Problem: no CMake Travis CI build

Solution: add builds/cmake/ci_build.sh and call it from travis.yml

.travis.yml

@@ -10,9 +10,17 @@ env:
 - BUILD_TYPE=default
 - BUILD_TYPE=android
 - BUILD_TYPE=tweetnacl
+- BUILD_TYPE=cmake
 
 sudo: false
 
+addons:
+  apt:
+    sources:
+    - kubuntu-backports
+    packages:
+    - cmake
+
 before_install:
 - if [ $TRAVIS_OS_NAME == "osx" ] ; then brew update; brew install binutils ; fi
 

builds/cmake/ci_build.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+set -x
+
+mkdir tmp
+BUILD_PREFIX=$PWD/tmp
+
+CONFIG_OPTS=()
+CONFIG_OPTS+=("CFLAGS=-I${BUILD_PREFIX}/include")
+CONFIG_OPTS+=("CPPFLAGS=-I${BUILD_PREFIX}/include")
+CONFIG_OPTS+=("CXXFLAGS=-I${BUILD_PREFIX}/include")
+CONFIG_OPTS+=("LDFLAGS=-L${BUILD_PREFIX}/lib")
+CONFIG_OPTS+=("PKG_CONFIG_PATH=${BUILD_PREFIX}/lib/pkgconfig")
+
+CMAKE_OPTS=()
+CMAKE_OPTS+=("-DCMAKE_INSTALL_PREFIX:PATH=${BUILD_PREFIX}")
+CMAKE_OPTS+=("-DCMAKE_PREFIX_PATH:PATH=${BUILD_PREFIX}")
+CMAKE_OPTS+=("-DCMAKE_LIBRARY_PATH:PATH=${BUILD_PREFIX}/lib")
+CMAKE_OPTS+=("-DCMAKE_INCLUDE_PATH:PATH=${BUILD_PREFIX}/include")
+
+git clone --depth 1 -b stable git://github.com/jedisct1/libsodium.git &&
+( cd libsodium; ./autogen.sh && ./configure --prefix=$BUILD_PREFIX && make && make install ) || exit 1
+
+# Build, check, and install from local source
+( cd ../..; mkdir build_cmake && cd build_cmake && PKG_CONFIG_PATH=${BUILD_PREFIX}/lib/pkgconfig cmake "${CMAKE_OPTS[@]}" .. && make all VERBOSE=1 && make install ) || exit 1