[sdcc-devel] [ sdcc-Bugs-1450796 ] SIGSEGV Compiling pointer offset

[SourceForge.net <no...@so...>]

Bugs item #1450796, was opened at 2006-03-15 17:51
Message generated for change (Tracker Item Submitted) made by Item Submitter
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=100599&aid=1450796&group_id=599

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: pic16 target
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Alexander R. Enzmann (xan-der)
Assigned to: Nobody/Anonymous (nobody)
Summary: SIGSEGV Compiling pointer offset

Initial Comment:
SDCC : pic16/pic14 2.5.5 #1226 (Mar 15 2006) (MSVC)

sdcc crashes when compiling an offset to a pointer.  
Compiling the following code will cause the problem:

typedef struct _BDT
{
    char Stat;
    char Cnt;
    unsigned int ADDR;
} BDT; //Buffer Descriptor Table

char *inPtr;
char x;

BDT at 0x0400 ep0Bo;

static void SetFeature(char e)
{
    char endpointNum = e;
    inPtr = (char *)&ep0Bo + (endpointNum * 8);
}


Command line used to do the compile:
    sdcc -mpic16 -c badptr1.c
Output is:
    Caught signal 11: SIGSEGV

Note that if you replace "ep0Bo" by "x" in the 
function SetFeature(), sdcc will compile.  
Eliminating the "at 0x0400" from the declaration of 
ep0Bo will also result in compilation.  Appears the 
use of a fixed address in the variable declaration 
leads to the problem.

This problem was not in build 1209 so it was 
introduced somewhere between 1209 and 1226.

Xander

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=100599&aid=1450796&group_id=599