[sdcc-devel] [ sdcc-Bugs-770484 ] sizeof() on struct containing an array is wrong

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

Bugs item #770484, was opened at 2003-07-13 03:56
Message generated for change (Comment added) made by nobody
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=100599&aid=770484&group_id=599

Category: C-Front End
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Scott Bronson (bronson)
Assigned to: Nobody/Anonymous (nobody)
Summary: sizeof() on struct containing an array is wrong

Initial Comment:
With this program:

---------

typedef struct {
    unsigned char    length;
    unsigned char     unicode_data[];
} StringDescriptor;

StringDescriptor sd = {
    sizeof(sd),
    {
        'a', 0, 'b', 0, 'c', 0
    }
};

unsigned char d = sizeof(sd);

-----------

sizeof(sd) should be 7, but sdcc thinks it's 1.

Both the 8051 and Z80 code generation show problems
with this input, but they produce different output.


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

Comment By: Nobody/Anonymous (nobody)
Date: 2003-07-13 15:24

Message:
Logged In: NO 

This is invalid code. The compiler shouldn't accept it.

[tim@pauli /home/tim]$ cat test.c
typedef struct {
    unsigned char    length;
    unsigned char     unicode_data[];
} StringDescriptor;


[tim@pauli /home/tim]$ gcc -c -Wall -W -ansi -pedantic test.c
test.c:3: array size missing in `unicode_data'
[tim@pauli /home/tim]$

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

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=100599&aid=770484&group_id=599