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#rockbox log for 2018-11-08

00:25:19BilgusParkerR, I know what is doing it and I know what solves it but I don't know the underlying reason for it http://gerrit.rockbox.org/r/#/c/1975/
00:26:34ParkerRBilgus, So that affects the swap defines too?
00:27:34BilgusOh no sorry
00:27:49Bilgusyou gotta be specific :p
00:28:49Bilgusthat issue has to be an arch linux problem since no one else seems to be having the issue
00:29:46ParkerRYeah if you check my reply just now, it built in debian chroot
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00:44:32BilgusParkerR what device are you trying to build a sim for?
00:44:57ParkerR65 Clip Zip
00:53:15Bilgustry adding #define __ENDIAN_H_NATIVE_RB to autoconf.h in your build directory and see if we can just not use them
00:54:04Bilgusor we can add some swap functions in or just look for what arch linux provides
00:58:05Bilgusso if that doesn't work switch #define __ENDIAN_H_NATIVE_RB to #define __NEED_GENERIC_BYTESWAPS
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01:00:15atsampsonBilgus: it looks like that code can still call memchr(s, '\0', (unsigned)-1) if precision < 0 to start with - would it be better to change the ?: line?
01:01:47atsampsoni.e. make it "size_t len = precision >= 0 ? precision : 0;", then you don't need the "else if" branch
01:04:35Bilgusyou still have to search for the null char when precision isn't defined
01:06:05BilgusI don't think there is any way around it but this will at least stop it from dumping the whole memory contents if it doesn't find a null char.
01:06:14atsampsonoh, yuck, I see what you mean...
01:06:35BilgusAlbeit unlikely but I just saw it in the form of a 64 mb config.cfg file
01:09:02BilgusI have a feeling that there probably is another explanation as to why rbversion[] is causing it to happen but I looked at it for a few hours and even the ASM and see no reason why memchr couldn't find a NULL
01:15:54atsampsondoes rbversion have an unusual address, since it's a constant? (near the end of memory or something?)
01:17:08atsampsonit's maybe an interesting question of interpretation whether memchr(s, c, -1) is undefined behaviour or not - C11 says it shouldn't be provided c is actually found, but I could imagine some compiler not doing the wraparound check correctly in that case...
01:18:28atsampsonhttp://www.open-std.org/jtc1/sc22/wg14/www/docs/n1533.htm
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01:19:51ParkerRBilgus, Well that got somewhere (but ended with undefined) http://ix.io/1ovD
01:20:24ParkerRBilgus, Where would I dig to see where Arch provides this?
01:20:39Bilgus80d7bbc it doesn't appear to be..
01:21:18ParkerR#define __NEED_GENERIC_BYTESWAPS is the same as starting with
01:23:03Bilgusatsampson, you might be on to something there it could also be that there is an issue with num(size_t)
01:23:46Bilgus.. being so large maybe I should look at what it uses within the function
01:26:24ParkerRI even tried compiling with an older gcc6 and it still threw the errors (gcc 6 is what the debia chroot was using)
01:26:34ParkerR*debian
01:34:14ParkerRBilgus, Ill be damned
01:35:29BilgusParkerR without having it in front of me I'm next to useless to tell you where to look.. try find / -name byteswap.h or even grep -rnw '/' -e 'swap16'
01:35:40BilgusDid you figure it out?
01:35:43ParkerR/home/parker/build/rockbox/firmware/include/rbendian.h around line 100 I commented everything to force it to use the first block and it worked http://ix.io/1rhd
01:36:58Bilgusthat shold have been the same as #define __ENDIAN_H_NATIVE_RB
01:37:08ParkerRSomehow it wasnt
01:37:09ParkerRWeird
01:37:49BilgusWell alls well that ends well :p
01:37:54ParkerRHeh
01:38:51ParkerRhttps://i.imgur.com/W5s66PK.png
01:41:16BilgusCool!
01:42:57Bilgusatsampson, I'll try strchr and see if it works if so maybe I'll switch it to use strchr if precision is -1 and memchr otherwise although I'm not overly happy with that
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16:01:34Bilgusatsampson, it ended up being -1 for count on memcpy causing it, thanks.
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