Disable features in cmake command line

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Identical to "./configure --help", when a project uses cmake, we get building instructions like below,

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mkdir bld
cd bld
cmake ..
cmake . -L

wait a while we will see all the variables cmake defined in cache.

Or directly look into CMakeCache.txt.

If we want to modify a variable to off, or say, disable some functionality,

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FEATURE_test_name:BOOL=ON

we run cmake once again like this,

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cmake -DFEATURE_test_name:BOOL=OFF ..

refer to:
https://www.oschina.net/question/231677_45266

Build qt source in Fedora35

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Extract qt-everywhere-src-6.2.2.zip to directory named qt,

sudo dnf install libxcb libxcb-devel xcb-util xcb-util-devel xcb-util-*-devel libX11-devel libXrender-devel libxkbcommon-devel libxkbcommon-x11-devel libXi-devel libdrm-devel libXcursor-devel libXcomposite-devel

cd qt
mkdir bld
cd bld
cmake -G Ninja -DCMAKE_INSTALL_PREFIX:PATH=`pwd`/installed -DCMAKE_BUILD_TYPE="Debug" ..
cmake --build . --parallel
cmake --install . --prefix=`pwd`/installed

Can't locate English.pm in @INC

sudo dnf install perl-English

This application failed to start because no Qt platform plugin could be init...

If "xcb" things missing, we should "dnf install libxcb..." like above, and an annoying step we can't image is after we install required packages, we must delete CMakeCache.txt first and then to invoke cmake, if not, some modules like xcb-sm are always displayed not to be built.

Feature accessibility_atspi_bridge is already defined to be "OFF" and should now be set to "ON" when importing features from Qt6::Gui.

We only need to not let the message interrupt building progress,

/mnt/SDC2/qt/bld/installed/lib/cmake/Qt6/QtFeature.cmake:1136

	message(STATUS "Feature ${feature} is already defined to be \"${QT_FEATURE_${feature}}\" and should now be set to \"${value}\" when importing features from ${target}.")

refer to:
https://download.qt.io/official_releases/qtcreator/6.0/6.0.1/qt-creator-opensource-linux-x86_64-6.0.1.run
https://wiki.qt.io/Building_Qt_5_from_Git#Linux.2FX11
https://forum.qt.io/topic/121386/built-qt6-from-sources-problem-with-xcb-plugin/15
https://forum.qt.io/topic/128887/build-qt6-from-source-xcb-issue/3
https://forum.qt.io/topic/92834/configure-errors-disabling-x11-accessibility-bridge-d-bus-or-at-spi-is-missing/7

Debug ue4 in Fedora35

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After running Setup.sh and GenerateProjectFiles.sh, we found UE4.pro created. It's like a fresh breeze coming from the roof window, we are free now, no more need to fear the once unbearable torment in Visual Studio IDE.

Qt source is not necessary to ue4, qtcreator is only a visual debugger to ue4.

Build Steps:

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make UE4Editor-Linux-Debug ShaderCompileWorker-Linux-Debug -j8

Clean Steps:

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make UE4Editor-Linux-Debug ShaderCompileWorker-Linux-Debug ARGS=-clean -j8

refer to:
https://docs.unrealengine.com/4.27/en-US/SharingAndReleasing/Linux/BeginnerLinuxDeveloper/SettingUpQtCreator/

Build qemu in Fedora35

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Build,

sudo dnf install ninja-build pixman-devel

cd qemu-6.2.0
mkdir bld
cd bld
../configure --enable-kvm --target-list=x86_64-softmmu --prefix=`pwd`/installed
make

Inspect through vnc,

dnf install vinagre

cd x86_64-softmmu
./qemu-system-x86_64 -m 3500 -smp 4 --enable-kvm -boot d -hda /mnt/DATA/vmimg/win7/win7.vmdk

Open vinagre, input "127.0.0.1:5900" in VNC host box, then connect, after a while we will see win7 running up.

Run in local gui,

sudo dnf install libepoxy-devel gtk3-devel

cd bld
../configure --enable-kvm --enable-gtk --enable-opengl --target-list=x86_64-softmmu --prefix=`pwd`/installed

cd x86_64-softmmu
./qemu-system-x86_64 -m 3500 -smp 4 --enable-kvm -display gtk,gl=on -vga vmware -usb -device usb-kbd -device usb-audio -boot c -netdev user,id=mynet0 -device e1000-82545em,netdev=mynet0 -boot d -hda /mnt/DATA/vmimg/win7/win7.vmdk

Frankly, qemu gui is not user friendly, and I have not found the way to setup 3d presentation in guest win7 yet.

refer to:
https://blog.csdn.net/haifeng_gu/article/details/108055083
https://blog.csdn.net/wanghuiyao/article/details/65627198

Build virtualbox in Ubuntu

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Similar to in Fedora35, total difference is in from apt or from yum.

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sudo apt-get install acpica-tools chrpath doxygen g++-multilib libasound2-dev libcap-dev \
        libcurl4-openssl-dev libdevmapper-dev libidl-dev libopus-dev libpam0g-dev \
        libpulse-dev libqt5opengl5-dev libqt5x11extras5-dev qttools5-dev libsdl1.2-dev libsdl-ttf2.0-dev \
        libssl-dev libvpx-dev libxcursor-dev libxinerama-dev libxml2-dev libxml2-utils \
        libxmu-dev libxrandr-dev make nasm python3-dev qttools5-dev-tools \
        unzip xsltproc glslang-dev glslang-tools \
        libstdc++5 libxslt1-dev linux-kernel-headers makeself \
        mesa-common-dev subversion yasm zlib1g-dev

refer to:
build virtualbox in fedora35

Fedora kernel: bad shim signature

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One easy method is disabling Secure Boot option in machine EFI BIOS.

