(gdbint.info)Native Conditionals


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Native Conditionals
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   When GDB is configured and compiled, various macros are defined or
left undefined, to control compilation when the host and target systems
are the same.  These macros should be defined (or left undefined) in
`nm-SYSTEM.h'.

`ATTACH_DETACH'
     If defined, then gdb will include support for the `attach' and
     `detach' commands.

`FETCH_INFERIOR_REGISTERS'
     Define this if the native-dependent code will provide its own
     routines `fetch_inferior_registers' and `store_inferior_registers'
     in `HOST-nat.c'.  If this symbol is *not* defined, and
     `infptrace.c' is included in this configuration, the default
     routines in `infptrace.c' are used for these functions.

`GET_LONGJMP_TARGET'
     For most machines, this is a target-dependent parameter.  On the
     DECstation and the Iris, this is a native-dependent parameter,
     since <setjmp.h> is needed to define it.

     This macro determines the target PC address that longjmp() will
     jump to, assuming that we have just stopped at a longjmp
     breakpoint.  It takes a CORE_ADDR * as argument, and stores the
     target PC value through this pointer.  It examines the current
     state of the machine as needed.

`PROC_NAME_FMT'
     Defines the format for the name of a `/proc' device.  Should be
     defined in `nm.h' *only* in order to override the default
     definition in `procfs.c'.

`PTRACE_FP_BUG'
     mach386-xdep.c

`PTRACE_ARG3_TYPE'
     The type of the third argument to the `ptrace' system call, if it
     exists and is different from `int'.

`REGISTER_U_ADDR'
     Defines the offset of the registers in the "u area"; Note: Host..

`USE_PROC_FS'
     This determines whether small routines in `*-tdep.c', which
     translate register values between GDB's internal representation
     and the /proc representation, are compiled.

`U_REGS_OFFSET'
     This is the offset of the registers in the upage.  It need only be
     defined if the generic ptrace register access routines in
     `infptrace.c' are being used (that is, `infptrace.c' is configured
     in, and `FETCH_INFERIOR_REGISTERS' is not defined).  If the
     default value from `infptrace.c' is good enough, leave it
     undefined.

     The default value means that u.u_ar0 *points to* the location of
     the registers.  I'm guessing that `#define U_REGS_OFFSET 0' means
     that u.u_ar0 *is* the location of the registers.


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