在编译自定义的makefile时，会发现脱离autogen生成脚本时，引用头文件会进行一次编译器参数定义下的自动typedefine的判断。这个判断依赖于编译器命令的传入参数，所以这里结合实际的autogen生成GNUmakefile来做一次具体的解析。
原始的问题可以表示为这样的图：
造成这个现象的原因是MdePkg中引用了一些Base.h的文件，里面会根据当前的一些环境参数进行各不相同的变量的实例化。
具体的报错位置为：
这个宏展开是从ProcessorBind.h进行的，正是由于引用了错误的ProcessorBind.h，所以导致了这个报错。
在进行头文件引用时，会依次传入两个-I参数，如下：
-I /edk2/MdePkg/Include/
-I /edk2/MdePkg/Include/x64/
其中因为第二个-I中错误的指向了x64，导致Base.h文件进行ProcessorBind.h的导入时导了错误的头文件，如下：
所以，将-I指向指定为AArch64来规避：
-I /edk2/MdePkg/Include/
-I /edk2/MdePkg/Include/AArch64/
规避后错误消失：
下面的是一些额外的参考资料。
参考的gcc指令展开
原autogen下makefile指令的展开为：
"/usr/bin/aarch64-linux-gnu-gcc"
-MMD
-MF
/edk2/Build/Shell/RELEASE_GCC5/AARCH64/ShellPkg/Application/Shell/Shell/OUTPUT/Shell.obj.deps
-g
-Os
-fshort-wchar
-fno-builtin
-fno-strict-aliasing
-Wall
-Werror
-Wno-array-bounds
-include
AutoGen.h
-fno-common
-ffunction-sections
-fdata-sections
-DSTRING_ARRAY_NAME=ShellStrings
-g
-Os
-fshort-wchar
-fno-builtin
-fno-strict-aliasing
-Wall
-Werror
-Wno-array-bounds
-include
AutoGen.h
-fno-common
-mlittle-endian
-fno-short-enums
-fverbose-asm
-funsigned-char
-ffunction-sections
-fdata-sections
-Wno-address
-fno-asynchronous-unwind-tables
-fno-unwind-tables
-fno-pic
-fno-pie
-ffixed-x18
-mcmodel=small
-flto
-Wno-unused-but-set-variable
-Wno-unused-const-variable
-D
DISABLE_NEW_DEPRECATED_INTERFACES
-c
-o
/edk2/Build/Shell/RELEASE_GCC5/AARCH64/ShellPkg/Application/Shell/Shell/OUTPUT/./Shell.obj
-I/edk2/ShellPkg/Application/Shell
-I/edk2/Build/Shell/RELEASE_GCC5/AARCH64/ShellPkg/Application/Shell/Shell/DEBUG
-I/edk2/MdePkg
-I/edk2/MdePkg/Include
-I/edk2/MdePkg/Test/UnitTest/Include
-I/edk2/MdePkg/Include/AArch64
-I/edk2/ShellPkg
-I/edk2/ShellPkg/Include
-I/edk2/MdeModulePkg
-I/edk2/MdeModulePkg/Include
/edk2/ShellPkg/Application/Shell/Shell.c参考的aarch-linux-gnu-gcc的宏展开
使用aarch64-linux-gnu-gcc -dM -E - < /dev/null命令，可以查看aarch64-linux-gnu-gcc自带的宏：
#define __SSP_STRONG__ 3
#define __DBL_MIN_EXP__ (-1021)
#define __LDBL_MANT_DIG__ 113
#define __UINT_LEAST16_MAX__ 0xffff
#define __ARM_SIZEOF_WCHAR_T 4
#define __DBL_DECIMAL_DIG__ 17
#define __ATOMIC_ACQUIRE 2
#define __FLT128_MAX_10_EXP__ 4932
#define __FLT_MIN__ 1.17549435082228750796873653722224568e-38F
#define __GCC_IEC_559_COMPLEX 2
#define __UINT_LEAST8_TYPE__ unsigned char
#define __FLT128_DIG__ 33
#define __INTMAX_C(c) c ## L
#define __CHAR_BIT__ 8
#define __UINT8_MAX__ 0xff
#define __WCHAR_MAX__ 0xffffffffU
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 1
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 1
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8 1
#define __GCC_ATOMIC_CHAR_LOCK_FREE 2
#define __GCC_IEC_559 2
