| 28 May 2025 |
 maralorn | sterni: When I want GHC to set a flag when calling cc during a compilation. Is there an environment variable I can set in my Haskell package derivation? Or is it correct that I can only set that variable during compilation of GHC via CONF_CC_OPTS_STAGE2. It seems kinda fishy to me because I basically only want to affect runtime behavior of the compiler. | 15:43:27 |
 Alex | In reply to @sternenseemann:systemli.org
I think armv7l is de facto dead as well, but nixpkgs CI checks eval of it?? Probably more GHC availability checks need to be added before we can drop support. You could try asking in #exotic:nixos.org. | 15:48:51 |
 chreekat | In reply to @maralorn:maralorn.de
sterni: When I want GHC to set a flag when calling cc during a compilation. Is there an environment variable I can set in my Haskell package derivation? Or is it correct that I can only set that variable during compilation of GHC via CONF_CC_OPTS_STAGE2. It seems kinda fishy to me because I basically only want to affect runtime behavior of the compiler. I see a -optc and a -optlc (for llvm... Not sure why there's two) on GHC directly , but maybe you're asking about a different level of the stack | 16:44:04 |
| chreekat | https://downloads.haskell.org/ghc/latest/docs/users_guide/phases.html#ghc-flag-optc-option | 16:44:15 |
 Artem | In reply to @maralorn:maralorn.de
sterni: When I want GHC to set a flag when calling cc during a compilation. Is there an environment variable I can set in my Haskell package derivation? Or is it correct that I can only set that variable during compilation of GHC via CONF_CC_OPTS_STAGE2. It seems kinda fishy to me because I basically only want to affect runtime behavior of the compiler. I don't believe it can be done with env vars | 17:38:26 |
| Artem | I think it's only the flags that @b:chreekat.net: mentioned | 17:39:45 |
| Alex | In reply to @maralorn:maralorn.de
sterni: When I want GHC to set a flag when calling cc during a compilation. Is there an environment variable I can set in my Haskell package derivation? Or is it correct that I can only set that variable during compilation of GHC via CONF_CC_OPTS_STAGE2. It seems kinda fishy to me because I basically only want to affect runtime behavior of the compiler. Aren't you assuming that GHC calls cc?
It doesn't unless you're compiling C code or you have an unregisterised GHC.
Nixpkgs' cc-wrapper may allow you to add extra options via an environment variable.
I cannot recall what environment variables it reads. | 17:41:18 |
| maralorn | I think I figured it out. | 17:58:41 |
| maralorn | And yes ghc calls cc. For c code and for linking. | 17:58:41 |
| maralorn | Well I guess -optlc might actually do what I want also. | 18:19:06 |
 sterni (he/him) | -optc and friends is right yes | 18:54:28 |
| Alex | Doesn't it call ld for linking? | 19:22:42 |
| maralorn | Well, at least not for the js backend. There emscripten is used for linking iiuc. | 21:34:09 |
