Try to restore travis build.

.gitignore

@@ -1,6 +1,7 @@
 bench
 vpack-to-json
 json-to-vpack
+taocpp-json
 core 
 AsmTest
 *.o

.travis.yml

@@ -46,6 +46,7 @@ matrix:
         - build_type=Release
         - SANITIZER=false
         - CXX_STANDARD=17
+        - TAO=ON
       addons:
         apt:
           packages: ['gcc-8', 'g++-8', 'cmake']
@@ -92,6 +93,7 @@ matrix:
         #build settings
         - build_type=Release
         - CXX_STANDARD=17
+        - TAO=ON
       addons:
         apt:
           sources:
@@ -105,12 +107,16 @@ matrix:
       compiler: clang
       env:
         - build_type=Release
+        - TAO=ON
 
 install:
+    - git clone https://github.com/taocpp/json.git taocpp-json
+    - ( cd taocpp-json; git checkout 631095f4bfa45c63af5ccc1cb35ea16eb9ead450; )
     - export CXX=$CXX
     - export CC=$CC
     - export CXX_STANDARD=${CXX_STANDARD:-17}
     - export BUILD_TYPE=${build_type}
+    - export TAO=${TAO:-OFF}
     - cmake --version
     - $CXX --version
 

CMakeLists.txt

@@ -11,6 +11,15 @@ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Mo
 
 option(BuildVelocyPackExamples "Build examples" ON)
 option(Maintainer "Build maintainer tools" OFF)
+option(TaoJson "Add support for taocpp::json" OFF)
+
+if(TaoJson)
+    if(NOT TARGET taocpp::json)
+        set(TAOCPP_JSON_BUILD_TESTS OFF CACHE BOOL "Build test programs" FORCE)
+        set(TAOCPP_JSON_BUILD_EXAMPLES OFF CACHE BOOL "Build example programs" FORCE)
+        add_subdirectory(taocpp-json EXCLUDE_FROM_ALL)
+    endif()
+endif()
 
 set(HashType "xxhash" CACHE STRING "Hash type (fasthash, xxhash)" )
 
@@ -44,7 +53,7 @@ set(VELOCY_SOURCE
     src/Iterator.cpp
     src/Options.cpp
     src/Parser.cpp
-    src/TaoParser.cpp
+    $<$<BOOL:${TaoJson}>:src/TaoParser.cpp>
     src/Serializable.cpp
     src/Slice.cpp
     src/SliceStaticData.cpp
@@ -80,6 +89,7 @@ message(STATUS "Building with hash type: ${HashType}")
 add_library(velocypack STATIC ${VELOCY_SOURCE})
 target_include_directories(velocypack PRIVATE src)
 target_include_directories(velocypack PUBLIC include)
+target_link_libraries(velocypack PUBLIC $<$<BOOL:${TaoJson}>:taocpp::json>)
 
 if(Maintainer)
     add_executable(buildVersion scripts/build-version.cpp)

scripts/travis-build.sh

@@ -16,12 +16,13 @@ if [[ $TRAVIS_OS_NAME == "linux" ]]; then
 fi
 
 echo "Building with C++ Standard $CXX_STANDARD"
+echo "TaoJson support: $TAO"
 
 mkdir -p build && cd build || ferr "could not create build dir"
 
 cmake -DCMAKE_BUILD_TYPE=Release -DHashType=xxhash \
       -DBuildTests=ON -DBuildLargeTests=OFF -DBuildVelocyPackExamples=ON \
-      -DBuildTools=ON -DEnableSSE=OFF \
+      -DBuildTools=ON -DEnableSSE=OFF -DTaoJson="$TAO" \
       -DCMAKE_CXX_STANDARD=${CXX_STANDARD} \
       .. || ferr "failed to configure"