#define __FLT32X_DECIMAL_DIG__ 17
#define __FLT_EVAL_METHOD__ 0
#define __FLT64_DECIMAL_DIG__ 17
#define __GCC_ATOMIC_CHAR32_T_LOCK_FREE 2
#define __UINT_FAST32_TYPE__ long unsigned int
#define __UINT_FAST64_MAX__ 0xffffffffffffffffUL
#define __SIG_ATOMIC_TYPE__ int
#define __DBL_MIN_10_EXP__ (-307)
#define __FINITE_MATH_ONLY__ 0
#define __FLT32X_MAX_EXP__ 1024
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 1
#define __GNUC_PATCHLEVEL__ 0
#define __FLT32_HAS_DENORM__ 1
#define __UINT_FAST8_MAX__ 0xff
#define __INT8_C(c) c
#define __INT_LEAST8_WIDTH__ 8
#define __INTMAX_TYPE__ long int
#define __UINT_LEAST64_MAX__ 0xffffffffffffffffUL
#define __SHRT_MAX__ 0x7fff
#define __STDC_ISO_10646__ 201706L
#define __LDBL_MAX__ 1.18973149535723176508575932662800702e+4932L
#define __ARM_FEATURE_IDIV 1
#define __FLT64X_MAX_10_EXP__ 4932
#define __LDBL_IS_IEC_60559__ 2
#define __ARM_FP 14
#define __FLT64X_IS_IEC_60559__ 2
#define __FLT64X_HAS_QUIET_NAN__ 1
#define __WINT_TYPE__ unsigned int
#define __UINT_LEAST8_MAX__ 0xff
#define __FLT128_DENORM_MIN__ 6.47517511943802511092443895822764655e-4966F128
#define __UINTMAX_TYPE__ long unsigned int
#define _STDC_PREDEF_H 1
#define __linux 1
#define __FLT_EVAL_METHOD_TS_18661_3__ 0
#define __CHAR_UNSIGNED__ 1
#define __UINT32_MAX__ 0xffffffffU
#define __DBL_DENORM_MIN__ ((double)4.94065645841246544176568792868221372e-324L)
#define __AARCH64_CMODEL_SMALL__ 1
#define __LDBL_MAX_EXP__ 16384
#define __INT_FAST32_WIDTH__ 64
#define __FLT128_MIN_EXP__ (-16381)
#define __FLT128_MIN_10_EXP__ (-4931)
#define __FLT32X_IS_IEC_60559__ 2
#define __INT_LEAST16_WIDTH__ 16
#define __SCHAR_MAX__ 0x7f
#define __FLT128_MANT_DIG__ 113
#define __DBL_MAX__ ((double)1.79769313486231570814527423731704357e+308L)
#define __WCHAR_MIN__ 0U
#define __INT64_C(c) c ## L
#define __GCC_ATOMIC_POINTER_LOCK_FREE 2
#define __SIZEOF_INT__ 4
#define __INT_FAST64_WIDTH__ 64
#define __PRAGMA_REDEFINE_EXTNAME 1
#define __FLT32X_MANT_DIG__ 53
#define __USER_LABEL_PREFIX__
#define __FLT32_MAX_10_EXP__ 38
#define __FLT64X_EPSILON__ 1.92592994438723585305597794258492732e-34F64x
#define __STDC_HOSTED__ 1
#define __DBL_DIG__ 15
#define __FLT32_DIG__ 6
#define __FLT_EPSILON__ 1.19209289550781250000000000000000000e-7F
#define __SHRT_WIDTH__ 16
#define __FLT32_IS_IEC_60559__ 2
#define __LDBL_MIN__ 3.36210314311209350626267781732175260e-4932L
#define __STDC_UTF_16__ 1
#define __FLT16_HAS_QUIET_NAN__ 1
#define __ARM_SIZEOF_MINIMAL_ENUM 4
#define __FLT64X_DENORM_MIN__ 6.47517511943802511092443895822764655e-4966F64x
#define __FP_FAST_FMA 1
#define __FLT32X_HAS_INFINITY__ 1
