DCC32.exe肯定众多D迷都用过，Dcc64.exe功能也类似，是用来编译支持64位windows平台的应用程序的编译器，Dcc64可以在微软视窗32位平台上运行，所以Dcc64是应用程序实现跨平台的利器，当然64位的windows开发环境它也是可以支持的。
稍后会介绍C++下跨OSX平台和Delphi下跨OSX平台的编译器揭秘
DCC64 功能揭秘
编译的原始整数类型都是64位的。（Native integer types are 64-bit）
指针也是64位。（Pointers are 64-bit.）
动态数组拥有64位的索引（Dynamic arrays have 64-bit indexes）
浮点运算有在single 和double 精度下运行，Extended 精度的浮点运算将不能支持。
SHL/SHR behavior:32位整形将转移到使用32位空间，64位整形将转变到使用64位的空间
混合的Pascal/汇编 代码将不会被支持。
命令行帮助
C:>dcc64 -h
Embarcadero Delphi for Win64 compiler version 23.0
Copyright (c) 1983,2011 Embarcadero Technologies, Inc.
Syntax: dcc64 [options] filename [options]
-A<unit>=<alias> = Set unit alias
-B = Build all units
-CC = Console target
-CG = GUI target
-D<syms> = Define conditionals
-E<path> = EXE/DLL output directory
-F<offset> = Find error
-GD = Detailed map file
-GP = Map file with publics
-GS = Map file with segments
-H = Output hint messages
-I<paths> = Include directories
-K<addr> = Set image base addr
-LE<path> = package .bpl output directory
-LN<path> = package .dcp output directory
-LU<package> = Use package
-M = Make modified units
-N0<path> = unit .dcu output directory
-NH<path> = unit .hpp output directory
-NO<path> = unit .obj output directory
-NB<path> = unit .bpi output directory
-NS<namespaces> = Namespace search path
-O<paths> = Object directories
-P = look for 8.3 file names also
-Q = Quiet compile
-R<paths> = Resource directories
-U<paths> = Unit directories
-V = Debug information in EXE
-VR = Generate remote debug (RSM)
-VT = Debug information in TDS
-W[+|-|^][warn_id] = Output warning messages
-Z = Output 'never build' DCPs
-$<dir> = Compiler directive
--help = Show this help screen
--version = Show name and version
--codepage:<cp> = specify source file encoding
--default-namespace:<namespace> = set namespace
--depends = output unit dependency information
--doc = output XML documentation
--drc = output resource string .drc file
--no-config = do not load default dcc64.cfg file
--description:<string> = set executable description
--inline:{on|off|auto} = function inlining control
--peflags:<flags> = set extra PE Header flags field
--peoptflags:<flags> = set extra PE Header optional flags field
--peosversion:<major>.<minor> = set OS Version fields in PE Header (default: 5.0)
--pesubsysversion:<major>.<minor> = set Subsystem Version fields in PE Header (default: 4.0)
--peuserversion:<major>.<minor> = set User Version fields in PE Header (default: 0.0)
Compiler switches: -$<letter><state> (defaults are shown below)
A8 Aligned record fields
B- Full boolean Evaluation
C+ Evaluate assertions at runtime
D+ Debug information
G+ Use imported data references
H+ Use long strings by default
I+ I/O checking
J- Writeable structured consts
L+ Local debug symbols
M- Runtime type info
O+ Optimization
P+ Open string params
Q- Integer overflow checking
R- Range checking
T- Typed @ operator
V+ Strict var-strings
W- Generate stack frames
X+ Extended syntax
Y+ Symbol reference info
Z1 Minimum size of enum types
Stack size: -$M<minStackSize[,maxStackSize]> (default 16384,1048576)
64-bit 内链汇编
DCC64.EXE 支持64位的汇编代码，但是有一些限制，书写必须要完整，在delphi或者汇编中，绝对不允许混用。
Pseudo-ops虚运算只能管理堆，下面的表中友一些详细的说明
Pseudo-op
.PARAMS#
Use this pseudo-instruction when calling external functions. This pseudo-instruction maps the function parameters in accordance with the x64 calling convention. When used, a pseudo-variable, @params, is available for passing stack parameters to called functions. Use @params as a byte array where the first stack parameter is @params[32], locations 0-31 represent the 4 register parameters.
.PUSHNV
REG Generates code to save and restore the non-volatile general purpose register in prologue and epilogue.
.SAVENV
XMM# Has the same functionality as .PUSHNV REG, except that .SAVENV XMM# is for non-volatile XMM registers.
.NOFRAME
Forcibly disables the generation of a stack frame as long as there are no local variables declared and the parameter count is less than 4. Use only for "leaf" functions.
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