kernel: Small fixes for Clang.

headers/private/kernel/util/kernel_cpp.h

@@ -22,7 +22,6 @@ extern const nothrow_t std::nothrow;
 typedef struct {} mynothrow_t;
 extern const mynothrow_t mynothrow;
 
-#ifndef __clang__
 #if __cplusplus >= 201402L
 #define _THROW(x)
 #define _NOEXCEPT noexcept
@@ -38,7 +37,6 @@ extern void* operator new(size_t size, const mynothrow_t &) _NOEXCEPT;
 extern void* operator new[](size_t size, const mynothrow_t &) _NOEXCEPT;
 extern void operator delete(void *ptr) _NOEXCEPT;
 extern void operator delete[](void *ptr) _NOEXCEPT;
-#endif
 
 #if __cplusplus >= 201402L
 

src/system/kernel/arch/x86/64/descriptors.cpp

@@ -117,7 +117,7 @@ public:
 										unsigned ist, bool kernelOnly);
 	constexpr						InterruptDescriptor(uintptr_t isr);
 
-	static constexpr	InterruptDescriptor	Generate(unsigned index);
+	static 		InterruptDescriptor	Generate(unsigned index);
 
 private:
 						uint16_t	fBase0;
@@ -331,7 +331,7 @@ InterruptDescriptorTable::Load() const
 }
 
 
-constexpr InterruptDescriptor
+InterruptDescriptor
 InterruptDescriptor::Generate(unsigned index)
 {
 	return index == 3

src/system/kernel/util/kernel_cpp.cpp

@@ -31,7 +31,7 @@
 
 // ... it doesn't seem to work with this symbol at least.
 #ifndef USING_LIBGCC
-#	if __GNUC__ >= 6
+#	if __GNUC__ >= 6 || defined(__clang__)
 const std::nothrow_t std::nothrow = std::nothrow_t{ };
 #	elif __GNUC__ >= 3
 const std::nothrow_t std::nothrow = {};