Fixes for CI

* Fix warning that not including a cmake source or build dir will be a fatal error (it is now on newest CMakes)
    * Fixes appveyor
* Travis uses CMake 3.9 for more than a year now
* Travis dropped sudo: false in December
* Dropping Sphinx 2

Author: henryiii

.appveyor.yml

@@ -62,6 +62,7 @@ build_script:
     -DPYBIND11_WERROR=ON
     -DDOWNLOAD_CATCH=ON
     -DCMAKE_SUPPRESS_REGENERATION=1
+    .
 - set MSBuildLogger="C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
 - cmake --build . --config %CONFIG% --target pytest -- /m /v:m /logger:%MSBuildLogger%
 - cmake --build . --config %CONFIG% --target cpptest -- /m /v:m /logger:%MSBuildLogger%

.travis.yml

@@ -1,6 +1,5 @@
 language: cpp
 dist: trusty
-sudo: false
 matrix:
   include:
   # This config does a few things:
@@ -17,8 +16,8 @@ matrix:
     - pyenv global $(pyenv whence 2to3)  # activate all python versions
     - PY_CMD=python3
     - $PY_CMD -m pip install --user --upgrade pip wheel setuptools
-    install:
-    - $PY_CMD -m pip install --user --upgrade sphinx sphinx_rtd_theme breathe flake8 pep8-naming pytest
+    install: # Breathe does not yet support Sphinx 2
+    - $PY_CMD -m pip install --user --upgrade "sphinx<2" sphinx_rtd_theme breathe flake8 pep8-naming pytest
     - curl -fsSL https://sourceforge.net/projects/doxygen/files/rel-1.8.15/doxygen-1.8.15.linux.bin.tar.gz/download | tar xz
     - export PATH="$PWD/doxygen-1.8.15/bin:$PATH"
     script:
@@ -33,7 +32,7 @@ matrix:
       diff -rq $installed ./include/pybind11
     - |
       # Barebones build
-      cmake -DCMAKE_BUILD_TYPE=Debug -DPYBIND11_WERROR=ON -DDOWNLOAD_CATCH=ON -DPYTHON_EXECUTABLE=$(which $PY_CMD)
+      cmake -DCMAKE_BUILD_TYPE=Debug -DPYBIND11_WERROR=ON -DDOWNLOAD_CATCH=ON -DPYTHON_EXECUTABLE=$(which $PY_CMD) .
       make pytest -j 2
       make cpptest -j 2
   # The following are regular test configurations, including optional dependencies.
@@ -49,21 +48,34 @@ matrix:
       apt:
         sources: [deadsnakes]
         packages: [python3.6-dev python3.6-venv, cmake=2.\*, cmake-data=2.\*]
-  - sudo: true
-    services: docker
+  - services: docker
     env: PYTHON=2.7 CPP=14 GCC=6 CMAKE=1
-  - sudo: true
-    services: docker
+  - services: docker
     env: PYTHON=3.5 CPP=14 GCC=6 DEBUG=1
-  - sudo: true
-    services: docker
-    env: PYTHON=3.6 CPP=17 GCC=7
+  - env: PYTHON=3.6 CPP=17 GCC=7
+    addons:
+      apt:
+        sources:
+          - deadsnakes
+          - ubuntu-toolchain-r-test
+        packages:
+          - python3.6-dev
+          - python3.6-venv
+          - g++-7
   - os: linux
-    env: PYTHON=3.6 CPP=17 CLANG=5.0
+    env: PYTHON=3.6 CPP=17 CLANG=7
     addons:
       apt:
-        sources: [deadsnakes, llvm-toolchain-trusty-5.0, ubuntu-toolchain-r-test]
-        packages: [python3.6-dev python3.6-venv clang-5.0 llvm-5.0-dev, lld-5.0]
+        sources:
+          - deadsnakes
+          - llvm-toolchain-trusty-7
+        packages:
+          - python3.6-dev
+          - python3.6-venv
+          - clang-7
+          - llvm-7-dev
+          - lld-7
+          - libstdc++7
   - os: osx
     osx_image: xcode7.3
     env: PYTHON=2.7 CPP=14 CLANG CMAKE=1
@@ -72,18 +84,17 @@ matrix:
     env: PYTHON=3.7 CPP=14 CLANG DEBUG=1
   # Test a PyPy 2.7 build
   - os: linux
-    env: PYPY=5.8 PYTHON=2.7 CPP=11 GCC=4.8
+    env: PYPY=7.1 PYTHON=2.7 CPP=11 GCC=4.8
     addons:
       apt:
         packages: [libblas-dev, liblapack-dev, gfortran]
   # Build in 32-bit mode and tests against the CMake-installed version
-  - sudo: true
-    services: docker
+  - services: docker
     env: ARCH=i386 PYTHON=3.5 CPP=14 GCC=6 INSTALL=1
     script:
       - |
         $SCRIPT_RUN_PREFIX sh -c "set -e
-        cmake ${CMAKE_EXTRA_ARGS} -DPYBIND11_INSTALL=1 -DPYBIND11_TEST=0
+        cmake ${CMAKE_EXTRA_ARGS} -DPYBIND11_INSTALL=1 -DPYBIND11_TEST=0 .
         make install
         cp -a tests /pybind11-tests
         mkdir /build-tests && cd /build-tests
@@ -131,9 +142,9 @@ before_install:
     SCRIPT_RUN_PREFIX="docker exec --tty $containerid"
     $SCRIPT_RUN_PREFIX sh -c 'for s in 0 15; do sleep $s; apt-get update && apt-get -qy dist-upgrade && break; done'
   else
-    if [ "$PYPY" = "5.8" ]; then
-      curl -fSL https://bitbucket.org/pypy/pypy/downloads/pypy2-v5.8.0-linux64.tar.bz2 | tar xj
-      PY_CMD=$(echo `pwd`/pypy2-v5.8.0-linux64/bin/pypy)
+    if [ "$PYPY" = "7.1" ]; then
+      curl -fSL https://bitbucket.org/pypy/pypy/downloads/pypy2.7-v7.1.0-linux64.tar.bz2 | tar xj
+      PY_CMD=$(echo `pwd`/pypy2.7-v7.1.0-linux64/bin/pypy)
       CMAKE_EXTRA_ARGS+=" -DPYTHON_EXECUTABLE:FILEPATH=$PY_CMD"
     else
       PY_CMD=python$PYTHON
@@ -148,12 +159,14 @@ before_install:
     if [ "$PY" = 3 ] || [ -n "$PYPY" ]; then
       $PY_CMD -m ensurepip --user
     fi
+    $PY_CMD --version
     $PY_CMD -m pip install --user --upgrade pip wheel
   fi
   set +e
 install:
 - |
   # Install dependencies
+  cmake --version
   set -e
   if [ -n "$DOCKER" ]; then
     if [ -n "$DEBUG" ]; then
@@ -166,26 +179,8 @@ install:
         libeigen3-dev libboost-dev cmake make ${EXTRA_PACKAGES} && break; done"
   else
 
