl#L52-L69
openssl110_asm_supported = \
  ('gas_version' in variables and float(variables['gas_version']) >= 2.23) or \
  ('xcode_version' in variables and float(variables['xcode_version']) >= 5.0) or \
  ('llvm_version' in variables and float(variables['llvm_version']) >= 3.3) or \
  ('nasm_version' in variables and float(variables['nasm_version']) >= 2.10)

if is_x86 and not openssl110_asm_supported:
  error('''Did not find a new enough assembler, install one or build with
   --openssl-no-asm.
   Please refer to BUILDING.md''')

slee047 · August 10, 2019, 10:44am

xcode_version should be 11.0, and my nasm -v prints the following:

NASM version 2.14.02 compiled on Dec 27 2018

So I think it could be a bug in XCode 11 or sort of, I don’t have this issue when I am using XCode 10.2 or lower in YAML. There is another compilation issues for Linux test cases though, but I shall leave that in Linux sub-forum.

slee047 · August 11, 2019, 2:16am

Despite the attempt in the YAML file:

addons:
  homebrew:
    packages:
      - nasm
      - openssl
      - squashfs
      - llvm@8
matrix:
  include:
  - os: osx
    osx_image: xcode11
    node_js: $NODEVER
    env: TEST_SCRIPT=coffeescript_1
install:
  - if [ "$TRAVIS_OS_NAME" = "osx" ]; then export PRJROOT_DIR="$OSXPRJDIR"; export PATH="/usr/local/opt/llvm@8/bin:$PATH"; export LDFLAGS="-L/usr/local/opt/llvm@8/lib -Wl,-rpath,/usr/local/opt/llvm@8/lib"; export CPPFLAGS="-I/usr/local/opt/llvm@8/include"; clang --version; fi
  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then export PRJROOT_DIR="$LINPRJDIR"; export CXX="g++-9" CC="g++-9"; gcc -- version; g++ -- version; fi
  - mkdir -p $NODEC_TESTS_TMPDIR
  - git clone --depth 1 https://github.com/jashkenas/coffeescript.git
  - cd $PRJROOT_DIR

It still failed with the same error

Log:

Therefore, I believe that it is XCode 11 related image issue. Perhaps I will try again when macOS 10.15 is released.

native-api · August 11, 2019, 5:12am

That’s for linking to other libraries. To use the compiler as an executable, add it to PATH.

You can also request debug mode for your repo by sending an e-mail to support@travis-ci.com and/or debug that Python code to find out what the erroneous values are and where they come from.

Also maybe related:

slee047 · August 11, 2019, 7:02am

Thanks for the patience in this issue.

Apparently there are several reasons why the test fails, and it is separated by OS environment.

For macOS alone, I can confirm that

XCode 10.2 works without the need of installing GCC-7 or LLVM-7 separately, but the XCode 11 environment just fails.
Job log:
https://travis-ci.org/slee047/node-packer/jobs/570410532
Some timeout issue (Typically happens in only one of the 3 test cases)
Some invalid test cases (Or rather, cases in the test suite may have not updated). This happens in only one of my 3 test scenarios, but it can be considered as fixed.

Therefore, I will write in support instead. Thank you very much.

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