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by swampdog
Thu Jun 06, 2019 1:20 am
Forum: General discussion
Topic: script problem (again) - scratching my head...
Replies: 9
Views: 572

Re: script problem (again) - scratching my head...

#!/bin/bash ^^^ no ! (bang) in yours. if [ -z "$2" ]; then kodiflag="$2" ^^^if nul then set nul? I tend to use the same basic template.. #!/bin/bash NAM=`basename "$0"` fcp_usage () { cat<<EOF ${NAM}: [ --help | -h ] ${NAM}: [ start | 1 ] ${NAM}: [ stop | 0 ] ${NAM}: [ foo ] [arg1] [arg2] EOF } fcp_...
by swampdog
Thu Jun 06, 2019 12:02 am
Forum: C/C++
Topic: avoid compile warnings about ISO C++ forbids converting a string constant to ‘char*’
Replies: 24
Views: 3362

Re: avoid compile warnings about ISO C++ forbids converting a string constant to ‘char*’

Appearently I cannot have both ways optionally, arbitrarily, simultaneously. It's because you're inadvertently attempting to remove the "constness". Back in the bad of days of K&R compilers what you are attempting was perfectly possible and the source of maddening bugs. I could write this.. "token"...
by swampdog
Sat May 11, 2019 7:07 pm
Forum: Raspbian
Topic: tar destroys directories
Replies: 5
Views: 417

Re: tar destroys directories

oops! Realised I forgot to add something then hit [submit].(*) $sudo -i tar --no-same-owner --no-same-permissions -C / sdl-raspberrypi-3085.tar.xz ..might do the job (so long since I've used them but I suspect 'sudo -i' is important for the umask etc) but this is likely better off done via "sudo su ...
by swampdog
Sat May 11, 2019 6:41 pm
Forum: Raspbian
Topic: tar destroys directories
Replies: 5
Views: 417

Re: tar destroys directories

UNIX/Linux noob of over 30 years!!! But I'm really new to Raspbian! So how does this happen. ..because you're a very naughty veteran linux noob! $ tar --numeric-owner -tvJf /wrk/sdl-raspberrypi-3085.tar.xz |head drwx------ 126/133 0 2019-04-25 22:18 usr/ drwx------ 126/133 0 2019-04-25 22:18 usr/lo...
by swampdog
Sat May 04, 2019 12:05 pm
Forum: General discussion
Topic: Install Qt5 On Raspberry Pi2
Replies: 21
Views: 37387

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: 3552

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: 37387

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: 3990

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: 5604

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: 5604

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: 1041

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: 5604

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: 716

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.. [email protected]:~ $ 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 [email protected]:~/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: 486

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: 456

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: 1853

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: 1853

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: 1515

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: 4079

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: 1756

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: 3361

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: 1939

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: 1756

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: 4079

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!

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