fix to g++9

Author: gammasoft71

.travis.yml

@@ -6,14 +6,14 @@ addons:
     sources:
     - ubuntu-toolchain-r-test
     packages:
-    - g++-8
+    - g++-9
     - lcov
 
 matrix:
   include:
   - env: TEST="Build on macOS"
     os: osx
-    osx_image: xcode10.1
+    osx_image: xcode11.6
     script: scripts/travis/build_macos.sh
   - env: TEST="Build on Linux"
     os: linux

scripts/travis/build_linux.sh

@@ -4,14 +4,14 @@ mkdir -p build/examples
 cd build
 
 # generate and build lib
-cmake -DCMAKE_BUILD_TYPE=Debug -DENABLE_TESTS=ON -DCMAKE_CXX_COMPILER=g++-8 -DCMAKE_INSTALL_PREFIX=~/local ..
+cmake -DCMAKE_BUILD_TYPE=Debug -DENABLE_TESTS=ON -DCMAKE_CXX_COMPILER=g++-9 -DCMAKE_INSTALL_PREFIX=~/local ..
 if [ $? -ne 0 ]; then exit -1; fi
 cmake --build . --target install -- -j $(nproc)
 if [ $? -ne 0 ]; then exit -1; fi
 
 # generate and build examples
 cd examples
-cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_CXX_COMPILER=g++-8 -DCMAKE_INSTALL_PREFIX=~/local ../../examples
+cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_CXX_COMPILER=g++-9 -DCMAKE_INSTALL_PREFIX=~/local ../../examples
 if [ $? -ne 0 ]; then exit -1; fi
 cmake --build . -- -j $(nproc)
 if [ $? -ne 0 ]; then exit -1; fi

scripts/travis/coverage.sh

@@ -4,7 +4,7 @@ mkdir -p build
 cd build
 
 # generate and build lib with coverage
-cmake -DCMAKE_BUILD_TYPE=Debug -DENABLE_TESTS=ON -DCMAKE_CXX_COMPILER=g++-8 -DENABLE_COVERAGE=ON ..
+cmake -DCMAKE_BUILD_TYPE=Debug -DENABLE_TESTS=ON -DCMAKE_CXX_COMPILER=g++-9 -DENABLE_COVERAGE=ON ..
 if [ $? -ne 0 ]; then exit -1; fi
 cmake --build . -- -j $(nproc)
 if [ $? -ne 0 ]; then exit -1; fi