Re: Why doesn't gcc 4 like this?
Re: Why doesn't gcc 4 like this?
- Subject: Re: Why doesn't gcc 4 like this?
- From: Andrew Pinski <email@hidden>
- Date: Sat, 4 Jun 2005 16:22:38 -0400
On Jun 4, 2005, at 4:38 PM, Tim Conkling wrote:
For the following bit of code, gcc reports the following warning:
"/Users/tconklin/Everything Else/Programming/My
Projects/Gnomez/GnomeSpritez/source/Sprite/MySprite.cpp:298: warning:
target of assignment not really an lvalue; this will be a hard error
in the future":
short* srcRowStart;
...
((char*) srcRowStart) += framePort->getRowBytes(); <-- error here
(getRowBytes() returns a UInt32)
What does this warning mean?
"((char*) srcRowStart)" is not a lvalue which means it can be assigned
to.
You want to do the following instead:
srcRowStart = (short*)((char*)(srcRowStart) + framePort->getRowBytes());
which fixes the problem and turns this into valid C instead using a
removed extension from the FSF GCC 4.0.0, Apple added it back to their
4.0
but still questionable at what it should do.
Thanks,
Andrew Pinski
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