diff --git a/src/base/compiler_specific.h b/src/base/compiler_specific.h
index 78fcbaf..75f21e8 100644
--- a/src/base/compiler_specific.h
+++ b/src/base/compiler_specific.h
@@ -12,77 +12,12 @@
 // For _Printf_format_string_.
 #include <sal.h>
 
-// Macros for suppressing and disabling warnings on MSVC.
-//
-// Warning numbers are enumerated at:
-// http://msdn.microsoft.com/en-us/library/8x5x43k7(VS.80).aspx
-//
-// The warning pragma:
-// http://msdn.microsoft.com/en-us/library/2c8f766e(VS.80).aspx
-//
-// Using __pragma instead of #pragma inside macros:
-// http://msdn.microsoft.com/en-us/library/d9x1s805.aspx
-
-// MSVC_SUPPRESS_WARNING disables warning |n| for the remainder of the line and
-// for the next line of the source file.
-#define MSVC_SUPPRESS_WARNING(n) __pragma(warning(suppress : n))
-
-// MSVC_PUSH_DISABLE_WARNING pushes |n| onto a stack of warnings to be disabled.
-// The warning remains disabled until popped by MSVC_POP_WARNING.
-#define MSVC_PUSH_DISABLE_WARNING(n) \
-  __pragma(warning(push)) __pragma(warning(disable : n))
-
-// MSVC_PUSH_WARNING_LEVEL pushes |n| as the global warning level.  The level
-// remains in effect until popped by MSVC_POP_WARNING().  Use 0 to disable all
-// warnings.
-#define MSVC_PUSH_WARNING_LEVEL(n) __pragma(warning(push, n))
-
-// Pop effects of innermost MSVC_PUSH_* macro.
-#define MSVC_POP_WARNING() __pragma(warning(pop))
-
-#define MSVC_DISABLE_OPTIMIZE() __pragma(optimize("", off))
-#define MSVC_ENABLE_OPTIMIZE() __pragma(optimize("", on))
-
 #else  // Not MSVC
 
 #define _Printf_format_string_
-#define MSVC_SUPPRESS_WARNING(n)
-#define MSVC_PUSH_DISABLE_WARNING(n)
-#define MSVC_PUSH_WARNING_LEVEL(n)
-#define MSVC_POP_WARNING()
-#define MSVC_DISABLE_OPTIMIZE()
-#define MSVC_ENABLE_OPTIMIZE()
 
 #endif  // COMPILER_MSVC
 
-// Annotate a variable indicating it's ok if the variable is not used.
-// (Typically used to silence a compiler warning when the assignment
-// is important for some other reason.)
-// Use like:
-//   int x = ...;
-//   ALLOW_UNUSED_LOCAL(x);
-#define ALLOW_UNUSED_LOCAL(x) (void)x
-
-// Annotate a typedef or function indicating it's ok if it's not used.
-// Use like:
-//   typedef Foo Bar ALLOW_UNUSED_TYPE;
-#if defined(COMPILER_GCC) || defined(__clang__)
-#define ALLOW_UNUSED_TYPE __attribute__((unused))
-#else
-#define ALLOW_UNUSED_TYPE
-#endif
-
-// Annotate a function indicating it should not be inlined.
-// Use like:
-//   NOINLINE void DoStuff() { ... }
-#if defined(COMPILER_GCC)
-#define NOINLINE __attribute__((noinline))
-#elif defined(COMPILER_MSVC)
-#define NOINLINE __declspec(noinline)
-#else
-#define NOINLINE
-#endif
-
 #if COMPILER_GCC && defined(NDEBUG)
 #define ALWAYS_INLINE inline __attribute__((__always_inline__))
 #elif COMPILER_MSVC && defined(NDEBUG)
@@ -91,33 +26,6 @@
 #define ALWAYS_INLINE inline
 #endif
 
