** Changed in: ubuntu-z-systems
Status: Triaged => In Progress
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https://bugs.launchpad.net/bugs/1913388
Title:
clucene-core: please pull in patch to stabilize API on s390x during
upgrade to glibc 2.33
Status in Ubuntu on IBM z Systems:
In Progress
Status in clucene-core package in Ubuntu:
In Progress
Bug description:
On s390x, the type float_t has historically been defined as double for
no good reason, yet with unexpected and unnecessary impact on
performance in some scenarios. The upcoming glibc release 2.33 will be
a first step towards cleaning that up, which will change float_t to
become float on s390x when compiling C++ code, such as in clucene-
core. That would break the ABI of clucene-core on s390x for existing
binaries.
Today, clucene-core uses float_t for some parameters in its API; that
type is defined as double on s390x today. Together with gcc's default
behavior, that contradicts the C standard. To get to a more sane
combination, the upcoming glibc release 2.33 will change float_t to
become float on s390x (with some exceptions when compiling C code,
which do not apply for clucene-core). To my knowledge, glibc 2.33 is a
candidate for inclusion in Ubuntu 21.04.
To avoid breaking the API of clucene-core in the process, I have
prepared a trivial patch that fixes clucene-core's API to always use
double instead of float_t on s390x. That patch effectively persists
the current de-facto API on s390x, without changes for other
architectures. Note that using float_t in an API is generally "not a
great idea", because that type can have different definitions even
with the same compiler and glibc version on the same system (e.g., on
32-bit x86, when switching between SSE and x87 FP ops).
Patch submitted in https://sourceforge.net/p/clucene/bugs/233/ and
https://sourceforge.net/p/clucene/mailman/message/37153930/
yet upstream clucene is effectively unmaintained.
If Ubuntu 21.04 adopts glibc 2.33, please consider pulling in this
patch in clucene-core.
Related request for ImageMagick:
https://bugs.launchpad.net/ubuntu/+source/imagemagick/+bug/1913268
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