#define __INT32_MAX__ 0x7fffffff
#define __FLT16_DIG__ 3
#define __INT_WIDTH__ 32
#define __SIZEOF_LONG__ 8
#define __STDC_IEC_559__ 1
#define __UINT16_C(c) c
#define __DECIMAL_DIG__ 36
#define __STDC_IEC_559_COMPLEX__ 1
#define __FLT64_EPSILON__ 2.22044604925031308084726333618164062e-16F64
#define __gnu_linux__ 1
#define __INT16_MAX__ 0x7fff
#define __FLT128_IS_IEC_60559__ 2
#define __FLT64X_MIN_10_EXP__ (-4931)
#define __LDBL_HAS_QUIET_NAN__ 1
#define __FLT16_MIN_EXP__ (-13)
#define __FLT64_MANT_DIG__ 53
#define __FLT64X_MANT_DIG__ 113
#define __GNUC__ 11
#define __pie__ 2
#define __FLT_HAS_DENORM__ 1
#define __SIZEOF_LONG_DOUBLE__ 16
#define __LDBL_MIN_EXP__ (-16381)
#define __FLT64_MAX_10_EXP__ 308
#define __FLT16_MAX_10_EXP__ 4
#define __DBL_IS_IEC_60559__ 2
#define __INT_FAST32_MAX__ 0x7fffffffffffffffL
#define __DBL_HAS_INFINITY__ 1
#define __HAVE_SPECULATION_SAFE_VALUE 1
#define __INTPTR_WIDTH__ 64
#define __FLT32X_HAS_DENORM__ 1
#define __INT_FAST16_TYPE__ long int
#define __LDBL_HAS_DENORM__ 1
#define __FLT128_HAS_INFINITY__ 1
#define __FLT32_DECIMAL_DIG__ 9
#define __DBL_MAX_EXP__ 1024
#define __WCHAR_WIDTH__ 32
#define __FLT32_MAX__ 3.40282346638528859811704183484516925e+38F32
#define __GCC_ATOMIC_LONG_LOCK_FREE 2
#define __FLT16_DECIMAL_DIG__ 5
#define __FLT_IS_IEC_60559__ 2
#define __FLT32_HAS_QUIET_NAN__ 1
#define __LONG_LONG_MAX__ 0x7fffffffffffffffLL
#define __SIZEOF_SIZE_T__ 8
#define __SIG_ATOMIC_WIDTH__ 32
#define __ARM_ALIGN_MAX_PWR 28
#define __SIZEOF_WINT_T__ 4
#define __LONG_LONG_WIDTH__ 64
#define __FLT32_MAX_EXP__ 128
#define __ARM_FP16_FORMAT_IEEE 1
#define __FLT_MIN_EXP__ (-125)
#define __FLT64_NORM_MAX__ 1.79769313486231570814527423731704357e+308F64
#define __PIE__ 2
#define __GCC_HAVE_DWARF2_CFI_ASM 1
#define __FLT32X_MIN_EXP__ (-1021)
#define __INT_FAST64_TYPE__ long int
#define __ARM_FP16_ARGS 1
#define __FP_FAST_FMAF 1
#define __FLT128_NORM_MAX__ 1.18973149535723176508575932662800702e+4932F128
#define __FLT64_DENORM_MIN__ 4.94065645841246544176568792868221372e-324F64
#define __DBL_MIN__ ((double)2.22507385850720138309023271733240406e-308L)
#define __ARM_FEATURE_CLZ 1
#define __FLT16_DENORM_MIN__ 5.96046447753906250000000000000000000e-8F16
#define __unix__ 1
#define __FLT64X_NORM_MAX__ 1.18973149535723176508575932662800702e+4932F64x
#define __SIZEOF_POINTER__ 8
#define __LP64__ 1
#define __DBL_HAS_QUIET_NAN__ 1
#define __FLT_EVAL_METHOD_C99__ 0
#define __FLT32X_EPSILON__ 2.22044604925031308084726333618164062e-16F32x
#define __FLT64_MIN_EXP__ (-1021)
#define __UINT64_MAX__ 0xffffffffffffffffUL
#define __LDBL_DECIMAL_DIG__ 36
