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by swampdog
Sat May 04, 2019 12:05 pm
Forum: General discussion
Topic: Install Qt5 On Raspberry Pi2
Replies: 21
Views: 38332

Re: Install Qt5 On Raspberry Pi2

@Heater

Unfortunately no. It's proprietary. A previous employer sold my code. It ended up in the hands of a US antivirus company of which I cannot speak due to an NDA.

I haven't got round to rewriting it.
by swampdog
Sat May 04, 2019 9:01 am
Forum: C/C++
Topic: Creating a Raspberry Pi program in Qt Creator
Replies: 28
Views: 6468

Re: Creating a Raspberry Pi program in Qt Creator

Has someone got 2G of public space?

I have a debug build of QT 5.12.1. QtCreator 4.8.1.
by swampdog
Sat May 04, 2019 8:35 am
Forum: General discussion
Topic: Install Qt5 On Raspberry Pi2
Replies: 21
Views: 38332

Re: Install Qt5 On Raspberry Pi2

It's "do-able". I have QT 5.12.1 built and QtCreator 4.8.1. Works fine.
by swampdog
Tue Apr 30, 2019 9:12 pm
Forum: Beginners
Topic: Deleting 'pi' user
Replies: 8
Views: 4149

Re: Deleting 'pi' user

Fwiw, I just 'sudo passwd -l pi' (lock) the "pi" user account.
by swampdog
Wed Apr 24, 2019 5:14 pm
Forum: C/C++
Topic: GCC 6 Cross Compiler
Replies: 16
Views: 7057

Re: GCC 6 Cross Compiler

@AdamStanislav

If you can provide details of a public server, I'll upload it there.

Unfortunately for all of us, I do intend to create one/both of github/website but my time isn't my own so any new tasks have to wait.
by swampdog
Wed Apr 24, 2019 2:47 am
Forum: C/C++
Topic: GCC 6 Cross Compiler
Replies: 16
Views: 7057

Re: GCC 6 Cross Compiler

@leoPosh

Emailed. Expect three emails. "xaa" "xab" and the third (normal) one with details with subject same as this thread.
by swampdog
Sat Apr 20, 2019 8:39 pm
Forum: C/C++
Topic: Missing sharing libraries
Replies: 3
Views: 1329

Re: Missing sharing libraries

$ apt-file search /opt/vc/lib/libGLESv2.so libraspberrypi0: /opt/vc/lib/libGLESv2.so $ apt-file search /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 libgles2-mesa: /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 ^^^ The files are different on my rpi. Hint for figuring it out.. sudo apt-get instal...
by swampdog
Sat Apr 20, 2019 7:55 pm
Forum: C/C++
Topic: GCC 6 Cross Compiler
Replies: 16
Views: 7057

Re: GCC 6 Cross Compiler

@leoPosh. Sure it's a 46Mb tarball. Do you have details where I can post it?
by swampdog
Fri Apr 12, 2019 2:38 am
Forum: Troubleshooting
Topic: Raspberry Pi 3 B+ experiencing tons of kernel oops when compiling over NFS
Replies: 8
Views: 806

Re: Raspberry Pi 3 B+ experiencing tons of kernel oops when compiling over NFS

My memory may not be correct on this but I *think* I had this problem ages ago. In case it helps.. admin@pi05:~ $ dfh 192.168.1.20:/mnt/nfsd/pi05 63G 45G 16G 75% / mmcblk0p1 43M 22M 21M 52% /boot mmcblk0p2 3.6G 3.1G 382M 89% /swap admin@pi05:~/usr/src/gcc $ lc -h /swap/dphys -rw------- 1 root root 1...
by swampdog
Thu Apr 11, 2019 12:28 am
Forum: Beginners
Topic: [SOLVED] Trouble configuring Raspbian Lite for pubkey auth SSH with PUTTY (Windows) generated key
Replies: 9
Views: 685

Re: Trouble configuring Raspbian Lite for pubkey auth SSH with PUTTY (Windows) generated key

I've had no end of wierd problems with PuTTY over the years. If you are able you'll find it much less painful to install cygwin and its "ssh client". Just run 'ssh-user-config'. Thereafter it's just like linux. Here's how to manually set up ssh on your rpi. We'll create a throwaway account. $sudo su...
by swampdog
Wed Apr 10, 2019 11:23 pm
Forum: C/C++
Topic: std::thread not working with clang in rpi3
Replies: 3
Views: 521

Re: std::thread not working with clang in rpi3

I don't know much about clang. However, I needed to build LLVM and built clang (6.01) as most of the work was done. Mine isn't "installed" properly and thus requires LD_LIBRARY_CONFIG which *might* help with your problem. I also have multiple "gcc" versions and for this I used gcc (8.2.0) and they a...
by swampdog
Thu Apr 04, 2019 7:44 pm
Forum: Raspbian
Topic: What is the small partition visible to Windows?
Replies: 25
Views: 2109

Re: What is the small partition visible to Windows?

Are you able to give some insight into the complex reasons? Maybe i should explain what I’m trying to do. Using Raspbian (Stretch, or whatever is the current version), Volumio, or perhaps another music player oriented op system, I’m building a dedicated music player like an iPod. All this device ne...
by swampdog
Thu Apr 04, 2019 4:33 pm
Forum: Raspbian
Topic: What is the small partition visible to Windows?
Replies: 25
Views: 2109

Re: What is the small partition visible to Windows?

