vidjil.cpp: warns when clang or gcc is too old

Closes #2631.

algo/core/check-compiler.h

+
+
+// Check compiler
+
+#if defined(__clang__)
+    #if (__clang_major__ * 10000 + __clang_minor__ * 100 + __clang_patchlevel__) < 30300
+        #warning "Vidjil needs a C++11 compiler such as clang >= 3.3 - see http://vidjil.org/doc/algo.html"
+    #endif
+#elif defined(__GNUC__)
+    #if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) < 40800
+        #warning "Vidjil needs a C++11 compiler such as gcc >= 4.8 - see http://vidjil.org/doc/algo.html"
+    #endif
+#endif

algo/vidjil.cpp

@@ -35,6 +35,7 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+#include "core/check-compiler.h"
 #include "core/tools.h"
 #include "core/json.h"
 #include "core/germline.h"