Changes between Version 6 and Version 7 of mycroft_mark-2_gui_qt5.11

Timestamp:

04/15/20 20:16:37 (4 years ago)

Author:

admin

Comment:

--

mycroft_mark-2_gui_qt5.11

@@ -1 +1 @@
 == Mycroft Mark II - GUI using Qt 5.12 LTS ==
+
+=== Building with distcc ===
+The Pi is not the fastest machine and it has limited memory so one can not build for example qtwebengine locally.
+To use distcc (I have a cluster of 3 gentoo servers for that) I installed a proper toolchain on the hosts using gentoos crossdev with the proper versions for the raspian buster:
+* crossdev --g 8.3.0-r1 --l 2.28-r6 -t arm-linux-gnueabihf
+I could not really make distcc work in a "regular" way so I used the good old wrapper method:
+* cd /usr/lib/distcc
+* sudo mkdir bin
+* cd bin
+* sudo nano arm-linux-gnueabihf-wrapper
+{{{
+#!/bin/bash
+exec /usr/lib/distcc/bin/arm-linux-gnueabihf-g${0:$[-2]} "$@"
+}
+* sudo chmod a+x arm-linux-gnueabihf-wrapper
+* sudo ln -s arm-linux-gnueabihf-wrapper c++
+* sudo ln -s arm-linux-gnueabihf-wrapper cc
+* sudo ln -s arm-linux-gnueabihf-wrapper g++
+* sudo ln -s arm-linux-gnueabihf-wrapper gcc
+* sudo ln -s ../../../bin/distcc arm-linux-gnueabihf-g++
+* sudo ln -s ../../../bin/distcc arm-linux-gnueabihf-g++-8
+* sudo ln -s ../../../bin/distcc arm-linux-gnueabihf-gcc
+* sudo ln -s ../../../bin/distcc arm-linux-gnueabihf-gcc-8
+* sudo ls -la
+should look like that:
+{{{
+drwxr-xr-x 2 root root 4096 Apr 15 21:03 .
+drwxr-xr-x 3 root root 4096 Apr 14 22:05 ..
+lrwxrwxrwx 1 root root   19 Apr 14 22:12 arm-linux-gnueabihf-g++ -> ../../../bin/distcc
+lrwxrwxrwx 1 root root   19 Apr 14 22:12 arm-linux-gnueabihf-g++-8 -> ../../../bin/distcc
+lrwxrwxrwx 1 root root   19 Apr 14 22:12 arm-linux-gnueabihf-gcc -> ../../../bin/distcc
+lrwxrwxrwx 1 root root   19 Apr 14 22:12 arm-linux-gnueabihf-gcc-8 -> ../../../bin/distcc
+-rwxr-xr-x 1 root root   74 Apr 14 22:09 arm-linux-gnueabihf-wrapper
+lrwxrwxrwx 1 root root   27 Apr 14 22:13 c++ -> arm-linux-gnueabihf-wrapper
+lrwxrwxrwx 1 root root   27 Apr 14 22:13 cc -> arm-linux-gnueabihf-wrapper
+lrwxrwxrwx 1 root root   27 Apr 14 22:13 g++ -> arm-linux-gnueabihf-wrapper
+lrwxrwxrwx 1 root root   27 Apr 14 22:13 gcc -> arm-linux-gnueabihf-wrapper
+}}}
+to use distcc to build just set $PATH so that it contains /usr/lib/distcc/bin first:
+* export PATH=/usr/lib/distcc/bin:$PATH
+add the build-host to the /etc/distcc/hosts 
+* nano /etc/distcc/hosts
+{{{
+# Add a list of hostnames in one line, seperated by spaces, here.
+192.168.14.70 192.168.14.5
+}}}
+then just call gcc or make.
+==== test that distcc works ====
+* cd ~
+* mkdir distcc_test
+* cd distcc_test
+* nano main.c
+with the content:
+{{{
+#include <stdio.h>
+ 
+int main() {
+    printf("Hello distcc!\n");
+    return 0;
+}
+set distcc messages to verbose:
+* export DISTCC_VERBOSE=1
+make sure that you have /usr/lib/distcc/bin in the begining of the PATH (see above)
+* gcc -c main.c -o main.o
+you should see a lot of messages from distcc (look for something like 
+}}}
 
 === Build QT 5.12 LTS for eglfs ===