----- Forwarded by Andrew Hardy/MAIN/MC1 on 21/07/2004 15:30 -----
|---------+---------------------------->
| | Andrew Hardy |
| | |
| | 21/07/2004 15:29 |
| | |
|---------+---------------------------->
>--------------------------------------------------------------------------------------------------------------------------------------------------|
| |
| To: richard.harnden@lineone.net |
| cc: |
| Subject: Re: dynamic fixchar array ?(Document link: Andrew Hardy) |
>--------------------------------------------------------------------------------------------------------------------------------------------------|



Don't know if it helps, but...

Compiles and works fine with the array size as a literal.

Change the array size to a variable and no other changes and I get:

"density_view.ec", line 259: non-constant initializer: op "NAME"
"density_view.ec", line 291: cannot recover from previous errors

line 259 being the start of a while loop about half way down the function
following the first

EXEC SQL DECLARE
and
EXEC SQL OPEN

not the place I would have expected it to discover the error.

I presume VAL means variable length array. Is C99 a version of 'C'?

Are you saying you think VLAs are not in pre C99 and I'm probably running a
version of the esql C compiler earlier than C99?

Thanks.

Andrew H.



|---------+----------------------------->
| | Richard Harnden |
| | <richard.harnden@l|
| | ineone.net> |
| | Sent by: |
| | owner-informix-lis|
| | t@iiug.org |
| | |
| | |
| | 21/07/2004 11:58 |
| | Please respond to |
| | richard.harnden |
| | |
|---------+----------------------------->
>--------------------------------------------------------------------------------------------------------------------------------------------------|
| |
| To: informix-list@iiug.org |
| cc: |
| Subject: Re: dynamic fixchar array ? |
>--------------------------------------------------------------------------------------------------------------------------------------------------|




Andrew Hardy wrote:

> I want to read from a number of different posible versions of a table
where
> field1 may be nchar(x) where x nay vary over versions of the database.
> This situation already exists. I want the code below to select
> successfully based on db version. Based on db version the size of field1
> in the_table will be set, but I am having difficulty compiling a
> dynamically sized ESQL fixchar array.

And the error message was?

> fixchar data[the_size];

VLAs are C99, maybe that's the problem.

--
rh







sending to informix-list

Andrew Hardy wrote:
> Don't know if it helps, but...
>
> Compiles and works fine with the array size as a literal.

This is probably your best bet.

Might be worth trying with char, rather than fixchar.

>
> Change the array size to a variable and no other changes and I get:
>
> "density_view.ec", line 259: non-constant initializer: op "NAME"

That's a C error:

$cat foo.c
int foo(void);
int foo_value = foo();

$gcc foo.c
foo.c:2: initializer element is not constant

But it would be okay if 'int foo_value = foo();' was inside a function,
just not at file-scope.

I'm not sure why you would get that error at the start of a while loop.

Can't you post the relevant bits of the actual code?
It's difficult to second guess.

> "density_view.ec", line 291: cannot recover from previous errors
>
> line 259 being the start of a while loop about half way down the function
> following the first
>
> EXEC SQL DECLARE
> and
> EXEC SQL OPEN
>
> not the place I would have expected it to discover the error.
>
> I presume VAL means variable length array. Is C99 a version of 'C'?

s/VAL/VLA/g

Yes and yes.
The previous, and more common, standard was C89.

If your compiler doesn't whinge, then you're probably okay.

>
> Are you saying you think VLAs are not in pre C99 and I'm probably running a
> version of the esql C compiler earlier than C99?

No, they weren't. As a vendor specific extension, maybe.

C99 adds VLAs and // comments, pretty much.

The esql version shouldn't really matter, it's a pre-processor.

--
rh