#define __FLT_MAX__ 3.40282346638528859811704183484516925e+38F
#define __aarch64__ 1
#define __FLT64_MIN_10_EXP__ (-307)
#define __FLT64X_DECIMAL_DIG__ 36
#define __REGISTER_PREFIX__
#define __UINT16_MAX__ 0xffff
#define __INTMAX_WIDTH__ 64
#define __LDBL_HAS_INFINITY__ 1
#define __FLT_DIG__ 6
#define __NO_INLINE__ 1
#define __DEC_EVAL_METHOD__ 2
#define __FLT_MANT_DIG__ 24
#define __FLT16_MIN_10_EXP__ (-4)
#define __VERSION__ "11.4.0"
#define __UINT64_C(c) c ## UL
#define __GXX_ABI_VERSION 1016
#define __WINT_MAX__ 0xffffffffU
#define __INT_LEAST32_MAX__ 0x7fffffff
#define __GCC_ATOMIC_INT_LOCK_FREE 2
#define __FLT32X_MIN__ 2.22507385850720138309023271733240406e-308F32x
#define __FLT128_MAX_EXP__ 16384
#define __FLT32_MANT_DIG__ 24
#define __AARCH64EL__ 1
#define __FLOAT_WORD_ORDER__ __ORDER_LITTLE_ENDIAN__
#define __FLT16_MAX_EXP__ 16
#define __BIGGEST_ALIGNMENT__ 16
#define __STDC_IEC_60559_COMPLEX__ 201404L
#define __INT32_C(c) c
#define __FLT128_HAS_DENORM__ 1
#define __SCHAR_WIDTH__ 8
#define __ORDER_PDP_ENDIAN__ 3412
#define __ARM_64BIT_STATE 1
#define __INT_FAST32_TYPE__ long int
#define __UINT_LEAST16_TYPE__ short unsigned int
#define __SIZE_TYPE__ long unsigned int
#define __GNUC_WIDE_EXECUTION_CHARSET_NAME "UTF-32LE"
#define __FLT64X_DIG__ 33
#define __ARM_FEATURE_FMA 1
#define __INT8_TYPE__ signed char
#define __ELF__ 1
#define __GCC_ASM_FLAG_OUTPUTS__ 1
#define __GCC_ATOMIC_TEST_AND_SET_TRUEVAL 1
#define __FLT_RADIX__ 2
#define __INT_LEAST16_TYPE__ short int
#define __ARM_ARCH_PROFILE 65
#define __LDBL_EPSILON__ 1.92592994438723585305597794258492732e-34L
#define __UINTMAX_C(c) c ## UL
#define __ARM_PCS_AAPCS64 1
#define __SIG_ATOMIC_MAX__ 0x7fffffff
#define __INT_LEAST64_WIDTH__ 64
#define __GCC_ATOMIC_WCHAR_T_LOCK_FREE 2
#define __STDC_IEC_60559_BFP__ 201404L
#define __SIZEOF_PTRDIFF_T__ 8
#define __ATOMIC_RELAXED 0
#define __LDBL_DIG__ 33
#define __FLT64_IS_IEC_60559__ 2
#define __FLT16_IS_IEC_60559__ 2
#define __INT_FAST16_MAX__ 0x7fffffffffffffffL
#define __FLT64_DIG__ 15
#define __UINT_FAST32_MAX__ 0xffffffffffffffffUL
#define __UINT_LEAST64_TYPE__ long unsigned int
#define __FLT16_EPSILON__ 9.76562500000000000000000000000000000e-4F16
#define __FLT_HAS_QUIET_NAN__ 1
#define __FLT_MAX_10_EXP__ 38
#define __LONG_MAX__ 0x7fffffffffffffffL
#define __FLT64X_HAS_DENORM__ 1
#define __FLT_HAS_INFINITY__ 1
#define __GNUC_EXECUTION_CHARSET_NAME "UTF-8"
#define __unix 1
#define __DBL_HAS_DENORM__ 1
#define __UINT_FAST16_TYPE__ long unsigned int
#define __FLT32X_HAS_QUIET_NAN__ 1
#define __CHAR16_TYPE__ short unsigned int
#define __FLT64X_MAX_EXP__ 16384
#define __SIZE_WIDTH__ 64
