restore CI clang 5.0 and 6.0

.travis.yml

@@ -9,6 +9,14 @@ matrix:
       dist: trusty
       addons: { apt: { sources: ubuntu-toolchain-r-test, packages: ["xorg-dev", "g++-8"] } }
       env: MATRIX_EVAL="CC=gcc-8 && CXX=g++-8"
+    - os: linux
+      dist: trusty
+      addons: { apt: { sources: ["ubuntu-toolchain-r-test", "llvm-toolchain-trusty-5.0"], packages: ["xorg-dev", "clang-5.0", "g++-7"] } }
+      env: MATRIX_EVAL="CC=clang-5.0 && CXX=clang++-5.0"
+    - os: linux
+      dist: trusty
+      addons: { apt: { sources: ["ubuntu-toolchain-r-test", "llvm-toolchain-trusty-6.0"], packages: ["xorg-dev", "clang-6.0", "g++-7"] } }
+      env: MATRIX_EVAL="CC=clang-6.0 && CXX=clang++-6.0"
     - os: linux
       dist: trusty
       addons: { apt: { sources: ["ubuntu-toolchain-r-test", "llvm-toolchain-trusty-7"], packages: ["xorg-dev", "clang-7", "g++-7"] } }

BUILD_INSTRUCTIONS.md

@@ -5,7 +5,7 @@
 - [git](https://git-scm.com/)
 - [git-lfs](https://git-lfs.github.com/)
 - [cmake](https://cmake.org/) **>= 3.11**
-- [gcc](https://www.gnu.org/software/gcc/) **>= 7** or [clang](https://clang.llvm.org/) **>= 7** or [msvc](https://visualstudio.microsoft.com/) **>= 2017**
+- [gcc](https://www.gnu.org/software/gcc/) **>= 7** or [clang](https://clang.llvm.org/) **>= 5.0** or [msvc](https://visualstudio.microsoft.com/) **>= 2017**
 
 ## * Cloning
 

scripts/cloc_all.sh

@@ -3,6 +3,7 @@ SCRIPT_DIR=`dirname "$BASH_SOURCE"`
 cloc \
   $SCRIPT_DIR/../headers/enduro2d \
   $SCRIPT_DIR/../headers/3rdparty/ecs.hpp \
+  $SCRIPT_DIR/../headers/3rdparty/flat.hpp \
   $SCRIPT_DIR/../headers/3rdparty/promise.hpp \
   $SCRIPT_DIR/../sources/enduro2d \
   $SCRIPT_DIR/../samples/sources \

scripts/cloc_engine.sh

@@ -3,5 +3,6 @@ SCRIPT_DIR=`dirname "$BASH_SOURCE"`
 cloc \
   $SCRIPT_DIR/../headers/enduro2d \
   $SCRIPT_DIR/../headers/3rdparty/ecs.hpp \
+  $SCRIPT_DIR/../headers/3rdparty/flat.hpp \
   $SCRIPT_DIR/../headers/3rdparty/promise.hpp \
   $SCRIPT_DIR/../sources/enduro2d

scripts/cloc_headers.sh

@@ -3,4 +3,5 @@ SCRIPT_DIR=`dirname "$BASH_SOURCE"`
 cloc \
   $SCRIPT_DIR/../headers/enduro2d \
   $SCRIPT_DIR/../headers/3rdparty/ecs.hpp \
+  $SCRIPT_DIR/../headers/3rdparty/flat.hpp \
   $SCRIPT_DIR/../headers/3rdparty/promise.hpp \