+ added some missing options

docs/user.tex

@@ -1075,6 +1075,8 @@ integer errors, a run-time error will be generated by your program.
 \item [-Cr] \olabel{Cr} Generate Range checking code. In case your program
 acesses an array element with an invalid index, or if it increases an
 enumerated type beyond it's scope, a run-time error will be generated.
+\item [-CR] \olabel{CR} Generate checks when calling methods to verify
+if the virtual method table for that object is valid.
 \item [-Csxxx] \olabel{Cs} Set stack size to \var{xxx}.
 \item [-Ct] \olabel{Ct} generate stack checking code. In case your program
 performs a faulty stack operation, a run-rime error will be generated.
@@ -1090,7 +1092,9 @@ to conditionally compile parts of your code.
 \item [-gg] idem as \var{-g}.
 \item [-gd] \olabel{gd} generate debugging info for \file{dbx}.
 \item [-gh] use the heaptrc unit (see \unitsref).
-\item [-gc] generate checks for pointers.
+\item [-gc] generate checks for pointers. This must be used with the
+\var{-gh} command-line option. When this options is enabled, it will verify 
+that all pointer accesses are within the heap.
 \item[-kxxx] pass \var{xxx} to the linker. 
 \item[-Oxxx] \olabel{O} optimize the compiler's output; \var{xxx} can have one
 of the following values :
@@ -1136,12 +1140,12 @@ the following:
 of the \var{-d} option.
 \item [-Ur] \olabel{Ur} Generate release unit files. These files will not be
 recompiled, even when the sources are available. This is useful when making
-release distributions.
+release distributions. This also overrides the \var{-B} option for release 
+mode units.
 \item [-Xx] \olabel{X} executable options. This tells the compiler what
 kind of executable should be generated. the parameter \var{x}
 can be one of the following:
 \begin{itemize}
-% \item \textbf{e} : (\linux only) Create an \file{ELF} executable (default).
 \item \textbf{c} : (\linux only) Link with the C library. You should only use this when
   you start to port \fpc to another operating system. \olabel{Xe}
 \item \textbf{D} : Link with dynamic libraries (defines the
@@ -3397,8 +3401,10 @@ The stack has grown beyond its maximum size (in which case the size of
 local variables should be reduced to avoid this error), or the stack has 
 become corrupt. This error is only reported when stack checking is enabled.
 \item [203  Heap overflow error]
-The heap has grown beyond its boundaries, and you are trying to get more
-memory. Please note that \fpc provides a growing heap, i.e. the heap will
+The heap has grown beyond its boundaries. This is caused when trying to allocate
+memory exlicitly with \var{new}, \var{getmem} or \var{reallocmem}, or when
+a class or object instance is created and no memory is left. Please note 
+that, by default, \fpc provides a growing heap, i.e. the heap will
 try to allocate more memory if needed. However, if the heap has reached the
 maximum size allowed by the operating system or hardware, then you will get
 this error.