Hi, Sandro.
On Wednesday, 10 January 2018 at 14:58, Sandro Mani wrote:
I've received a request to package a version of scotch with 64bit
integers
(as opposed to 32bit). I suppose the details are less important, the bottom
line is
scotch 32bit: typedef int32_t SCOTCH_Num;
scotch 64bit: typedef int64_t SCOTCH_Num;
where SCOTCH_Num affects the public ABI and is used by third parties which
use scotch.
Upstream allows selecting the integer size at compile-time (i.e. passing
-DINTSIZE64 for int64_t). However, this choice has no effect on the library
name, so vanilla upstream will build a library named libscotch.so regardless
of how you configure it.
Why don't you talk to upstream about this. Having the two builds
parallel-installable would be a benefit for everyone. Please take a look
at what we did in openblas and arpack
(
https://github.com/opencollab/arpack-ng/issues/30)
Hopefully that will convince upstream to support library name suffixing.
I'm skeptical whether introducing a downstream scotch64 package
with i.e.
libscotch64.so is a good solution, given that possibly no build system of
third-party software using scotch knows about libscotch64.so and would need
to be carefully patched (i.e. to not mix parts using libscotch and those
using libscotch64). Also, introducing downstream specific suffixes is never
a good idea.
In general yes, but in this domain it's a common trend (openblas and
arpack are doing it already).
The alternative would be to just switch the main scotch package to
64bit
integers, but this may be undesirable for memory-bound applications which
rely on the smaller memory-usage of 32bit integers.
Type incompatibility (narrowing) could also be an issue.
I'm not really sure whether there is a good solution, happy to
hear
opinions.
I'd open a discussion with upstream to see where it goes.
Regards,
Dominik
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