Compile everything with C++14 standard

Docs/build_system.md

@@ -11,7 +11,7 @@ process.
 
 ![modules](img/modules.png)
 
-In Linux, we compile CARLA and all the dependencies with clang-5.0 and C++17
+In Linux, we compile CARLA and all the dependencies with clang-5.0 and C++14
 standard. We however link against different runtime C++ libraries depending on
 where the code going to be used, since all the code that is going to be linked
 with Unreal Engine needs to be compiled using `libc++`.

PythonAPI/setup.py

@@ -44,8 +44,8 @@ def get_libcarla_extensions():
                 'dependencies/lib'],
             runtime_library_dirs=['/usr/local/lib/boost'],
             libraries=libraries,
-            extra_compile_args=['-fPIC', '-std=c++17'],
-            language='c++17',
+            extra_compile_args=['-fPIC', '-std=c++14'],
+            language='c++14',
             depends=depends)
 
     return [make_extension('carla.libcarla', glob.glob('source/libcarla/*.cpp'))]

Util/BuildTools/Setup.sh

@@ -122,7 +122,7 @@ else
   pushd ${RPCLIB_BASENAME}-libcxx-build >/dev/null
 
   cmake -G "Ninja" \
-      -DCMAKE_CXX_FLAGS="-fPIC -std=c++17 -stdlib=libc++ -I${LLVM_INCLUDE} -Wl,-L${LLVM_LIBPATH}" \
+      -DCMAKE_CXX_FLAGS="-fPIC -std=c++14 -stdlib=libc++ -I${LLVM_INCLUDE} -Wl,-L${LLVM_LIBPATH}" \
       -DCMAKE_INSTALL_PREFIX="../${RPCLIB_BASENAME}-libcxx-install" \
       ../${RPCLIB_BASENAME}-source
 
@@ -139,7 +139,7 @@ else
   pushd ${RPCLIB_BASENAME}-libstdcxx-build >/dev/null
 
   cmake -G "Ninja" \
-      -DCMAKE_CXX_FLAGS="-fPIC -std=c++17" \
+      -DCMAKE_CXX_FLAGS="-fPIC -std=c++14" \
       -DCMAKE_INSTALL_PREFIX="../${RPCLIB_BASENAME}-libstdcxx-install" \
       ../${RPCLIB_BASENAME}-source
 
@@ -180,7 +180,7 @@ else
   pushd ${GTEST_BASENAME}-build >/dev/null
 
   cmake -G "Ninja" \
-      -DCMAKE_CXX_FLAGS="-std=c++17 -stdlib=libc++ -I${LLVM_INCLUDE} -Wl,-L${LLVM_LIBPATH}" \
+      -DCMAKE_CXX_FLAGS="-std=c++14 -stdlib=libc++ -I${LLVM_INCLUDE} -Wl,-L${LLVM_LIBPATH}" \
       -DCMAKE_INSTALL_PREFIX="../${GTEST_BASENAME}-install" \
       ../${GTEST_BASENAME}-source
 
@@ -208,7 +208,7 @@ cat >${LIBSTDCPP_TOOLCHAIN_FILE}.gen <<EOL
 set(CMAKE_C_COMPILER ${CC})
 set(CMAKE_CXX_COMPILER ${CXX})
 
-set(CMAKE_CXX_FLAGS "\${CMAKE_CXX_FLAGS} -std=c++17 -pthread -fPIC" CACHE STRING "" FORCE)
+set(CMAKE_CXX_FLAGS "\${CMAKE_CXX_FLAGS} -std=c++14 -pthread -fPIC" CACHE STRING "" FORCE)
 set(CMAKE_CXX_FLAGS "\${CMAKE_CXX_FLAGS} -Werror -Wall -Wextra" CACHE STRING "" FORCE)
 # See https://bugs.llvm.org/show_bug.cgi?id=21629
 set(CMAKE_CXX_FLAGS "\${CMAKE_CXX_FLAGS} -Wno-missing-braces" CACHE STRING "" FORCE)