Visual Studio: silence warning about macro re-definition and conversion in lexer

Flex generates definitions before system headers are included, and tokens result
in signed/unsigned comparison.

Author: tautschnig

src/ansi-c/scanner.l

@@ -4,6 +4,14 @@
 
 %{
 
+#if defined _MSC_VER
+// signed/unsigned mismatch
+#pragma warning(disable:4365)
+// macro re-definition: flex conditonally defines INT32_MAX et al. and thus
+// they are set before library headers get to define them
+#pragma warning(disable:4005)
+#endif
+
 /*
  * This scanner is based on:
  *

src/assembler/scanner.l

@@ -5,6 +5,14 @@
 
 %{
 
+#if defined _MSC_VER
+// signed/unsigned mismatch
+#pragma warning(disable:4365)
+// macro re-definition: flex conditonally defines INT32_MAX et al. and thus
+// they are set before library headers get to define them
+#pragma warning(disable:4005)
+#endif
+
 #define PARSER assembler_parser
 #define YYSTYPE unsigned
 #undef  ECHO

src/jsil/scanner.l

@@ -6,6 +6,14 @@
 
 %{
 
+#if defined _MSC_VER
+// signed/unsigned mismatch
+#pragma warning(disable:4365)
+// macro re-definition: flex conditonally defines INT32_MAX et al. and thus
+// they are set before library headers get to define them
+#pragma warning(disable:4005)
+#endif
+
 #include <util/expr.h>
 
 #include <ansi-c/literals/convert_float_literal.h>

src/json/scanner.l

@@ -12,6 +12,14 @@
 
 %{
 
+#if defined _MSC_VER
+// signed/unsigned mismatch
+#pragma warning(disable:4365)
+// macro re-definition: flex conditonally defines INT32_MAX et al. and thus
+// they are set before library headers get to define them
+#pragma warning(disable:4005)
+#endif
+
 #define PARSER json_parser
 
 #include "json_parser.h"

src/xmllang/scanner.l

@@ -6,6 +6,14 @@
 
 %{
 
+#if defined _MSC_VER
+// signed/unsigned mismatch
+#pragma warning(disable:4365)
+// macro re-definition: flex conditonally defines INT32_MAX et al. and thus
+// they are set before library headers get to define them
+#pragma warning(disable:4005)
+#endif
+
 #include <cctype>
 #include <cstring>
 #include <cstdlib>