-// Specify memory alignment for structs, classes, etc.
-// Use like:
-//   class ALIGNAS(16) MyClass { ... }
-//   ALIGNAS(16) int array[4];
-//
-// In most places you can use the C++11 keyword "alignas", which is preferred.
-//
-// But compilers have trouble mixing __attribute__((...)) syntax with
-// alignas(...) syntax.
-//
-// Doesn't work in clang or gcc:
-//   struct alignas(16) __attribute__((packed)) S { char c; };
-// Works in clang but not gcc:
-//   struct __attribute__((packed)) alignas(16) S2 { char c; };
-// Works in clang and gcc:
-//   struct alignas(16) S3 { char c; } __attribute__((packed));
-//
-// There are also some attributes that must be specified *before* a class
-// definition: visibility (used for exporting functions/classes) is one of
-// these attributes. This means that it is not possible to use alignas() with a
-// class that is marked as exported.
-#if defined(COMPILER_MSVC)
-#define ALIGNAS(byte_alignment) __declspec(align(byte_alignment))
-#elif defined(COMPILER_GCC)
-#define ALIGNAS(byte_alignment) __attribute__((aligned(byte_alignment)))
-#endif
-
 // Annotate a function indicating the caller must examine the return value.
 // Use like:
 //   int foo() WARN_UNUSED_RESULT;
@@ -141,61 +49,6 @@
 #define PRINTF_FORMAT(format_param, dots_param)
 #endif
 
-// WPRINTF_FORMAT is the same, but for wide format strings.
-// This doesn't appear to yet be implemented in any compiler.
-// See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38308 .
-#define WPRINTF_FORMAT(format_param, dots_param)
-// If available, it would look like:
-//   __attribute__((format(wprintf, format_param, dots_param)))
-
-// Sanitizers annotations.
-#if defined(__has_attribute)
-#if __has_attribute(no_sanitize)
-#define NO_SANITIZE(what) __attribute__((no_sanitize(what)))
-#endif
-#endif
-#if !defined(NO_SANITIZE)
-#define NO_SANITIZE(what)
-#endif
-
-// MemorySanitizer annotations.
-#if defined(MEMORY_SANITIZER)
-#include <sanitizer/msan_interface.h>
-
-// Mark a memory region fully initialized.
-// Use this to annotate code that deliberately reads uninitialized data, for
-// example a GC scavenging root set pointers from the stack.
-#define MSAN_UNPOISON(p, size) __msan_unpoison(p, size)
-
-// Check a memory region for initializedness, as if it was being used here.
-// If any bits are uninitialized, crash with an MSan report.
-// Use this to sanitize data which MSan won't be able to track, e.g. before
-// passing data to another process via shared memory.
-#define MSAN_CHECK_MEM_IS_INITIALIZED(p, size) \
-  __msan_check_mem_is_initialized(p, size)
-#else  // MEMORY_SANITIZER
-#define MSAN_UNPOISON(p, size)
-#define MSAN_CHECK_MEM_IS_INITIALIZED(p, size)
-#endif  // MEMORY_SANITIZER
-
-// DISABLE_CFI_PERF -- Disable Control Flow Integrity for perf reasons.
-#if !defined(DISABLE_CFI_PERF)
-#if defined(__clang__) && defined(OFFICIAL_BUILD)
-#define DISABLE_CFI_PERF __attribute__((no_sanitize("cfi")))
-#else
-#define DISABLE_CFI_PERF
-#endif
-#endif
-
-// Macro useful for writing cross-platform function pointers.
-#if !defined(CDECL)
-#if defined(OS_WIN)
-#define CDECL __cdecl
-#else  // defined(OS_WIN)
-#define CDECL
-#endif  // defined(OS_WIN)
-#endif  // !defined(CDECL)
-
 // Macro for hinting that an expression is likely to be false.
 #if !defined(UNLIKELY)
 #if defined(COMPILER_GCC) || defined(__clang__)
@@ -213,14 +66,6 @@
 #endif  // defined(COMPILER_GCC)
 #endif  // !defined(LIKELY)
 
-// Compiler feature-detection.
-// clang.llvm.org/docs/LanguageExtensions.html#has-feature-and-has-extension
-#if defined(__has_feature)
-#define HAS_FEATURE(FEATURE) __has_feature(FEATURE)
-#else
-#define HAS_FEATURE(FEATURE) 0
-#endif
-
 // Macro for telling -Wimplicit-fallthrough that a fallthrough is intentional.
 #if defined(__clang__)
 #define FALLTHROUGH [[clang::fallthrough]]