[Xapian-tickets] [Xapian] #834: *BSD conditional to modify xapian-bindings/config.ac to suppress -lstdc++ library

[Xapian]

#834: *BSD conditional to modify xapian-bindings/config.ac to suppress -lstdc++
library
--------------------------+-------------------------------
 Reporter:  David Gessel  |             Owner:  Olly Betts
     Type:  defect        |            Status:  assigned
 Priority:  normal        |         Milestone:  1.4.27
Component:  Build system  |           Version:  1.4.22
 Severity:  normal        |        Resolution:
 Keywords:                |        Blocked By:
 Blocking:                |  Operating System:  FreeBSD
--------------------------+-------------------------------
Changes (by Olly Betts):

 * keywords:  -lstdc++, FreeBSD =>
 * status:  new => assigned
 * version:   => 1.4.22
 * component:  Other => Build system
 * milestone:   => 1.4.27

Comment:

 It's hard to know exactly what was going on in #430 as the interesting
 part of the log was not provided, but it was on "10.6.2 OS X" not FreeBSD
 anyway.  From the information provided it looks to me more like a
 discrepancy in what different things are expecting for the module
 extension (`.bundle` vs `.so`) which we never saw in an upstream build so
 it seems likely it was a discrepancy between upstream xapian-bindings and
 the ruby gem.  I think this annoying extension difference is an Apple
 invention, so not relevant for FreeBSD.

 This explicit linking to `-lstdc++` was actually added for OpenBSD (see
 the comment above it).  It could probably be limited to just OpenBSD (I
 think we didn't originally in case other platforms might need it too, but
 it makes the assumption that the standard C++ library in use is
 libstdc++).  If we're going to drop it for the BSDs it probably would be
 better to just drop it entirely.

 It was added in 2005, and OpenBSD now seems to use clang as the default
 compiler, but I couldn't trivially find if the default C++ standard
 library is now libstdc++ or libc++ (clang supports both).
 https://man.openbsd.org/intro.3 mentions both of them for example.

 If that default has changed, it might be we actually ought to explicitly
 link with `-lc++` on OpenBSD (or perhaps better determine which C++
 standard library is in use and explicitly link that).

 It's also possible that the "deliberate decision on the part of OpenBSD
 developers" that required this has changed since and this isn't required
 on OpenBSD any more.

 Unfortunately we don't have an OpenBSD CI job to easily test changes on.
 We're using https://github.com/vmactions for the non-Linux platform CI
 jobs and that has OpenBSD support so hopefully it's easy to add.  I'll
 have a go.
-- 
Ticket URL: <https://trac.xapian.org/ticket/834#comment:1>
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