Upgrade testing from trusty to xenial, and also:

* From openjdk-7 via apt to openjdk-11 via Travis CI xenial's $JAVA_HOME
* From mingw 4.8 -> 5.3, as supported by xenial
* clang+llvm for csa kept at version 6.0.0, but for ubuntu-16.04
* Furthermore xenial implicitly has many upgrades, specifically:
  - gcc 4.8.4 -> 5.4.0
  - clang 4.0.0 -> 5.0.0
  - cmake 3.9.2 -> 3.12.4
  - python 3.4.3 -> 3.5.2
* cppcheck version kept at 1.61 (for trusty) due to many
  false positives with version 1.72 (for xenial)
* Community code contribution documentation simplified to remove
  version of cppcheck, as this may outdated with updates to scripts

6 files changed, 15 insertions, 13 deletions

diff --git a/travis/before_install_apt.sh b/travis/before_install_apt.sh
index aea7a8d3..b40f0ced 100755
--- a/travis/before_install_apt.sh
+++ b/travis/before_install_apt.sh
@@ -4,4 +4,4 @@
 # "global" before_install script.
 
 sudo apt-get update -qq
-sudo apt-get install -qq python3-pip
+sudo apt-get install -qq python3-pip python3-setuptools
diff --git a/travis/csa/before_install.sh b/travis/csa/before_install.sh
index cdd58257..c2e29064 100755
--- a/travis/csa/before_install.sh
+++ b/travis/csa/before_install.sh
@@ -7,7 +7,7 @@ set -e
 
 sudo apt-get install -qq sqlite3 libsqlite3-dev
 
-CLANG_LLVM=clang+llvm-6.0.0-x86_64-linux-gnu-ubuntu-14.04
+CLANG_LLVM=clang+llvm-6.0.0-x86_64-linux-gnu-ubuntu-16.04
 wget http://releases.llvm.org/6.0.0/$CLANG_LLVM.tar.xz
 tar xJf $CLANG_LLVM.tar.xz
 mv $CLANG_LLVM clang+llvm-6
diff --git a/travis/install.sh b/travis/install.sh
index 2363be43..0eaff801 100755
--- a/travis/install.sh
+++ b/travis/install.sh
@@ -34,8 +34,8 @@ cd $TAR_DIRECTORY
 # autoconf build from generated tarball
 mkdir build_autoconf
 cd build_autoconf
-if [ -f /usr/lib/jvm/java-7-openjdk-amd64/include/jni.h ]; then
-    CXXFLAGS="-I/usr/lib/jvm/java-7-openjdk-amd64/include -I/usr/lib/jvm/java-7-openjdk-amd64/include/linux $CXXFLAGS" ../configure --prefix=/tmp/proj_autoconf_install_from_dist_all --with-jni
+if [ -f $JAVA_HOME/include/jni.h ]; then
+    CXXFLAGS="-I$JAVA_HOME/include -I$JAVA_HOME/include/linux $CXXFLAGS" ../configure --prefix=/tmp/proj_autoconf_install_from_dist_all --with-jni
 else
     ../configure --prefix=/tmp/proj_autoconf_install_from_dist_all
 fi
diff --git a/travis/linux_gcc/before_install.sh b/travis/linux_gcc/before_install.sh
index 30793e69..4dbd52c3 100755
--- a/travis/linux_gcc/before_install.sh
+++ b/travis/linux_gcc/before_install.sh
@@ -6,19 +6,22 @@ set -e
 ./travis/before_install_pip.sh
 
 sudo apt-get install -qq \
-        cppcheck \
         lcov \
         doxygen graphviz \
-        openjdk-7-jdk \
         sqlite3 libsqlite3-dev
 
+# Install Cppcheck to maintain version 1.61
+LIBTINYXML=libtinyxml2-0.0.0_0~git20120518.1.a2ae54e-1_amd64.deb
+CPPCHECK=cppcheck_1.61-1_amd64.deb
+wget -q http://security.ubuntu.com/ubuntu/pool/universe/t/tinyxml2/$LIBTINYXML
+wget -q http://security.ubuntu.com/ubuntu/pool/universe/c/cppcheck/$CPPCHECK
+sudo dpkg -i $LIBTINYXML
+sudo dpkg -i $CPPCHECK
+
 scripts/cppcheck.sh
 scripts/doxygen.sh
 
-# Force sphinxcontrib-bibtex version to 0.4.2, because 1.0.0 requires
-# sphinx >= 2.0 which is only available on Python >= 3.5, and this config
-# has only 3.4
-pip3 install --user sphinxcontrib-bibtex==0.4.2
+pip3 install --user sphinxcontrib-bibtex
 pip3 install --user cpp-coveralls
 
 ./travis/docker.sh
diff --git a/travis/linux_gcc7/before_install.sh b/travis/linux_gcc7/before_install.sh
index df2bd672..a3f6c8c0 100755
--- a/travis/linux_gcc7/before_install.sh
+++ b/travis/linux_gcc7/before_install.sh
@@ -6,10 +6,8 @@ set -e
 ./travis/before_install_pip.sh
 
 sudo apt-get install -qq \
-        cppcheck \
         lcov \
         doxygen graphviz \
-        openjdk-7-jdk \
         sqlite3 libsqlite3-dev
 
 #scripts/cppcheck.sh
diff --git a/travis/mingw32/install.sh b/travis/mingw32/install.sh
index 867ca716..52e4f7a6 100755
--- a/travis/mingw32/install.sh
+++ b/travis/mingw32/install.sh
@@ -6,12 +6,13 @@ export CCACHE_CPP2=yes
 export PROJ_DB_CACHE_DIR="$HOME/.ccache"
 
 MINGW_ARCH=x86_64-w64-mingw32
-MINGW_PREFIX=/usr/lib/gcc/$MINGW_ARCH/4.8
+MINGW_PREFIX=/usr/lib/gcc/$MINGW_ARCH/5.3-posix
 
 # prepare wine environment
 WINE_SYSDIR=$HOME/.wine/drive_c/windows
 wine64 cmd /c dir
 ln -s $MINGW_PREFIX/libstdc++-6.dll $WINE_SYSDIR
+ln -s $MINGW_PREFIX/libgcc_s_seh-1.dll $WINE_SYSDIR
 ln -s $MINGW_PREFIX/libgcc_s_sjlj-1.dll $WINE_SYSDIR
 ln -s /usr/$MINGW_ARCH/lib/libwinpthread-1.dll $WINE_SYSDIR