A Travis to monero

Add a Travis build script for Monero. This was blatantly copied from
Bitcoin. It spawns jobs in docker containers running an ubuntu bionic
image.

This commit also a fixes a problem where librt was still linked, even
when compiling statically.

.travis.yml

@@ -0,0 +1,63 @@
+sudo: required
+dist: trusty
+os: linux
+language: minimal
+cache:
+  directories:
+  - contrib/depends/built
+  - contrib/depends/sdk-sources
+  - $HOME/.ccache
+env:
+  global:
+    - MAKEJOBS=-j3
+    - RUN_TESTS=false
+    - BOOST_TEST_RANDOM=1$TRAVIS_BUILD_ID
+    - CCACHE_SIZE=100M
+    - CCACHE_TEMPDIR=/tmp/.ccache-temp
+    - CCACHE_COMPRESS=1
+    - CCACHE_DIR=$HOME/.ccache
+    - BASE_OUTDIR=$TRAVIS_BUILD_DIR/out
+    - SDK_URL=https://bitcoincore.org/depends-sources/sdks
+    - PYTHON_DEBUG=1
+    - WINEDEBUG=fixme-all
+    - DOCKER_PACKAGES="build-essential libtool cmake autotools-dev automake pkg-config bsdmainutils curl git ca-certificates ccache"
+  matrix:
+# ARM v7
+    - HOST=arm-linux-gnueabihf PACKAGES="g++-arm-linux-gnueabihf"
+# ARM v8
+    - HOST=aarch64-linux-gnu PACKAGES="g++-aarch64-linux-gnu"
+# i686 Linux
+    - HOST=i686-pc-linux-gnu PACKAGES="cmake g++-multilib bc python3-zmq" RUN_TESTS=true
+# Win64
+    - HOST=x86_64-w64-mingw32 PACKAGES="cmake python3 nsis g++-mingw-w64-x86-64 wine-binfmt wine64 bc" RUN_TESTS=true
+# x86_64 Linux
+    - HOST=x86_64-unknown-linux-gnu PACKAGES="cmake python3-zmq protobuf-compiler libdbus-1-dev libharfbuzz-dev libprotobuf-dev" RUN_TESTS=true
+# Cross-Mac
+    - HOST=x86_64-apple-darwin11 PACKAGES="cmake imagemagick libcap-dev librsvg2-bin libz-dev libbz2-dev libtiff-tools python-dev python3-setuptools-git" OSX_SDK=10.11
+
+before_install:
+    - export PATH=$(echo $PATH | tr ':' "\n" | sed '/\/opt\/python/d' | tr "\n" ":" | sed "s|::|:|g")
+install:
+    - env | grep -E '^(CCACHE_|WINEDEBUG|DISPLAY|BOOST_TEST_RANDOM|CONFIG_SHELL)' | tee /tmp/env
+    - if [[ $HOST = *-mingw32 ]]; then DOCKER_ADMIN="--cap-add SYS_ADMIN"; fi
+    - DOCKER_ID=$(docker run $DOCKER_ADMIN -idt --mount type=bind,src=$TRAVIS_BUILD_DIR,dst=$TRAVIS_BUILD_DIR --mount type=bind,src=$CCACHE_DIR,dst=$CCACHE_DIR -w $TRAVIS_BUILD_DIR --env-file /tmp/env ubuntu:18.04)
+    - DOCKER_EXEC="docker exec $DOCKER_ID"
+    - if [ -n "$DPKG_ADD_ARCH" ]; then $DOCKER_EXEC dpkg --add-architecture "$DPKG_ADD_ARCH" ; fi
+    - travis_retry $DOCKER_EXEC apt-get update
+    - travis_retry $DOCKER_EXEC apt-get install --no-install-recommends --no-upgrade -qq $PACKAGES $DOCKER_PACKAGES
+before_script:
+    - mkdir -p contrib/depends/SDKs contrib/depends/sdk-sources
+    - if [ -n "$OSX_SDK" -a ! -f contrib/depends/sdk-sources/MacOSX${OSX_SDK}.sdk.tar.gz ]; then curl --location --fail $SDK_URL/MacOSX${OSX_SDK}.sdk.tar.gz -o contrib/depends/sdk-sources/MacOSX${OSX_SDK}.sdk.tar.gz; fi
+    - if [ -n "$OSX_SDK" -a -f contrib/depends/sdk-sources/MacOSX${OSX_SDK}.sdk.tar.gz ]; then tar -C contrib/depends/SDKs -xf contrib/depends/sdk-sources/MacOSX${OSX_SDK}.sdk.tar.gz; fi
+    - if [[ $HOST = *-mingw32 ]]; then $DOCKER_EXEC bash -c "update-alternatives --set $HOST-g++ \$(which $HOST-g++-posix)"; fi
+    - if [ -z "$NO_DEPENDS" ]; then $DOCKER_EXEC bash -c "CONFIG_SHELL= make $MAKEJOBS -C contrib/depends HOST=$HOST $DEP_OPTS"; fi
+script:
+    - git submodule init && git submodule update
+    - export TRAVIS_COMMIT_LOG=`git log --format=fuller -1`
+    - OUTDIR=$BASE_OUTDIR/$TRAVIS_PULL_REQUEST/$TRAVIS_JOB_NUMBER-$HOST
+    - if [ -z "$NO_DEPENDS" ]; then $DOCKER_EXEC ccache --max-size=$CCACHE_SIZE; fi
+    - $DOCKER_EXEC bash -c "mkdir build && cd build && cmake -DCMAKE_TOOLCHAIN_FILE=$TRAVIS_BUILD_DIR/contrib/depends/$HOST/share/toolchain.cmake .. && make $MAKEJOBS"
+    - export LD_LIBRARY_PATH=$TRAVIS_BUILD_DIR/contrib/depends/$HOST/lib
+after_script:
+    - echo $TRAVIS_COMMIT_RANGE
+    - echo $TRAVIS_COMMIT_LOG

CMakeLists.txt

@@ -850,7 +850,7 @@ elseif(DRAGONFLY)
   set(EXTRA_LIBRARIES execinfo ${COMPAT})
 elseif(CMAKE_SYSTEM_NAME MATCHES "(SunOS|Solaris)")
   set(EXTRA_LIBRARIES socket nsl resolv)
-elseif(NOT MSVC)
+elseif(NOT MSVC AND NOT DEPENDS)
   find_library(RT rt)
   set(EXTRA_LIBRARIES ${RT})
 endif()