Windows can't natively see most of the sdcard. The small bit that windows can see is used to boot raspbian. The rest of the sdcard is raspbian itself and uses a linux filesystem (ext4). Windows has a nasty habit of stomping over filesystems it doesn't recognise so for the time being just assume the ...
by swampdog
Thu Apr 04, 2019 4:18 pm
Forum: C/C++
Topic: missing X libraries
Replies: 2
Views: 1601

Re: missing X libraries

A couple of useful tools when coding.. $sudo apt-get install mlocate apt-file The first allows you to "sudo updatedb" then "man locate" to find files present on your system. The latter "sudo apt-file update" (do it after an "apt-get update") updates a database of every file in every package. eg: $ a...
by swampdog
Thu Apr 04, 2019 3:48 pm
Forum: C/C++
Topic: C/C++ Memory Usage Code
Replies: 25
Views: 4884

Re: C/C++ Memory Usage Code

I simply googled and went from this.. https://stackoverflow.com/questions/19949283/seek0-on-linux-proc-sys-pseudo-files ..rather than personal knowledge of how the kernel acts in that respect. However, as you're into overly excessive optimisation ;-) It "works" on my rpi so it's fair game. It's poss...
by swampdog
Wed Apr 03, 2019 3:54 pm
Forum: C/C++
Topic: why does this error occurs?
Replies: 5
Views: 1870

Re: why does this error occurs?

This is probably where you're going to have to work it out for yourself. Add "-g" (debug flag). Example of a segfault.. $cat core.c #include <stdio.h> int main() {char *p=NULL; printf("Beg\n"); printf("%s\n",p); printf("End\n"); return 0; } Now we'll enable coredumps for this login and add debug inf...
by swampdog
Mon Apr 01, 2019 7:55 pm
Forum: C/C++
Topic: Help with "typedef statements for ARMV6 (32bit) CPU
Replies: 28
Views: 3687

Re: Help with "typedef statements for ARMV6 (32bit) CPU

Not that it "matters" for the project because you need to compile it "as-is" but fwiw, generically the idiom is.. int ch; while (EOF != (ch = fgetc(fp))) { /* stuff */ } /* ferror/clearerr */ That is, you must test for EOF before doing anything else. Perhaps the logic of the code does not require it...
by swampdog
Mon Apr 01, 2019 7:22 pm
Forum: C/C++
Topic: [SOLVED] Stripping a library?
Replies: 9
Views: 2092

Re: [SOLVED] Stripping a library?

As an addendum you likely don't need to bother doing this yourself "man 1 install" noting the "-s" option.
by swampdog
Mon Apr 01, 2019 7:14 pm
Forum: C/C++
Topic: why does this error occurs?
Replies: 5
Views: 1870

Re: why does this error occurs?

You can get the compiler errors into a text file thus.. $ gcc -lm -o final final.c >z 2>&1 $ cat z ..saves having to take screenshots and attachments. $ apt-cache search wiring | grep ^w wiringpi - The wiringPi libraries, headers and gpio command ^^^ you probably haven't got this installed. $ sudo a...
by swampdog
Mon Apr 01, 2019 5:02 pm
Forum: C/C++
Topic: C/C++ Memory Usage Code
Replies: 25
Views: 4884

Re: C/C++ Memory Usage Code

You could use fseek(file,0,SEEK_SET) rather than keep reopening the file and "/1024" is the same as ">> 10" though it wouldn't surprise me if gcc worked out the latter for itself.

Yeah. I'm an erratic poster!
by swampdog
Sat Mar 16, 2019 12:22 am
Forum: C/C++
Topic: How to assign a variable value from a text file
Replies: 6
Views: 2026

Re: How to assign a variable value from a text file

We need an example. In lieu of that.. admin@pi05:~ $ apropos strto strtod (3) - convert ASCII string to floating-point number strtof (3) - convert ASCII string to floating-point number strtoimax (3) - convert string to integer strtok (3) - extract tokens from strings strtok_r (3) - extract tokens fr...
by swampdog
Thu Mar 14, 2019 11:56 pm
Forum: Raspbian
Topic: Webmin or an alternative
Replies: 10
Views: 2270

Re: Webmin or an alternative

Looks like I failed to make a note of the procedure Ah. Looks like it's still in the history of my "printer" rpi.. $ sudo dpkg -i webmin_1.831_all.deb $ sudo systemctl status webmin $ wget wget http://www.webmin.com/jcameron-key.asc $ sudo apt-key add jcameron-key.asc $sudo apt-get update $sudo apt...
by swampdog
Thu Mar 14, 2019 11:41 pm
Forum: Raspbian
Topic: Webmin or an alternative
Replies: 10
Views: 2270

Re: Webmin or an alternative

I've got "sarge" webmin running under jessie just fine and it will update. admin@pi07:~ $ cat /etc/apt/sources.list | grep webm deb http://download.webmin.com/download/repository sarge contrib Looks like I failed to make a note of the procedure but if you google how to install it for debian you'll l...
by swampdog
Thu Mar 14, 2019 2:32 am
Forum: Advanced users
Topic: What is the latest MySQL on Pi?
Replies: 7
Views: 852

Re: What is the latest MySQL on Pi?

This idea may not be suitable for your needs: you could install a virtual machine on your PC with an older version of mysql workbench running in it.

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