Bug #96076 item_geofunc_relchecks_bgwrap -Werror=maybe-uninitialized]

• Submitted: 2 Jul 2019 12:53
• Modified: 12 Jul 2019 18:30
• Reporter: Tor Didriksen
• Status: Closed
• Category: MySQL Server: Compiling
• Severity: S3 (Non-critical)
• Version: 8.0.18
• OS: Any
• CPU Architecture: Any

[2 Jul 2019 12:53] Tor Didriksen

Description:
sql/item_geofunc_relchecks_bgwrap.cc:
In static member function
static int BG_wrap<Geom_types>::multipoint_disjoint_multi_geometry(const Multipoint&, const Geom_type&) [with Geom_type = Gis_multi_polygon; Geom_types = BG_models<boost::geometry::cs::cartesian>]:

sql/item_geofunc_relchecks_bgwrap.cc:496:44: error: *((void*)& box +24) may be used uninitialized in this function [-Werror=maybe-uninitialized]
                rtree.qbegin(bgi::intersects(box));
                             ~~~~~~~~~~~~~~~^~~~~

How to repeat:
Linux ellex07 4.18.0-32.el8.aarch64 #1 SMP Thu Mar 28 15:54:26 PDT 2019
aarch64 aarch64 aarch64 GNU/Linux

$cat /etc/os-release
NAME="Oracle Linux Server"
VERSION="8.0"
ID="ol"
VARIANT="Server"
VARIANT_ID="server"
VERSION_ID="8.0"
PLATFORM_ID="platform:el8"
PRETTY_NAME="Oracle Linux Server 8.0"

cmake <path to source> -DMYSQL_MAINTAINER_MODE=1
make mysqld

Suggested fix:
Silence warning, as compiler bug?? (not seen anywhere else)

[12 Jul 2019 18:30] Paul DuBois

Posted by developer:
 
Fixed in 8.0.18.

Code cleanup. No changelog entry required.