| --- Log opened Thu Jul 13 00:00:20 2017 |
| 00:19 | <&ToxicFrog> | Not declared vs. not defined |
| 00:22 | <&McMartin> | Yyyyup |
| 00:22 | | * McMartin got burned last night by some kind of crazy system-specific "weak linking" thing |
| 00:22 | <&McMartin> | Where the system headers declared it but you had to define it yourself to control the behavior of fopen() et al |
| 00:23 | | * McMartin solved that by noping the fuck out of it. |
| 00:27 | <~Vornicus> | what the silliness is that |
| 00:28 | <&McMartin> | Part of the OS support in RISC OS involves routines that translate pathnames from the RISC OS crazypants format to something that looks enough like a UNIX path that it can interoperate with URLs or not break C programs written by anyone else in the universe |
| 00:28 | <&McMartin> | But sometimes you want to turn that off because, say, you are reading a pathname in from the OS and don't want to mangle it because it's already fine |
| 00:28 | <&McMartin> | There's a flag variable you can set but apparently it doesn't exist by default. |
| 00:28 | <&McMartin> | I decided to instead just mangle it twice. |
| 00:30 | <&McMartin> | (By calling __unixify() on it and then passing the result to fopen()) |
| 00:31 | <&McMartin> | I do know how that works in C, but I have no idea how they implemented the library to see if *the binary they were linked into* had this variable defined |
| 00:33 | <&McMartin> | Having asked that and done some quick googling, the answer appears to be "ELF has some handwavy basic support for marking symbols as weak, but interpreting that is up to the OS" |
| 00:49 | < Jessikat> | <McMartin> Where the system headers declared it but you had to define it yourself to control the behavior of fopen() et al <--- we had some code like that in one of our game libraries. I burned it to ash and salted the ground it stood upon |
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| 00:52 | <&ToxicFrog> | I've run into that in some of the arduino libraries. |
| 00:53 | <&ToxicFrog> | It's used for "we define a default empty implementation of this function but if you want to e.g. hook into serial initialization define it yourself and your version will get called" |
| 01:05 | <&McMartin> | Yeah, I can see this for functions |
| 01:05 | <&McMartin> | This was, um |
| 01:05 | <&McMartin> | this was an int |
| 01:06 | <&ToxicFrog> | my word |
| 01:07 | <&McMartin> | I don't actually know how you signal "this integer was never defined" |
| 01:07 | <&McMartin> | With weak-linked functions that aren't implemented, the ELF loader makes it look like the symbol exists, but interpreting it as a void * results in NULL |
| 01:08 | <&McMartin> | Maybe you take its address? |
| 01:08 | <&McMartin> | (Both of these are the "no default" condition, unlike your Arduino example) |
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| 21:02 | <&[R]> | Holy fuck Windows |
| 21:02 | <&[R]> | The only way you could have an even more useless "group by date" feature is if you did it by seconds. |
| 21:03 | <&[R]> | Treating 2017-06-27 19:04 and 2017-06-27 19:05 as different "dates" is annoying |
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| --- Log closed Fri Jul 14 00:00:22 2017 |