[Gambas-bugtracker] Bug #2261: EXTERN function call does not work with Struct ?

[bugtracker at gambaswiki.org]

http://gambaswiki.org/bugtracker/edit?object=BUG.2261&from=L21haW4-

John ANDERSON reported a new bug.

Summary
-------

EXTERN function call does not work with Struct ?

Type             : Bug
Priority         : High
Gambas version   : Master
Product          : Development Environment


Description
-----------

According to:
http://gambaswiki.org/wiki/doc/extern

This call to Extern function should work if we are calling with a Struct of ABC, Gambas is supposed to setup the EXTERN call to be pointer to struct ABC data - according to wiki, I think.  Doesn't seem to work in supplied example.  I might not be interpreting Wiki the right way.

Don't be horrified at memmove, testing how Gambas works with EXTERN's and pointers.


System information
------------------

[System]
Gambas=3.16.90
OperatingSystem=Linux
Kernel=5.4.0-74-generic
Architecture=x86_64
Distribution=Linux Mint 20.1 Ulyssa
Desktop=CINNAMON
Font=Ubuntu,10
Scale=7
Theme=mint-y-aqua
Language=en_US.UTF-8
Memory=7868M

[Libraries]
Cairo=libcairo.so.2.11600.0
Curl=libcurl.so.4.6.0
DBus=libdbus-1.so.3.19.11
GDK2=libgdk-x11-2.0.so.0.2400.32
GDK3=libgdk-3.so.0.2404.16
GStreamer=libgstreamer-1.0.so.0.1602.0
GTK+2=libgtk-x11-2.0.so.0.2400.32
GTK+3=libgtk-3.so.0.2404.16
OpenGL=libGL.so.1.7.0
Poppler=libpoppler.so.97.0.0
QT5=libQt5Core.so.5.12.8
SDL=libSDL-1.2.so.0.11.4
SQLite=libsqlite3.so.0.8.6

[Environment]
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
DEFAULTS_PATH=/usr/share/gconf/cinnamon.default.path
DESKTOP_SESSION=cinnamon
DISPLAY=:0
GB_GUI=gb.gtk3
GDMSESSION=cinnamon
GDM_LANG=en_US
GENICAM_CLPROTOCOL=/opt/matrox_imaging/mil/../drivers/genicam/v3_2/bin/
GENICAM_MAJOR=3
GENICAM_MINOR=2
GIO_LAUNCHED_DESKTOP_FILE=<home>/Desktop/gambas3.desktop
GIO_LAUNCHED_DESKTOP_FILE_PID=10973
GNOME_DESKTOP_SESSION_ID=this-is-deprecated
GPG_AGENT_INFO=/run/user/1000/gnupg/S.gpg-agent:0:1
GTK3_MODULES=xapp-gtk3-module
GTK_MODULES=gail:atk-bridge
GTK_OVERLAY_SCROLLING=1
HOME=<home>
INSIDE_NEMO_PYTHON=
LANG=en_US.UTF-8
LANGUAGE=en_US.UTF-8
LC_ALL=en_US.UTF-8
LOGNAME=<user>
MANDATORY_PATH=/usr/share/gconf/cinnamon.mandatory.path
MILDIR=/opt/matrox_imaging/mil
MIL_GENICAM_PATH=/opt/matrox_imaging/mil/../drivers/genicam
MIL_XML_REPOSITORY=/opt/matrox_imaging/mil/../drivers/genicam/v3_2/xml/GenApi
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/opt/matrox_imaging/mil/../tools
PWD=<home>
QT_ACCESSIBILITY=1
QT_LOGGING_RULES=*.debug=false
QT_QPA_PLATFORMTHEME=qt5ct
SESSION_MANAGER=local/<hostname>:@/tmp/.ICE-unix/1131,unix/<hostname>:/tmp/.ICE-unix/1131
SHELL=/bin/bash
SHLVL=0
SSH_AGENT_PID=1224
SSH_AUTH_SOCK=/run/user/1000/keyring/ssh
TEMP=/tmp
TZ=:/etc/localtime
USER=<user>
XAUTHORITY=<home>/.Xauthority
XDG_CONFIG_DIRS=/etc/xdg/xdg-cinnamon:/etc/xdg
XDG_CURRENT_DESKTOP=X-Cinnamon
XDG_DATA_DIRS=/usr/share/cinnamon:/usr/share/gnome:<home>/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share
XDG_GREETER_DATA_DIR=/var/lib/lightdm-data/<user>
XDG_RUNTIME_DIR=/run/user/1000
XDG_SEAT=seat0
XDG_SEAT_PATH=/org/freedesktop/DisplayManager/Seat0
XDG_SESSION_CLASS=user
XDG_SESSION_DESKTOP=cinnamon
XDG_SESSION_ID=c1
XDG_SESSION_PATH=/org/freedesktop/DisplayManager/Session0
XDG_SESSION_TYPE=x11
XDG_VTNR=7