-    if [ "$CLANG" = "5.0" ]; then
-      if ! [ -d ~/.local/include/c++/v1 ]; then
-        # Neither debian nor llvm provide a libc++ 5.0 deb; luckily it's fairly quick
-        # to build, install (and cache), so do it ourselves:
-        git clone --depth=1 https://github.com/llvm-mirror/llvm.git llvm-source
-        git clone https://github.com/llvm-mirror/libcxx.git llvm-source/projects/libcxx -b release_50
-        git clone https://github.com/llvm-mirror/libcxxabi.git llvm-source/projects/libcxxabi -b release_50
-        mkdir llvm-build && cd llvm-build
-        # Building llvm requires a newer cmake than is provided by the trusty container:
-        CMAKE_VER=cmake-3.8.0-Linux-x86_64
-        curl https://cmake.org/files/v3.8/$CMAKE_VER.tar.gz | tar xz
-        ./$CMAKE_VER/bin/cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=~/.local ../llvm-source
-        make -j2 install-cxxabi install-cxx
-        cp -a include/c++/v1/*cxxabi*.h ~/.local/include/c++/v1
-        cd ..
-      fi
-      export CXXFLAGS="-isystem $HOME/.local/include/c++/v1 -stdlib=libc++"
-      export LDFLAGS="-L$HOME/.local/lib -fuse-ld=lld-$CLANG"
-      export LD_LIBRARY_PATH="$HOME/.local/lib${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
-      if [ "$CPP" = "-std=c++17" ]; then CPP="-std=c++1z"; fi
+    if [ "$CLANG" = "7" ]; then
+      export CXXFLAGS="-stdlib=libc++"
     fi
 
     export NPY_NUM_BUILD_JOBS=2
@@ -206,6 +201,7 @@ script:
     -DPYBIND11_CPP_STANDARD=$CPP
     -DPYBIND11_WERROR=${WERROR:-ON}
     -DDOWNLOAD_CATCH=${DOWNLOAD_CATCH:-ON}
+    .
 - $SCRIPT_RUN_PREFIX make pytest -j 2
 - $SCRIPT_RUN_PREFIX make cpptest -j 2
 - if [ -n "$CMAKE" ]; then $SCRIPT_RUN_PREFIX make test_cmake_build; fi