Hi Ruben,

MacRuby cannot call vararg functions without proper BridgeSupport metadata, because there is no way it can determine at runtime if a function is variadic or not (because the call site must be compiled differently).

You may need to generate a BridgeSupport file for the wrapper you use. See the gen_bridge_metadata(1) man page for more info.

If the wrapper is a framework, you just copy the file in the Resources/BridgeSupport directory (as documented in the man page), then calling #framework from MacRuby will automatically parse it for you.

If the wrapper is a library that you link statically with your app, you will have to ship the BridgeSupport file in your app bundle, then use the #load_bridge_support_file method from the MacRuby side to load it up.

Laurent

On Jan 5, 2011, at 10:29 AM, Ruben Fonseca wrote:

Hi all.

I'm trying to build a MacRuby 0.8 app with XCode. I want to interact with
an exisitng Sqlite3 database. Since I don't want to package or mess with
any Rubygem, I decided to look into existing Objective-C Sqlite wrappers.

I've tried PLDatabase and fmdb, and failed with both. The code compiles and
the application runs, but when calling a C function what accepts a va_arg
argument list, my app receives a EXC_BAD_INSTRUCTION.

Example:

Objective-C function interface:

- (FMResultSet *)executeQuery:(NSString*)sql, ... {

Ruby code

db.executeQuery "SELECT * FROM call"

it receives the error on this C line inside the executeQuery function

va_start(args, sql);

Any hints? Do you recommend a simple way of interacting with a Sqlite3
app with macruby + xcode, without using any gems?

Thank you
Ruben
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