In other way, we can't sign vmlinuz using MOK, because MOK is only a gate keeper for kernel after vmlinuz booting up, and if we want EFI firmware to admit vmlinuz as descendant, we must require the machine manufacturer to sign the vmlinuz we built.

MOK: Machine Owner Key
UEFI: Unified Extensible Firmware Interface

refer to:
https://www.rodsbooks.com/efi-bootloaders/secureboot.html

Re-compress all Mame zip roms to 7z format

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In advance,

trans_to_7z.sh

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#!/bin/bash
 
PARENTDIR=$1
TMPDIR=`pwd`/tmp
 
PATH="/d/cext/Program Files/7-Zip:$PATH"
 
ISERR="no"
 
if [ "x$1" = x ] ; then
	echo "Please input dir to transform."
	exit
fi
 
if [ -e "$TMPDIR" ] ; then
	echo "Please rmdir [$TMPDIR] first."
	exit
fi
 
get_win_path()
{
	local win_path="$1"
	win_path="${win_path#/}"
	win_path="${win_path//\//\\}"
	win_path="${win_path/\\/\:\\}"
	echo $win_path
}
 
format_transform()
{
	local file_7z=$1
	local file_zip=$2
	local tmp_dir=$TMPDIR
	mkdir "$tmp_dir"
 
	7z x ${file_7z} -o"`get_win_path \"$tmp_dir\"`"
	(
		cd "$tmp_dir"
		ls
 
		7z a -mx9 "`get_win_path \"${file_zip}\"`" || ( echo "Creating 7z file failed." && ISERR="yes" )
	)
 
	rm -Rf "$tmp_dir"
}
 
cd "$PARENTDIR"
 
for fn in `ls *.zip`; do
 
	echo "$fn"
 
	format_transform $fn "`pwd`/${fn%.zip}.7z"
 
	if [ $ISERR = "yes" ]; then
		exit
	fi
done
 
echo "Transforming done."

How to use?

Copy trans_to_7z.sh to Mame root folder which contains roms sub-directory, right click at blank place of this Mame root window in Explorer, select "Git Bash Here" which prompts bash console, input below and return,

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./trans_to_7z.sh roms

refer to:
https://www.cnblogs.com/wq242424/p/15564203.html

Switch between GPUs in Fedora35

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Install Nvidia driver from rpmfusion, 

yum install --nogpgcheck https://mirrors.tuna.tsinghua.edu.cn/rpmfusion/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm https://mirrors.tuna.tsinghua.edu.cn/rpmfusion/nonfree/fedora/rpmfusion-nonfree-release-$(rpm -E %fedora).noarch.rpm
dnf install akmod-nvidia

Before rebooting, must sign nividia driver using MOK.der, if not, we will receive at boot, "nvidia kernel module missing. falling back to nouveau".

Or install Nvidia driver from official site,

Clean up akmod-nvidia,

dnf remove akmod-nvidia
dnf remove xorg-x11-drv-nvidia

To blacklist the nouveau drivers,

dracut -v /boot/initramfs-`uname -r`.img `uname -r` --force

/etc/default/grub

GRUB_CMDLINE_LINUX="rhgb quiet rd.driver.blacklist=nouveau modprobe.blacklist=nouveau nvidia-drm.modeset=1"

grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg

After rebooting, download NVIDIA-Linux-x86_64-XXX.XX.XX.run from official site, install it using /root/signed-modules/MOK.* and reboot,
https://www.nvidia.com/download/index.aspx?lang=en-us

Check current GPU vendor, 

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glxinfo | egrep "OpenGL vendor|OpenGL renderer"

How to dynamically switch GPUs?

I found ue4 selecting /dev/nvidia0 by itself, we needn't care about if switch.

https://pellegrino.link/2015/11/29/signing-nvidia-proprietary-driver-on-fedora.html
https://www.cnblogs.com/Mingxx/p/3192483.html
https://docs.fedoraproject.org/en-US/quick-docs/how-to-set-nvidia-as-primary-gpu-on-optimus-based-laptops/

Play mame in Linux handily

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dnf install mame

in ~/.bashrc

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MAME_DATABASE=/to/path/of/mame
alias mame_go="mame -window -rompath ${MAME_DATABASE}/roms -snapshot_directory ${MAME_DATABASE}/snap "

how to play,

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# open game list.
mame_go
# or quickly into play.
mame_go sf2ce

Other emulators,

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# fc nes
dnf install fceux
# ps2
dnf install pcsx2

Virtualbox memo

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hgcmThread, hgcmServiceThread
	HGCM_MSG_CONNECT
	HGCM_MSG_REGEXT
	SVC_MSG_HOSTCALL // when drag and drop occurs
src/VBox/HostServices/DragAndDrop/VBoxDragAndDropSvc.cpp:1071
	DragAndDropService::hostCall
src/VBox/Frontends/VirtualBox/src/main.cpp:939
src/VBox/Main/src-client/ConsoleImpl.cpp
	VMR3Create
src/VBox/HostServices/GuestProperties/VBoxGuestPropSvc.cpp
	Service::call
		GUEST_PROP_FN_GET_PROP
		GUEST_PROP_FN_SET_PROP
		GUEST_PROP_FN_SET_PROP_VALUE
		GUEST_PROP_FN_DEL_PROP
		GUEST_PROP_FN_ENUM_PROPS
		GUEST_PROP_FN_GET_NOTIFICATION