[travis] Extra build without compat tests

.travis.yml

@@ -22,6 +22,11 @@ matrix:
       env: pymajor=3 coverage=1
       dist: xenial
       sudo: true
+    - python: "3.7"
+      os: linux
+      env: pymajor=3 coverage=1 nocompat=1
+      dist: xenial
+      sudo: true
     - language: generic
       os: osx
       env: pymajor=2
@@ -56,25 +61,28 @@ addons:
       - libboost-all-dev
 
 before_install:
-  - nixprefix="/usr/local"
-  - export NIX_INCDIR=${nixprefix}/include/nixio-1.0
-  - export NIX_LIBDIR=${nixprefix}/lib
-  - export PKG_CONFIG_PATH=${PKG_CONFIG_PATH}:${nixprefix}/lib/pkgconfig
+  # build nix for compat tests
+  if [[ -z "${nocompat}" ]]; then
+    nixprefix="/usr/local";
+    export NIX_INCDIR=${nixprefix}/include/nixio-1.0;
+    export NIX_LIBDIR=${nixprefix}/lib;
+    export PKG_CONFIG_PATH=${PKG_CONFIG_PATH}:${nixprefix}/lib/pkgconfig;
+    git clone --branch ${NIX_BRANCH} https://github.com/G-Node/nix /tmp/libnix;
+    pushd /tmp/libnix;
+    mkdir build;
+    pushd build;
+    cmake -DCMAKE_INSTALL_PREFIX=${nixprefix} ..;
+    make;
+    sudo make install;
+    popd;
+    popd;
+  fi
   # For macOS python3
   - export PATH="/usr/local/opt/python@3.8/bin:$PATH"
   - alias pip2='pip'
   - if [[ "${TRAVIS_OS_NAME}" != "osx" ]]; then pip${pymajor} install --upgrade numpy; fi
   - pip${pymajor} install --upgrade h5py pytest pytest-xdist pytest-cov six;
   - if [[ "${pymajor}" == 2 ]]; then pip${pymajor} install enum34; fi
-  - git clone --branch ${NIX_BRANCH} https://github.com/G-Node/nix /tmp/libnix
-  - pushd /tmp/libnix
-  - mkdir build
-  - pushd build
-  - cmake -DCMAKE_INSTALL_PREFIX=${nixprefix} ..
-  - make
-  - sudo make install
-  - popd
-  - popd
   - which pip${pymajor}
   - which python${pymajor}
   - python${pymajor} --version
@@ -83,7 +91,11 @@ install:
   - python${pymajor} setup.py build
 
 script:
-  - pytest --cov=nixio --nix-compat -nauto;
+  - if [[ "${nocompat}" == 1 ]]; then
+      pytest --cov=nixio -nauto;
+    else
+      pytest --cov=nixio --nix-compat -nauto;
+    fi
 
 after_success:
   - if [[ "${coverage}" == 1 ]]; then