[chore] Use gnu-efi as a part of project

efi/inc/eficompiler.h

@@ -0,0 +1,77 @@
+#ifndef _EFICOMPILER_H_
+#define _EFICOMPILER_H_
+
+/*++
+
+Copyright (c) 2016-2024 Pete Batard <pete@akeo.ie>
+
+Module Name:
+
+    eficompiler.h
+
+Abstract:
+
+    Compiler specific adjustments
+
+--*/
+
+#if defined(__GNUC__)
+#define EFI_UNUSED __attribute__((__unused__))
+#else
+#define EFI_UNUSED
+#endif
+
+#if defined(__clang__)
+#define EFI_NO_TAIL_CALL __attribute__((disable_tail_calls))
+#elif defined(__GNUC__)
+#define EFI_NO_TAIL_CALL __attribute__((optimize("no-optimize-sibling-calls")))
+#else
+#define EFI_NO_TAIL_CALL
+#endif
+
+#if defined(__clang__)
+#define EFI_OPTNONE __attribute__((optnone))
+#elif defined(__GNUC__)
+#define EFI_OPTNONE __attribute__((__optimize__("0")))
+#else
+#define EFI_OPTNONE
+#endif
+
+#if defined(__GNUC__)
+#define EFI_ALIGN(x) __attribute__((__aligned__(x)))
+#elif defined(_MSC_VER)
+#define EFI_ALIGN(x) __declspec(align(x))
+#else
+// Not being able to align is likely to break executables, so report it
+#error "No alignement directive is defined for this platform"
+#endif
+
+#if !defined(ALIGN)
+#define ALIGN(x) EFI_ALIGN(x)
+#endif
+
+#if defined(__GNUC__)
+#define EFI_NORETURN __attribute__((noreturn))
+#elif defined(_MSC_VER)
+#define EFI_NORETURN __declspec(noreturn)
+#else
+#define EFI_NORETURN
+#endif
+
+#if defined(__GNUC__)
+#define EFI_NOINLINE __attribute__((noinline))
+#elif defined(_MSC_VER)
+#define EFI_NOINLINE __declspec(noinline)
+#else
+#define EFI_NOINLINE
+#endif
+
+#define EFI_INLINE inline
+#define EFI_INTERNAL STATIC EFI_INLINE
+
+/* Also add a catch-all on __attribute__() for MS compilers */
+#if defined(_MSC_VER)
+#define __attribute__(x)
+#endif
+
+#endif /* _EFICOMPILER_H_ */