add travis autobuild scripts (courtesy of EmuTOS project)

.travis.yml

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+# BaS_gcc build script for Travis CI
+# This will automatically be run on every push to GitHub
+# Build History: https://travis-ci.org/firebee-org/BaS_gcc/builds/
+
+language: c
+os: linux
+dist: trusty
+sudo: required
+
+before_install:
+  # Install our SSH key pair
+  - .travis/install_ssh_id.sh
+  - unset SSH_ID
+  # Register third-party APT repositories
+  - sudo .travis/register_apt_repositories.sh
+  # Install additional packages
+  - sudo apt-get install -y cross-mint-essential dos2unix lftp
+  # Display packages versions
+  - git --version
+  - make --version
+  - ld --version
+  - gcc --version
+  - m68k-atari-mint-ld --version
+  - m68k-atari-mint-gcc --version
+  - tar --version
+  - unix2dos --version
+  - lftp --version
+
+script:
+  # Set FIXED_TRAVIS_COMMIT_RANGE
+  - . .travis/fix_travis_commit_range.sh
+  # Build binaries
+  - export VERSION=$(date -u +%Y%m%d-%H%M%S)-$(git rev-parse --short $TRAVIS_COMMIT)
+  - make clean
+  - make all
+  # Add README.txt
+  - .travis/generate-readme.sh >release-archives/README.md
+  # Display resulting tree
+  - ls -l release-archives
+
+deploy:
+  skip_cleanup: true
+  provider: script
+  script: .travis/deploy.sh
+  on:
+    repo: firebee-org/BaS_gcc
+    branch: master

.travis/deploy.sh

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+#!/bin/bash -eu
+# -e: Exit immediately if a command exits with a non-zero status.
+# -u: Treat unset variables as an error when substituting.
+
+echo "no deployment step implemented (yet)"

.travis/fix_travis_commit_range.sh

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+# This script fragment must be sourced by the main script file
+# in order to define the FIXED_TRAVIS_COMMIT_RANGE variable
+# . .travis/fix_travis_commit_range.sh
+
+# TRAVIS_COMMIT_RANGE uses triple-dot syntax to specify which commits have
+# triggered the build. This is wrong. In case of forced push, the previous
+# commit is not an ancestor of the last commit, so it is not present in the
+# cloned repository. And also, the range contains unrelated commits.
+# https://docs.travis-ci.com/user/environment-variables/
+# https://git-scm.com/book/tr/v2/Git-Tools-Revision-Selection
+# https://github.com/travis-ci/travis-ci/issues/4596
+#
+# The solution is to use double-dot syntax instead.
+# In case of forced push, we can't know the previous commit. So we just use
+# the parent commit as previous one.
+
+echo TRAVIS_COMMIT_RANGE=$TRAVIS_COMMIT_RANGE
+
+PREVIOUS_COMMIT=$(echo $TRAVIS_COMMIT_RANGE | sed 's/\.\.\..*//')
+CURRENT_COMMIT=$TRAVIS_COMMIT
+
+if ! git merge-base --is-ancestor $PREVIOUS_COMMIT $CURRENT_COMMIT 2>/dev/null
+then
+  # Forced push: use parent commit as previous commit
+  PREVIOUS_COMMIT=$CURRENT_COMMIT~
+fi
+
+# Normalize commits
+PREVIOUS_COMMIT=$(git rev-parse --short $PREVIOUS_COMMIT)
+CURRENT_COMMIT=$(git rev-parse --short $CURRENT_COMMIT)
+
+export FIXED_TRAVIS_COMMIT_RANGE=$PREVIOUS_COMMIT..$CURRENT_COMMIT
+echo FIXED_TRAVIS_COMMIT_RANGE=$FIXED_TRAVIS_COMMIT_RANGE
+
+unset PREVIOUS_COMMIT CURRENT_COMMIT

