why the qb64 editor is slow under linux

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#!/bin/bash

# QB64 Installer

# Argument 1: If not blank, qb64 will not be started after compilation



dont_run="$1"



#This checks the currently installed packages for the one's QB64 needs

#And runs the package manager to install them if that is the case

# *** SECTION ENLEVE ***





#Make sure we're not running as root

if [ $EUID == "0" ]; then

  echo "You are trying to run this script as root. This is highly unrecommended."

  echo "This script will prompt you for your sudo password if needed to install packages."

  exit 1

fi



GET_WGET=

#Path to Icon

#Relative Path to icon -- Don't include beginning or trailing '/'

QB64_ICON_PATH="internal/source"



#Name of the Icon picture

QB64_ICON_NAME="qb64icon32.png"



DISTRO=



lsb_command=`which lsb_release 2> /dev/null`

if [ -z "$lsb_command" ]; then

  lsb_command=`which lsb_release 2> /dev/null`

fi



#Outputs from lsb_command:



#Arch Linux  = arch

#Debian      = debian

#Fedora      = Fedora

#KUbuntu     = ubuntu

#LUbuntu     = ubuntu

#Linux Mint  = linuxmint

#Ubuntu      = ubuntu

#Slackware   = slackware

#VoidLinux   = voidlinux

#XUbuntu     = ubuntu

#Zorin       = Zorin

if [ -n "$lsb_command" ]; then

  DISTRO=`$lsb_command -si | tr '[:upper:]' '[:lower:]'`

elif [ -e /etc/arch-release ]; then

  DISTRO=arch

elif [ -e /etc/debian_version ] || [ -e /etc/debian_release ]; then

  DISTRO=debian

elif [ -e /etc/fedora-release ]; then

  DISTRO=fedora

elif [ -e /etc/redhat-release ]; then

  DISTRO=redhat

elif [ -e /etc/centos-release ]; then

  DISTRO=centos

fi



#Find and install packages

# *** SECTION ENLEVE ***



echo "Compiling and installing QB64..."



### Build process

find . -name "*.sh" -exec chmod +x {} \;

find internal/c/parts -type f -iname "*.a" -exec rm -f {} \;

find internal/c/parts -type f -iname "*.o" -exec rm -f {} \;

find internal/c/libqb -type f -iname "*.o" -exec rm -f {} \;

rm ./internal/temp/*



echo "Modification 'makeline*'"

cp ./internal/c/makeline_lnx.txt ./internal/c/makeline_lnx_ORG.txt

find ./internal/c -type f -name "makeline_lnx.txt" -print0 | xargs -0 sed -i 's/g++ -no-pie -w qbx.cpp/g++ -O3 -no-pie -w qbx.cpp/g'

cp ./internal/c/makeline_lnx_nogui.txt ./internal/c/makeline_lnx_nogui_ORG.txt

find ./internal/c -type f -name "makeline_lnx_nogui.txt" -print0 | xargs -0 sed -i 's/g++ -no-pie -w qbx.cpp/g++ -O3 -no-pie -w qbx.cpp/g'



echo "Building library 'LibQB'"

pushd internal/c/libqb/os/lnx >/dev/null

rm -f libqb_setup.o

cp setup_build.sh setup_build_ORG.sh

cp build_test.sh build_test_ORG.sh

find . -type f -name "*.sh" -print0 | xargs -0 sed -i 's/g++ -c -w -Wall/g++ -O3 -c -w -Wall/g'

./setup_build.sh

popd >/dev/null



echo "Building library 'FreeType'"

pushd internal/c/parts/video/font/ttf/os/lnx >/dev/null

rm -f src.o

cp setup_build.sh setup_build_ORG.sh

cp build.sh build.sh_ORG.sh

find . -type f -name "*.sh" -print0 | xargs -0 sed -i 's/g++ -s -c -w -Wall/g++ -s -O3 -c -w -Wall/g'

./setup_build.sh

popd >/dev/null



echo "Building library 'Core:FreeGLUT'"

pushd internal/c/parts/core/os/lnx >/dev/null

rm -f src.a

cp setup_build.sh setup_build_ORG.sh

cp build.sh build.sh_ORG.sh

find . -type f -name "*.sh" -print0 | xargs -0 sed -i 's/gcc -s -O2 -c/gcc -s -O3 -c/g'

./setup_build.sh

popd >/dev/null



echo "Building 'QB64'"

tar -czvf ./internal/source/main.tar.gz ./internal/source/main.txt

find ./internal/source -type f -name "main.txt" -print0 | xargs -0 sed -i 's/g++ -c -s -w -Wall libqb.cpp -D FREEGLUT_STATIC/g++ -O3 -c -s -w -Wall libqb.cpp -D FREEGLUT_STATIC/g'

cp -r ./internal/source/* ./internal/temp/

pushd internal/c >/dev/null

g++ -O3 -no-pie -w qbx.cpp libqb/os/lnx/libqb_setup.o parts/video/font/ttf/os/lnx/src.o parts/core/os/lnx/src.a -lGL -lGLU -lX11 -lpthread -ldl -lrt -D FREEGLUT_STATIC -o ../../qb64

popd



if [ -e "./qb64" ]; then

  echo "DISTRO: $DISTRO"

  echo "Done compiling!!"

  echo

  echo "QB64 is located in this folder:"

  echo "`pwd`"

else

  ### QB64 didn't compile

  echo "It appears that the qb64 executable file was not created, this is usually an indication of a compile failure (You probably saw lots of error messages pop up on the screen)"

  echo "Usually these are due to missing packages needed for compilation. If you're not running a distro supported by this compiler, please note you will need to install the packages listed above."

  echo "If you need help, please feel free to post on the QB64 Forums detailing what happened and what distro you are using."

  echo "Also, please tell them the exact contents of this next line:"

  echo "DISTRO: $DISTRO"

fi

echo

echo "Thank you for using the QB64 installer."