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Set LEAN_MAIN_USE_THREAD=0 env before main executes #59

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Merged
paulcadman merged 2 commits into from
Jun 2, 2026
Merged

Set LEAN_MAIN_USE_THREAD=0 env before main executes #59

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bc65298
Set LEAN_MAIN_USE_THREAD=0 env before main executes
paulcadman Apr 25, 2026
8877268
Bump lean-toolchain to v4.30.0 release
paulcadman Jun 2, 2026
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9 changes: 9 additions & 0 deletions c/raylib_bindings.c
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,15 @@
#include <string.h>
#include <stdlib.h>

// Lean 4.30.0+ runs `main` on a new thread but UI should run on the OS main
// thread (and this is mandatory on macOS), so opt out before `main` runs.
// https://github.com/leanprover/lean4/pull/12971
__attribute__((constructor))
static void raylean_force_main_thread(void) {
// set overwrite=0 so users may force the threaded behavior using the shell
setenv("LEAN_MAIN_USE_THREAD", "0", 0);
}

#define IO_UNIT (lean_io_result_mk_ok(lean_box(0)))

#ifdef RAYLEAN_NO_BUNDLE
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5 changes: 3 additions & 2 deletions lake-manifest.json
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@@ -1,4 +1,4 @@
{"version": "1.1.0",
{"version": "1.2.0",
"packagesDir": ".lake/packages",
"packages":
[{"url": "https://github.com/funexists/lens-demo.git",
Expand All @@ -22,4 +22,5 @@
"inherited": false,
"configFile": "lakefile.toml"}],
"name": "raylean",
"lakeDir": ".lake"}
"lakeDir": ".lake",
"fixedToolchain": false}
2 changes: 1 addition & 1 deletion lean-toolchain
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@@ -1 +1 @@
leanprover/lean4:v4.28.0
leanprover/lean4:v4.30.0
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