.travis/generate-purge.sh

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+#!/bin/bash -u
+# -u: Treat unset variables as an error when substituting.
+
+# Purpose: Purge old snapshots
+# Input: output of lftp "ls" command
+# Output: lftp "rm -r" commands
+
+# Number of days of retention before purge
+days_retention=7
+
+# But always keep a minimal number of snapshots
+min_keep=5
+
+# Every snapshot up to this day will be purged
+last_day_purge=$(date -u +%Y%m%d --date "$days_retention days ago")
+
+# Current number of snapshots kept
+n=0
+
+# Read each remote file, as output from lftp "ls" command
+while read flags links user group size month day hour f
+do
+  # Skip non-snapshots
+  if [[ ! $f =~ ^[0-9]*-[0-9]*-[0-9a-z]* ]]
+  then
+    continue
+  fi
+
+  echo $f
+
+  # Then reverse sort to have last snapshots first
+done | sort -r | while read f
+do
+  # This is one more snapshot
+  (( n++ ))
+
+  # Do not purge until minimal number of snapshots
+  if [ $n -le $min_keep ]
+  then
+    echo "echo '#keep $f'"
+    continue
+  fi
+
+  # Purge old snapshots
+  day=$(echo $f | cut -d - -f 1)
+  if [ $day -le $last_day_purge ]
+  then
+    echo "echo 'rm -r $f'"
+    echo "rm -r $f"
+  else
+    echo "echo '#keep $f'"
+  fi
+done

.travis/generate-readme.sh

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+#!/bin/bash -eu
+# -e: Exit immediately if a command exits with a non-zero status.
+# -u: Treat unset variables as an error when substituting.
+
+# See .travis/fix_travis_commit_range.sh for details about the commit range.
+
+# The argument for GitHub /compare/ requires 3 dots.
+COMPARE_ARG=$(echo $FIXED_TRAVIS_COMMIT_RANGE | sed 's/\.\./.../')
+
+echo "These binaries have been produced by"
+echo "[Travis CI Build #$TRAVIS_BUILD_NUMBER](https://travis-ci.org/firebee-org/BaS_gcc/builds/$TRAVIS_BUILD_ID)"
+echo "for commits [$FIXED_TRAVIS_COMMIT_RANGE](https://github.com/firebee-org/BaS_gcc/compare/$COMPARE_ARG)."
+echo
+
+# Generate log as preformatted text with hyperlinks
+git log --name-status $FIXED_TRAVIS_COMMIT_RANGE -- | sed \
+  -e 's|.*|``&``  |' \
+  -e 's|[a-z]\+://[^ `]*|``\[&\](&)``|g' \
+  -e 's|commit \([0-9a-f]\+\)|commit`` \[\1\](https://github.com/firebee-org/BaS_gcc/commit/\1) ``|g' \
+  -e 's|````||g'

.travis/install_ssh_id.sh

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+#!/bin/bash -eu
+# -e: Exit immediately if a command exits with a non-zero status.
+# -u: Treat unset variables as an error when substituting.
+
+# This installs an SSH private/public key pair on the build system,
+# so ssh can connect to remote servers without password.
+# Important: for passwordless connection to succeed, our public key must be
+# manually authorized on the remote server.
+
+# Our private key is the critical security component, it must remain secret.
+# We store it in the SSH_ID environment variable in Travis CI project settings.
+# As environment variables can only contain text, our key files are transformed
+# like this: tar, xz, base64. Then then can be decoded here. This is safe as
+# Travis CI never shows the contents of secure variables.
+
+# To generate the contents of the SSH_ID variable:
+# Be sure to be in an empty, temporary directory.
+#
+# mkdir .ssh
+# ssh-keygen -t rsa -b 4096 -C travis-ci.org/firebee-org/BaS_gcc -N '' -f .ssh/id_rsa
+# tar Jcvf id_firebee-org_BaS_gcc.tar.xz .ssh
+# base64 -w 0 id_firebee-org_BaS_gcc.tar.xz
+#
+# Select the resulting encoded text (several lines) to copy it to the clipboard.
+# Then go to the Travis CI project settings:
+# https://travis-ci.org/firebee-org/BaS_gcc/settings
+# Create a new environment variable named SSH_ID, and paste the value.
+# The script below will recreate the key files from that variable contents.
+
+if [ -z ${SSH_ID+x} ]
+then
+  echo "error: SSH_ID is undefined" >&2
+  exit 1
+fi
+
+echo $SSH_ID | base64 -d | tar -C ~ -Jx
+ls -l ~/.ssh

.travis/register_apt_repositories.sh

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+#!/bin/bash -eu
+# -e: Exit immediately if a command exits with a non-zero status.
+# -u: Treat unset variables as an error when substituting.
+
+if [ $UID != 0 ]
+then
+  echo "error: This script needs to be run with root access rights." 2>&1
+  exit 1
+fi
+
+# Display expanded script commands
+set -x
+
+# Vincent Rivière's m68k-atari-mint cross-tools
+# http://vincent.riviere.free.fr/soft/m68k-atari-mint/ubuntu.php
+sudo add-apt-repository -y ppa:vriviere/ppa
+
+# Update the packages list
+apt-get update -qq