#define __INT_LEAST16_MAX__ 0x7fff
#define __FLT16_NORM_MAX__ 6.55040000000000000000000000000000000e+4F16
#define __INT64_MAX__ 0x7fffffffffffffffL
#define __FLT32_DENORM_MIN__ 1.40129846432481707092372958328991613e-45F32
#define __INT_LEAST64_TYPE__ long int
#define __INT16_TYPE__ short int
#define __INT_LEAST8_TYPE__ signed char
#define __FLT16_MAX__ 6.55040000000000000000000000000000000e+4F16
#define __STDC_VERSION__ 201710L
#define __INT_FAST8_MAX__ 0x7f
#define __ARM_ARCH 8
#define __FLT128_MAX__ 1.18973149535723176508575932662800702e+4932F128
#define __INTPTR_MAX__ 0x7fffffffffffffffL
#define linux 1
#define __ARM_FEATURE_UNALIGNED 1
#define __FLT64_HAS_QUIET_NAN__ 1
#define __FLT64X_MIN_EXP__ (-16381)
#define __FLT32_MIN_10_EXP__ (-37)
#define __FLT32X_DIG__ 15
#define __UINT8_TYPE__ unsigned char
#define __PTRDIFF_WIDTH__ 64
#define __FLT64_HAS_INFINITY__ 1
#define __FLT64X_MAX__ 1.18973149535723176508575932662800702e+4932F64x
#define __FLT16_HAS_INFINITY__ 1
#define __SIG_ATOMIC_MIN__ (-__SIG_ATOMIC_MAX__ - 1)
#define __PTRDIFF_MAX__ 0x7fffffffffffffffL
#define __FLT16_MANT_DIG__ 11
#define __INTPTR_TYPE__ long int
#define __UINT16_TYPE__ short unsigned int
#define __WCHAR_TYPE__ unsigned int
#define __pic__ 2
#define __UINTPTR_MAX__ 0xffffffffffffffffUL
#define __ARM_ARCH_8A 1
#define __INT_FAST64_MAX__ 0x7fffffffffffffffL
#define __FLT_NORM_MAX__ 3.40282346638528859811704183484516925e+38F
#define __FLT32_HAS_INFINITY__ 1
#define __UINT_FAST64_TYPE__ long unsigned int
#define __INT_MAX__ 0x7fffffff
#define __INT64_TYPE__ long int
#define __FLT_MAX_EXP__ 128
#define __ORDER_BIG_ENDIAN__ 4321
#define __DBL_MANT_DIG__ 53
#define __INT_LEAST64_MAX__ 0x7fffffffffffffffL
#define __GCC_ATOMIC_CHAR16_T_LOCK_FREE 2
#define __FP_FAST_FMAF32 1
#define __UINT_LEAST32_TYPE__ unsigned int
#define __SIZEOF_SHORT__ 2
#define __FLT32_NORM_MAX__ 3.40282346638528859811704183484516925e+38F32
#define __GCC_ATOMIC_BOOL_LOCK_FREE 2
#define __FLT64_MAX__ 1.79769313486231570814527423731704357e+308F64
#define __WINT_WIDTH__ 32
#define __FP_FAST_FMAF64 1
#define __INT_LEAST8_MAX__ 0x7f
#define __FLT32X_MAX_10_EXP__ 308
#define __SIZEOF_INT128__ 16
#define __FLT16_MIN__ 6.10351562500000000000000000000000000e-5F16
#define __LDBL_MAX_10_EXP__ 4932
#define __DBL_EPSILON__ ((double)2.22044604925031308084726333618164062e-16L)
#define __FLT32_MIN_EXP__ (-125)
#define __FLT128_MIN__ 3.36210314311209350626267781732175260e-4932F128
#define _LP64 1
#define __UINT8_C(c) c
#define __FLT64_MAX_EXP__ 1024
#define __INT_LEAST32_TYPE__ int
#define __UINT64_TYPE__ long unsigned int
#define __ARM_NEON 1
