| 28 Dec 2025 |
 flokli | huuurgh: https://github.com/aws/aws-lc-rs/blob/e0aa4187a8e00e2ec69dc4efb8a10a824863f586/aws-lc-sys/builder/main.rs#L492-L507 | 00:15:07 |
| flokli | https://github.com/NixOS/nixpkgs/pull/474675 | 00:23:12 |
 Randy Eckenrode | Next in my Swift work is a detour to make XCTest and Swift Testing work on Darwin, then I want to work on the stdlib. I’m probably done for tonight though. | 00:50:09 |
|  anton joined the room. | 08:53:51 |
 Ihar Hrachyshka | where does one define common CFLAGS / CPPFLAGS for darwin? | 23:17:43 |
| Ihar Hrachyshka | * where does one define common CFLAGS / CPPFLAGS for darwin? (for all nixpkgs) | 23:18:00 |
| Randy Eckenrode | Usually in the wrapper. What flags? | 23:21:52 |
| Ihar Hrachyshka | the ones for SET_FDSIZE increase | 23:52:09 |
| Ihar Hrachyshka | is it the wrapper postFixup? | 23:54:47 |
| 29 Dec 2025 |
| Ihar Hrachyshka | is it something like this? https://github.com/NixOS/nixpkgs/pull/474914 | 00:01:45 |
| Randy Eckenrode | That looks reasonable. | 00:28:13 |
 emily | can you explain "except the need to pass POSIX certification"? | 00:38:13 |
| Randy Eckenrode | POSIX requires that select return EINVAL when nfds is larger than SET_FDSIZE. | 00:39:37 |
| Ihar Hrachyshka | there's some more info in https://gitlab.gnome.org/GNOME/glib/-/merge_requests/4953
but basically "POSIX requires EINVAL if nfds >= FD_SETSIZE" | 00:39:45 |
| Randy Eckenrode | Which is 1024 AFAIK for historical reasons. | 00:40:02 |
| Randy Eckenrode | Darwin has a way to allow bigger sizes, but you have to opt into it. | 00:40:53 |
| emily | I'm not a fan of setting global compiler flags that diverge from the platform defaults and that can result in programs having hidden security vulnerabilities when compiled with standard flags. _DARWIN_UNLIMITED_SELECT especially is a kind of crazy hack | 00:41:10 |
| emily | programs that need/can handle such a definition should set the flags themselves in their own build systems | 00:41:28 |
| Randy Eckenrode | The only issue I can see with forcing a larger size for all packages is what happens when packages request their own size (e.g., a smaller one). | 00:42:00 |
| emily |
This will not resolve the issue of fds limited to 1024 per se but only
disable the fault trap in libSystem. To increase the number of fds
supported by select, one also has to increase FD_SETSIZE macro value
during compilation, making sure it's defined before select header is
included.
I believe the idea is actually that you pass a heap-allocated fd buffer instead
| 00:42:21 |
| emily | and then it checks whether it's on the stack or not | 00:42:34 |
