PostGIS 3.2 and GCC 14 & 15

[Devrim Gündüz]

Hi,

PostGIS 3.2 fails to build against GCC 14 and 15. The problem is that
RHEL 10 is out and we're losing both 3.2 and 3.1 (I'll send another
email about the problem in 3.1). This may be an upgrade problem for many
users:

========================================================
/usr/bin/make -C ../deps/flatgeobuf all
make[3]: Entering directory '/Projects/repo/pgrpms/rpm/redhat/main/non-common/postgis32/main/postgis32_15-3.2.8-build/postgis-3.2.8/deps/flatgeobuf'
gcc -std=c++11 -x c++ -I../../liblwgeom -Iinclude -I../../liblwgeom -I/include  -I/usr/geos313/include -I/usr/proj96/include  -I/usr/include/libxml2 -I/usr/include -I/usr/include/json-c  -DNDEBUG  -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64 -march=x86-64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -mtls-dialect=gnu2 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer   -fPIC -DPIC -Dflatbuffers=postgis_flatbuffers -c -o flatgeobuf_c.o flatgeobuf_c.cpp
In file included from include/flatbuffers/flatbuffers.h:21,
                 from feature_generated.h:7,
                 from flatgeobuf_c.cpp:26:
include/flatbuffers/stl_emulation.h: In member function ‘postgis_flatbuffers::span<T, Extent>& postgis_flatbuffers::span<T, Extent>::operator=(const postgis_flatbuffers::span<T, Extent>&)’:
include/flatbuffers/stl_emulation.h:549:12: error: assignment of read-only member ‘postgis_flatbuffers::span<T, Extent>::count_’ [-Wtemplate-body]
  549 |     count_ = other.count_;
      |     ~~~~~~~^~~~~~~~~~~~~~
flatgeobuf_c.cpp: In function ‘void flatgeobuf_create_index(ctx*)’:
flatgeobuf_c.cpp:198:10: warning: unused variable ‘oldoffset’ [-Wunused-variable]
  198 |     auto oldoffset = ctx->offset;
      |          ^~~~~~~~~
make[3]: *** [Makefile:54: flatgeobuf_c.o] Error 1
========================================================

Can you please take a look?

Thanks!

Regards,
-- 
Devrim Gündüz
Open Source Solution Architect, PostgreSQL Major Contributor
BlueSky: @devrim.gunduz.org , @gunduz.org
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