#define __FLT128_HAS_QUIET_NAN__ 1
#define __INTMAX_MAX__ 0x7fffffffffffffffL
#define __UINT_FAST8_TYPE__ unsigned char
#define __INT_FAST8_TYPE__ signed char
#define __FLT64X_MIN__ 3.36210314311209350626267781732175260e-4932F64x
#define __GNUC_STDC_INLINE__ 1
#define __FLT64_HAS_DENORM__ 1
#define __FLT32_EPSILON__ 1.19209289550781250000000000000000000e-7F32
#define __FP_FAST_FMAF32x 1
#define __FLT16_HAS_DENORM__ 1
#define __STDC_UTF_32__ 1
#define __INT_FAST8_WIDTH__ 8
#define __FLT32X_MAX__ 1.79769313486231570814527423731704357e+308F32x
#define __DBL_NORM_MAX__ ((double)1.79769313486231570814527423731704357e+308L)
#define __FLT64X_HAS_INFINITY__ 1
#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
#define __ARM_ALIGN_MAX_STACK_PWR 16
#define __LDBL_DENORM_MIN__ 6.47517511943802511092443895822764655e-4966L
#define __SIZEOF_WCHAR_T__ 4
#define unix 1
#define __UINT32_C(c) c ## U
#define __WINT_MIN__ 0U
#define __INT8_MAX__ 0x7f
#define __LONG_WIDTH__ 64
#define __PIC__ 2
#define __FLT32X_NORM_MAX__ 1.79769313486231570814527423731704357e+308F32x
#define __CHAR32_TYPE__ unsigned int
#define __ARM_FEATURE_NUMERIC_MAXMIN 1
#define __INT32_TYPE__ int
#define __SIZEOF_DOUBLE__ 8
#define __FLT64_MIN__ 2.22507385850720138309023271733240406e-308F64
#define __FLT_DENORM_MIN__ 1.40129846432481707092372958328991613e-45F
#define __INT_LEAST32_WIDTH__ 32
#define __SIZEOF_FLOAT__ 4
#define __ATOMIC_CONSUME 1
#define __GNUC_MINOR__ 4
#define __INT_FAST16_WIDTH__ 64
#define __UINTMAX_MAX__ 0xffffffffffffffffUL
#define __FLT32X_DENORM_MIN__ 4.94065645841246544176568792868221372e-324F32x
#define __DBL_MAX_10_EXP__ 308
#define __INT16_C(c) c
#define __ARM_ARCH_ISA_A64 1
#define __STDC__ 1
#define __PTRDIFF_TYPE__ long int
#define __FLT32_MIN__ 1.17549435082228750796873653722224568e-38F32
#define __ATOMIC_SEQ_CST 5
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 1
#define __UINT32_TYPE__ unsigned int
#define __FLT32X_MIN_10_EXP__ (-307)
#define __UINTPTR_TYPE__ long unsigned int
#define __linux__ 1
#define __LDBL_MIN_10_EXP__ (-4931)
#define __FLT128_EPSILON__ 1.92592994438723585305597794258492732e-34F128
#define __SIZEOF_LONG_LONG__ 8
#define __FLT128_DECIMAL_DIG__ 36
#define __GCC_ATOMIC_LLONG_LOCK_FREE 2
#define __FLT_DECIMAL_DIG__ 9
#define __UINT_FAST16_MAX__ 0xffffffffffffffffUL
#define __LDBL_NORM_MAX__ 1.18973149535723176508575932662800702e+4932L
#define __FLT_MIN_10_EXP__ (-37)
#define __GCC_ATOMIC_SHORT_LOCK_FREE 2
#define __ORDER_LITTLE_ENDIAN__ 1234
#define __SIZE_MAX__ 0xffffffffffffffffUL
#define __UINT_LEAST32_MAX__ 0xffffffffU
#define __ATOMIC_ACQ_REL 4
#define __ATOMIC_RELEASE 3