On 10/07/2016 03:11 PM, Joseph Myers wrote:
> On Fri, 7 Oct 2016, Andreas Krebbel wrote:
>> wrt (c): float_t appears to be more widely used than I expected. But the 
>> only hits which might indicate potential ABI problems where in clucene 
>> and libassa. (I've scanned the header files of about 25k Ubuntu source 
>> packages).
> If it's two out of 25000 source packages whose ABIs might be affected, I 
> think that shows it's much safer as a change in glibc than moving to 
> _FILE_OFFSET_BITS=64 as a default (which I expect will happen when someone 
> puts the work in).  And probably safer than many past changes done through 
> symbol versioning.

Regarding (c) imagemagick is also affected (it wasn't really clear from my last 
email). Since it is
a widely used lib I think this counts as a blocker. The ABI relevant 
MagickRealType depends on the
size of float_t:

  Float_t is not an ABI type.
typedef float MagickRealType;
typedef float MagickRealType;
typedef double MagickRealType;
typedef long double MagickRealType;
# error Your float_t type is neither a float, nor a double, nor a long double

So I would prefer (b) which looks like a good compromise to me.


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