struggling against Travis CI

CMakeLists.txt

@@ -36,12 +36,18 @@ message("*")
 # Compile stuff
 #
 
+set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,--no-undefined")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pedantic -Wall -Wconversion")
 set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -DRELEASE")
 set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -O0 -g -DDEBUG")
 
 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+    # When using clang and libc++ on Travis CI, CMAKE_CXX_STANDARD and
+    # CMAKE_CXX_STANDARD_REQUIRED are ignored for unknown reasons, so... back to
+    # the dear, old way to do that and everything is up and running again.
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14")
     # it seems that -O3 ruins the performance when using clang ...
     set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O2")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
@@ -50,9 +56,6 @@ else()
     set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3")
 endif()
 
-set(CMAKE_CXX_STANDARD_REQUIRED ON)
-set(CMAKE_CXX_STANDARD 14)
-
 #
 # CMake configuration
 #