* possible defines for compiler compilation updated

+ FPU_EMULATION define
  * many updates to be consistent with version 1.0.7

docs/prog.tex

@@ -2167,7 +2167,7 @@ MMX operations, so be careful.
 
 The MMX instructions are optimized for multi media (what else?).
 So it isn't possible to perform each operation, some operations
-give a type mismatch, see section \ref {se:SupportedMMX} for the supported
+give a type mismatch, see section \ref{se:SupportedMMX} for the supported
 MMX operations
 
 An important restriction is that MMX operations aren't range or overflow
@@ -2301,7 +2301,7 @@ scratch regs. & N/A \\
 
 \begin{FPCltable}{ll}{Motorola 680x0 Register table}{680x0Regs} \hline
 Generic register name & CPU Register name \\ \hline
-accumulator & D0 \\
+accumulator & D0\footnotemark \\
 accumulator (64-bit) high / low & D0:D1 \\
 float result & FP0\footnotemark\\
 self & A5 \\
@@ -2310,7 +2310,10 @@ stack pointer & A7 \\
 scratch regs. & D0, D1, A0, A1, FP0, FP1 \\
 \end{FPCltable}
 
-\footnotetext{On simulated FPU's the result is returned in D0}
+\addtocounter{footnote}{-1}\footnotetext{For compatibility with some C compilers, when
+the function result is a pointer and is declared with the cdecl convention,
+the result is also stored in the A0 register}
+\addtocounter{footnote}{1}\footnotetext{On simulated FPU's the result is returned in D0}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % Name mangling
@@ -2717,12 +2720,11 @@ Standard entry code for procedures and functions is as follows on the
    move.l  sp,a6
 \end{verbatim}
 
-The generated exit sequence for procedure and functions looks as follows:
+The generated exit sequence for procedure and functions looks as follows
+(in the default processor mode):
 \begin{verbatim}
    unlk   a6
-   move.l (sp)+,a0     ; Get return address
-   add.l  #xx,sp       ; Remove allocated stack
-   move.l a0,-(sp)     ; Put back return address on top of the stack
+   rtd    #xx
 \end{verbatim}
 
 Where \var{xx} is the total size of the pushed parameters.
@@ -2779,8 +2781,9 @@ parameter actually takes less then 4 bytes to store on the stack (such
 as passing a byte value parameter to the stack).
 
 
-
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \section{Processor limitations}
+\label{se:ProcessorLimits}
 
 Certain processors have limitations on the size of the parameters
 and local variables in routines. This is shown in \seet{CPULimits}.
@@ -4835,6 +4838,9 @@ use longword and longint variables.
 \item Write your if/then/else statements so that the code in the "then"-part
 gets executed most of the time (improves the rate of successful jump prediction).
 
+\item Do not use ansistrings, widestrings and exception support, as these 
+require a lot of code overhead.
+
 \item Profile your code (see the -pg switch) to find out where the
 bottlenecks are. If you want, you can rewrite those parts in assembler.
 You can take the code generated by the compiler as a starting point. When
@@ -4865,11 +4871,13 @@ about 1 additional instruction after each subroutine call.
 \item Use the smartlinking options for all your units
 (including the \var{system} unit).
 
-\item Do not use ansistrings and exception support, as these require
-a lot of code overhead.
+\item Do not use ansistrings, widestrings and exception support, as these 
+require a lot of code overhead.
 
 \item Turn off range checking and stack-checking.
 
+\item Turn off runtime type information generation
+
 \end{itemize}
 
 
@@ -5617,17 +5625,18 @@ units as well as generic versions of processor specific routines.
 
 \chapter{Compiler limits}
 \label{ch:AppC}
-Although many of the restrictions imposed by the MS-DOS system are removed
-by use of an extender, or use of another operating system, there still are
-some limitations to the compiler:
+There are certain compiler limits inherent to the compiler:
 \begin{enumerate}
 \item Procedure or Function definitions can be nested to a level of 32.
-\item Maximally 255 units can be used in a program when using the real-mode
-compiler (i.e. a binary that was compiled by Borland Pascal). When using the 32-bit compiler, the limit is set to 1024. You can
-change this by redefining the \var{maxunits} constant in the
-\file{files.pas} compiler source file.
+\item Maximally 1024 units can be used in a program when using the compiler.
+You can change this by redefining the \var{maxunits} constant in the compiler 
+source file.
+\item Arrays are limited to 2 GBytes in size in the default processor mode.
 \end{enumerate}
 
