Windows: pre-basic msvc support

src/fastfetch.h

@@ -14,6 +14,10 @@
     #include "3rdparty/yyjson/yyjson.h"
 #endif
 
+#ifdef _MSC_VER
+    #define __attribute__(x)
+#endif
+
 #include "util/FFstrbuf.h"
 #include "util/FFlist.h"
 #include "util/platform/FFPlatform.h"

src/util/FFcheckmacros.h

@@ -3,8 +3,14 @@
 #ifndef FASTFETCH_INCLUDED_FFCHECKMACROS
 #define FASTFETCH_INCLUDED_FFCHECKMACROS
 
+#ifdef _MSC_VER
+    #include <sal.h>
+#endif
+
 #if defined(__GNUC__) || defined(__clang__)
     #define FF_C_NODISCARD __attribute__((warn_unused_result))
+#elif defined(_MSC_VER)
+    #define FF_C_NODISCARD _Check_return_
 #else
     #define FF_C_NODISCARD
 #endif

src/util/unused.h

@@ -5,6 +5,10 @@
 
 static inline void ffUnused(int dummy, ...) { (void) dummy; }
 #define FF_UNUSED(...) ffUnused(0, __VA_ARGS__);
-#define FF_MAYBE_UNUSED __attribute__ ((__unused__))
+#if defined(__GNUC__) || defined(__clang__)
+    #define FF_MAYBE_UNUSED __attribute__ ((__unused__))
+#else
+    #define FF_MAYBE_UNUSED
+#endif
 
 #endif