Do not pretend that windows is supported (remove code undef #ifdef _MSC_VER)

base/base/defines.h

@@ -15,33 +15,18 @@
 #    define ch_has_feature __has_feature
 #endif
 
-#if defined(_MSC_VER)
-#   if !defined(likely)
-#      define likely(x)   (x)
-#   endif
-#   if !defined(unlikely)
-#      define unlikely(x) (x)
-#   endif
-#else
-#   if !defined(likely)
-#       define likely(x)   (__builtin_expect(!!(x), 1))
-#   endif
-#   if !defined(unlikely)
-#       define unlikely(x) (__builtin_expect(!!(x), 0))
-#   endif
+#if !defined(likely)
+#    define likely(x)   (__builtin_expect(!!(x), 1))
+#endif
+#if !defined(unlikely)
+#    define unlikely(x) (__builtin_expect(!!(x), 0))
 #endif
 
 // more aliases: https://mailman.videolan.org/pipermail/x264-devel/2014-May/010660.html
 
-#if defined(_MSC_VER)
-#    define ALWAYS_INLINE __forceinline
-#    define NO_INLINE static __declspec(noinline)
-#    define MAY_ALIAS
-#else
-#    define ALWAYS_INLINE __attribute__((__always_inline__))
-#    define NO_INLINE __attribute__((__noinline__))
-#    define MAY_ALIAS __attribute__((__may_alias__))
-#endif
+#define ALWAYS_INLINE __attribute__((__always_inline__))
+#define NO_INLINE __attribute__((__noinline__))
+#define MAY_ALIAS __attribute__((__may_alias__))
 
 #if !defined(__x86_64__) && !defined(__aarch64__) && !defined(__PPC__)
 #    error "The only supported platforms are x86_64 and AArch64, PowerPC (work in progress)"

base/base/demangle.cpp

@@ -1,20 +1,5 @@
 #include <base/demangle.h>
 
-#if defined(_MSC_VER)
-
-DemangleResult tryDemangle(const char *)
-{
-    return DemangleResult{};
-}
-
-std::string demangle(const char * name, int & status)
-{
-    status = 0;
-    return name;
-}
-
-#else
-
 #include <stdlib.h>
 #include <cxxabi.h>
 
@@ -39,6 +24,3 @@ std::string demangle(const char * name, int & status)
 
     return name;
 }
-
-
-#endif

base/base/mremap.cpp

@@ -19,22 +19,14 @@ void * mremap_fallback(
         return MAP_FAILED;
     }
 
-#if defined(_MSC_VER)
-    void * new_address = ::operator new(new_size);
-#else
     void * new_address = mmap(nullptr, new_size, mmap_prot, mmap_flags, mmap_fd, mmap_offset);
     if (MAP_FAILED == new_address)
         return MAP_FAILED;
-#endif
 
     memcpy(new_address, old_address, old_size);
 
-#if defined(_MSC_VER)
-    delete old_address;
-#else
     if (munmap(old_address, old_size))
         abort();
-#endif
 
     return new_address;
 }

base/base/mremap.h

@@ -2,9 +2,7 @@
 
 #include <cstddef>
 #include <sys/types.h>
-#if !defined(_MSC_VER)
 #include <sys/mman.h>
-#endif
 
 
 #ifdef MREMAP_MAYMOVE