Revert "Removed more compiler/linker version requirements."

This reverts commit dc64b83448.

.travis.yml

@@ -15,8 +15,8 @@ matrix:
             - ubuntu-toolchain-r-test
             - llvm-toolchain-xenial-8
           packages:
-            - g++ # we need this one for the libstdc++.
+            - g++-7 # we need this one for the libstdc++.
-            - clang
+            - clang-8
             - ninja-build
             - python
             - python-pip

Docs/build_linux.md

@@ -51,17 +51,17 @@ sudo apt-get update
 __Ubuntu 18.04__.
 
 ```sh
-sudo apt-get install build-essential clang lld g++ cmake ninja-build libvulkan1 python python-pip python-dev python3-dev python3-pip libpng-dev libtiff5-dev libjpeg-dev tzdata sed curl unzip autoconf libtool rsync libxml2-dev git
+sudo apt-get install build-essential clang-8 lld-8 g++-7 cmake ninja-build libvulkan1 python python-pip python-dev python3-dev python3-pip libpng-dev libtiff5-dev libjpeg-dev tzdata sed curl unzip autoconf libtool rsync libxml2-dev git
 ```
 __Previous Ubuntu__ versions.
 
 ```sh
-sudo apt-get install build-essential clang lld g++ cmake ninja-build libvulkan1 python python-pip python-dev python3-dev python3-pip libpng16-dev libtiff5-dev libjpeg-dev tzdata sed curl unzip autoconf libtool rsync libxml2-dev git
+sudo apt-get install build-essential clang-8 lld-8 g++-7 cmake ninja-build libvulkan1 python python-pip python-dev python3-dev python3-pip libpng16-dev libtiff5-dev libjpeg-dev tzdata sed curl unzip autoconf libtool rsync libxml2-dev git
 ```
 
 __All Ubuntu systems__.
 
-To avoid compatibility issues between Unreal Engine and the CARLA dependencies, use the same compiler version and C++ runtime library to compile everything. The CARLA team uses clang and LLVM's libc++. Change the default clang version to compile Unreal Engine and the CARLA dependencies.
+To avoid compatibility issues between Unreal Engine and the CARLA dependencies, use the same compiler version and C++ runtime library to compile everything. The CARLA team uses clang-8 and LLVM's libc++. Change the default clang version to compile Unreal Engine and the CARLA dependencies.
 
 ```sh
 sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/lib/llvm-8/bin/clang++ &&

Docs/build_system.md

@@ -15,7 +15,7 @@ The goal is to be able to call Unreal Engine's functions from a separate Python
 
 ![modules](img/build_modules.jpg)
 
-In Linux, we compile CARLA and all the dependencies with clang.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++`.
+In Linux, we compile CARLA and all the dependencies with clang-8.0 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++`.
 
 ---
 ## Setup

Docs/cont_coding_standard.md

@@ -29,7 +29,7 @@
   * Comments should not exceed 80 columns, code may exceed this limit a bit in
     rare occasions if it results in clearer code.
   * Compilation should not give any error or warning
-    (`clang++ -Wall -Wextra -std=C++14 -Wno-missing-braces`).
+    (`clang++-8 -Wall -Wextra -std=C++14 -Wno-missing-braces`).
   * The use of `throw` is forbidden, use `carla::throw_exception` instead.
   * Unreal C++ code (CarlaUE4 and Carla plugin) follow the
     [Unreal Engine's Coding Standard][ue4link] with the exception of using

Examples/CppClient/Makefile

@@ -4,8 +4,8 @@ BINDIR=$(CURDIR)/bin
 INSTALLDIR=$(CURDIR)/libcarla-install
 TOOLCHAIN=$(CURDIR)/ToolChain.cmake
 
-CC=/usr/bin/gcc
+CC=/usr/bin/gcc-7
-CXX=/usr/bin/g++
+CXX=/usr/bin/g++-7
 CXXFLAGS=-std=c++14 -pthread -fPIC -O3 -DNDEBUG -Werror -Wall -Wextra
 
 define log

Examples/CppClient/README.md

@@ -24,8 +24,8 @@ want
 
 ```cmake
 # Example ToolChain.cmake
-set(CMAKE_C_COMPILER /usr/bin/clang)
+set(CMAKE_C_COMPILER /usr/bin/clang-8)
-set(CMAKE_CXX_COMPILER /usr/bin/clang++)
+set(CMAKE_CXX_COMPILER /usr/bin/clang++-8)
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14 -O3 -DNDEBUG" CACHE STRING "" FORCE)
 ```
 

Util/Docker/Prerequisites.Dockerfile

@@ -12,9 +12,9 @@ RUN apt-get update ; \
   apt-add-repository "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-8 main" && \
   apt-get update ; \
   apt-get install -y build-essential \
-    clang \
+    clang-8 \
-    lld \
+    lld-8 \
-    g++ \
+    g++-7 \
     cmake \
     ninja-build \
     libvulkan1 \