+For processor specific compiler limitations refer to the Processor
+Limitations section in this guide (\ref{se:ProcessorLimits}).
+
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % Appendix D
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@@ -5653,7 +5662,8 @@ parameters when implementing the function or procedure.
 \item PChars are converted to strings automatically.
 \end{enumerate}
 \section{TP mode}
-This mode is selected by the \var{{\$MODE TP}} switch. On the command-line,
+This mode is selected by the \var{{\$MODE TP}} switch. It tries to emulate, 
+as closely as possible, the behavior of Turbo Pascal 7. On the command-line,
 this mode is selected by the \var{-So} switch.
 
 \begin{enumerate}
@@ -5669,7 +5679,8 @@ parameters when implementing the function or procedure.
 \item You can not use the cvar type.
 \end{enumerate}
 \section{Delphi mode}
-This mode is selected by the \var{{\$MODE DELPHI}} switch. On the command-line,
+This mode is selected by the \var{{\$MODE DELPHI}} switch. It tries to emulate,
+as closely as possible, the behavior of Delphi 4. On the command-line,
 this mode is selected by the \var{-Sd} switch.
 \begin{enumerate}
 \item You can not use the address operator to assign procedural variables.
@@ -6685,14 +6696,13 @@ is on the system. If the compiler should be compiled with the RTL that was
 compiled first, this should be \file{../rtl/OS} (replace the OS with the 
 appropriate operating system subdirectory of the RTL).
 \item A define with the processor for which the compiler is compiled for. Required.
-\item \var{-dGDB} is not strictly needed, but is better to add since
-otherwise compiling with debug information will not be possible.
+\item \var{-dGDB}. Required.
 \item \var{-Sg} is needed, some parts of the compiler use \var{goto}
 statements (to be specific: the scanner).
 \end{enumerate}
 So the absolute minimal command line is
 \begin{verbatim}
-ppc386 -di386 -Sg pp.pas
+ppc386 -di386 -dGDB -Sg pp.pas
 \end{verbatim}
 
 Some other command-line options can be used, but the above are the
@@ -6700,22 +6710,19 @@ minimum. A list of recognised options can be found in \seet{FPCdefines}.
 
 \begin{FPCltable}{ll}{Possible defines when compiling FPC}{FPCdefines}
 Define & does what \\ \hline
-USE\_RHIDE & Generates errors and warnings in a format recognized\\
-& by \file{rhide}. \\
 TP & Needed to compile the compiler with Turbo or Borland Pascal. \\
-Delphi & Needed to compile the compiler with Delphi from Borland. \\
-GDB & Support of the GNU Debugger. \\
+GDB & Support of the GNU Debugger (required switch). \\
 I386 & Generate a compiler for the Intel i386+ processor family. \\
-M68K & Generate a compiler for the M68000 processor family. \\
-USEOVERLAY & Compiles a TP version which uses overlays. \\
+M68K & Generate a compiler for the M680x0 processor family. \\
 EXTDEBUG & Some extra debug code is executed. \\
+MEMDEBUG & Some memory usage information is displayed. \\
 SUPPORT\_MMX & only i386: enables the compiler switch \var{MMX} which \\
  &allows the compiler to generate  MMX instructions.\\
 EXTERN\_MSG & Don't compile the msgfiles in the compiler, always use \\
 & external messagefiles (default for TP).\\
-NOAG386INT & no Intel Assembler output.\\
-NOAG386NSM & no NASM output.\\
-NOAG386BIN & leaves out the binary writer.\\ \hline
+LOGSECONDPASS & Write compiler node information in assembler output. \\
+NOOPT & Do not include the optimizer in the compiler. \\
+\hline
 \end{FPCltable}
 This list may be subject to change, the source file \file{pp.pas} always
 contains an up-to-date list.
@@ -6750,6 +6757,8 @@ ENDIAN\_LITTLE & Defined when the \fpc target is a little-endian processor \\
 & (80x86, Alpha, ARM). \\
 ENDIAN\_BIG & Defined when the \fpc target is a big-endian processor \\
 & (680x0, PowerPC, SPARC, MIPS). \\
+FPU\_EMULATION & Defined when the \fpc target uses floating-point software \\
+& emulation. \\
 FPC\_DELPHI & \fpc is in Delphi mode, either using compiler switch -Sd or \\
 & using the \var{\$MODE DELPHI} directive. \\
 FPC\_OBJFPC & \fpc is in Delphi mode, either using compiler switch -S2 or \\
@@ -6762,7 +6771,8 @@ FPC\_GPC & \fpc is in GNU Pascal mode, either using compiler switch -Sp or \\
 
 \begin{remark}
 The \var{ENDIAN\_LITTLE} and \var{ENDIAN\_BIG} defines were added
-starting from \fpc version 1.0.5.
+starting from \fpc version 1.0.5. The \var{FPU\_EMULATION} define
+was added starting from \fpc version 1.0.7.
 \end{remark}
 
 \begin{FPCltable}{ll}{Possible CPU defines when compiling using FPC}{FPCCPUdefines}