Re: Interpreting "undefined symbols"
Re: Interpreting "undefined symbols"
- Subject: Re: Interpreting "undefined symbols"
- From: Philip Aker <email@hidden>
- Date: Sun, 16 Dec 2007 04:18:53 -0800
On 2007-12-15, at 23:21:23, Adam wrote:
When modifying an OpenGL program that I found on
nehe.gamedev.net, for some reason I get the following error code:
/usr/bin/ld: Undefined symbols:
_main
collect2: ld returned 1 exit status
...and yet I have the main function defined! Sorry if this is a
stupid question or something, but my head hurts pretty bad right
now from trying to figure this out... I bet it's something
simple, but I can't figure it out.
I bet it's because your main function is in a C++ source and isn't
declared extern "C".
Even when I declared main() as extern "C", it had the errors.
I didn't have this problem until a short while ago, when I made
some minor changes to the program, and now I can't get any of my
Xcode projects to work - they all have this error message now. I
didn't change anything in the Xcode preferences, either. Any ideas?
All help is appreciated and thanks in advance.
Chances are this is a variant of the SDL OpenGL App project and you
tried to adapt it to your needs by changing a few names here and
there and thinking you could bypass the layer of 'main' shenanigans
SDL uses to work in a Cocoa app.
That's not going to work because at minimum you have to coordinate
the product and executable name change with the items in the
Info.plist of the target so that the resulting application has
Info.plist and InfoPlist.strings files with a valid ExecutableName/
BundleName values.
Then there's the 'main' stuff. I wouldn't recommend anything other
than finding the 'main' in the atlantis files and snapping your code
in there for this type of project.
OTOH, there is another example Xcode application in one or another of
the SDL distributions which has many targets. One of those might be
better for your purposes if you don't need the Cocoa.
HTH,
Philip Aker
echo email@hidden@nl | tr a-z@. p-za-o.@
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