[postgis-tickets] [PostGIS] #4520: configure: WARNING: "Could not find a C++ standard library" in PostGIS 3.0.0beta1

[PostGIS]

#4520: configure: WARNING: "Could not find a C++ standard library" in PostGIS
3.0.0beta1
-----------------------+---------------------------
 Reporter:  jabakobob  |      Owner:  pramsey
     Type:  defect     |     Status:  new
 Priority:  medium     |  Milestone:  PostGIS 3.0.0
Component:  postgis    |    Version:  2.5.x
 Keywords:             |
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 I'd like to report a regression in PostGIS 3.0.0beta1 (versus PostGIS
 3.0.0alpha4)

 When I try to build PostGIS 3.0.0beta1, I get warnings about symbols not
 found in **libwagyu**

 So I checked the output from configure, and I found the following warning

 {{{
 configure: WARNING: "Could not find a C++ standard library"
 }}}

 It seems this warning occurs when trying to find linker flags for WAGYU.

 And indeed, if I check config.log, it seems that WAGYU_LDFLAGS is not set
 correctly:

 {{{
 $ grep WAGYU */config.log
 postgis-3.0.0alpha4/config.log:configure:18888: result: WAGYU: Wagyu usage
 requested
 postgis-3.0.0alpha4/config.log:HAVE_WAGYU='yes'
 postgis-3.0.0alpha4/config.log:WAGYU_CXX='gcc -std=c++11 -x c++'
 postgis-3.0.0alpha4/config.log:WAGYU_LDFLAGS='-lc++'
 postgis-3.0.0alpha4/config.log:WAGYU_LIB='libwagyu.la'
 postgis-3.0.0alpha4/config.log:#define HAVE_WAGYU 1
 postgis-3.0.0beta1/config.log:configure:18969: result: WAGYU: Wagyu usage
 requested
 postgis-3.0.0beta1/config.log:HAVE_WAGYU='yes'
 postgis-3.0.0beta1/config.log:WAGYU_CXX='gcc -std=c++11 -x c++'
 postgis-3.0.0beta1/config.log:WAGYU_LDFLAGS=''
 postgis-3.0.0beta1/config.log:WAGYU_LIB='libwagyu.la'
 postgis-3.0.0beta1/config.log:#define HAVE_WAGYU 1
 }}}

 I'm not sure why this happens, but I assume that the empty value for
 WAGYU_LDFLAGS is the reason that I get the missing symbol error later on.

-- 
Ticket URL: <https://trac.osgeo.org/postgis/ticket/4520>
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