Work around msvc definition of NAN

NAN is reportedly no longer a compile-time expression in some versions
of MSVC. Work around that by minting a NaN from a uint64.

Fixes: #693

Author: bnoordhuis

quickjs.c

@@ -41116,7 +41116,7 @@ static const JSCFunctionListEntry js_number_funcs[] = {
     JS_CFUNC_DEF("isSafeInteger", 1, js_number_isSafeInteger ),
     JS_PROP_DOUBLE_DEF("MAX_VALUE", 1.7976931348623157e+308, 0 ),
     JS_PROP_DOUBLE_DEF("MIN_VALUE", 5e-324, 0 ),
-    JS_PROP_DOUBLE_DEF("NaN", NAN, 0 ),
+    JS_PROP_U2D_DEF("NaN", 0x7FF8ull<<48, 0 ), // workaround for msvc
     JS_PROP_DOUBLE_DEF("NEGATIVE_INFINITY", -INFINITY, 0 ),
     JS_PROP_DOUBLE_DEF("POSITIVE_INFINITY", INFINITY, 0 ),
     JS_PROP_DOUBLE_DEF("EPSILON", 2.220446049250313e-16, 0 ), /* ES6 */
@@ -50197,7 +50197,7 @@ static const JSCFunctionListEntry js_global_funcs[] = {
     JS_CFUNC_DEF("escape", 1, js_global_escape ),
     JS_CFUNC_DEF("unescape", 1, js_global_unescape ),
     JS_PROP_DOUBLE_DEF("Infinity", 1.0 / 0.0, 0 ),
-    JS_PROP_DOUBLE_DEF("NaN", NAN, 0 ),
+    JS_PROP_U2D_DEF("NaN", 0x7FF8ull<<48, 0 ), // workaround for msvc
     JS_PROP_UNDEFINED_DEF("undefined", 0 ),
     JS_PROP_STRING_DEF("[Symbol.toStringTag]", "global", JS_PROP_CONFIGURABLE ),
 };

quickjs.h

@@ -970,6 +970,7 @@ typedef struct JSCFunctionListEntry {
         const char *str;    /* pure ASCII or UTF-8 encoded */
         int32_t i32;
         int64_t i64;
+        uint64_t u64;
         double f64;
     } u;
 } JSCFunctionListEntry;
@@ -998,6 +999,7 @@ typedef struct JSCFunctionListEntry {
 #define JS_PROP_INT32_DEF(name, val, prop_flags) { name, prop_flags, JS_DEF_PROP_INT32, 0, { .i32 = val } }
 #define JS_PROP_INT64_DEF(name, val, prop_flags) { name, prop_flags, JS_DEF_PROP_INT64, 0, { .i64 = val } }
 #define JS_PROP_DOUBLE_DEF(name, val, prop_flags) { name, prop_flags, JS_DEF_PROP_DOUBLE, 0, { .f64 = val } }
+#define JS_PROP_U2D_DEF(name, val, prop_flags) { name, prop_flags, JS_DEF_PROP_DOUBLE, 0, { .u64 = val } }
 #define JS_PROP_UNDEFINED_DEF(name, prop_flags) { name, prop_flags, JS_DEF_PROP_UNDEFINED, 0, { .i32 = 0 } }
 #define JS_OBJECT_DEF(name, tab, len, prop_flags) { name, prop_flags, JS_DEF_OBJECT, 0, { .prop_list = { tab, len } } }
 #define JS_ALIAS_DEF(name, from) { name, JS_PROP_WRITABLE | JS_PROP_CONFIGURABLE, JS_DEF_ALIAS, 0, { .alias = { from, -1 } } }