[PD-dev] 64-bit warnings

[Hans-Christoph Steiner]

Hey,

I am just starting to work on making 64-bit builds for Mac OS X.  In  
the process I found a few compiler warnings that Apple added to gcc to  
help transition from 32-bit to 64-bit.  I enabled it on the pd- 
extended nightly builds and got a ton of warnings.  It seems like it  
would be worth checking out.

http://developer.apple.com/documentation/Darwin/Conceptual/64bitPorting/building/chapter_5_section_2.html

-Wconversion

     Although not technically new for 64-bit architectures, this  
option is mostly useful when transitioning 32-bit code to 64-bit. This  
flag causes additional warnings to be printed when certain conversions  
occur between data types of different sizes. Most of these warnings  
will not be useful, so you should not necessarily fix everything that  
generates a warning with this flag. However, you may sometimes find  
this flag useful for tracking down hard-to-find edge cases.

     In particular, this flag can also help track down edge cases in  
which a series of legal conversions result in an illegal conversion.  
For example, with this flag, the compiler will issue a warning if you  
assign a pointer to a 64-bit integer, pass that pointer into a 32-bit  
function argument, and subsequently convert the 64-bit function result  
back into a pointer.

-Wshorten-64-to-32

     This flag is like -Wconversion, but is specific to 64-bit data  
types. This flag causes GCC to issue a warning whenever a value is  
implicitly converted (truncated) from a 64-bit type to a 32-bit type.  
You should fix any warnings generated by this flag, as they are likely  
to be bugs.

.hc



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