Pass -fno-sanitize-trap=undefined in debug mode

This should undo the effect of `-fsanitize-trap` that zig cc is passing internally. See ziglang/zig#5163 (comment)
avdv · May 6, 2024 · 13e129b · 13e129b
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commit 13e129b
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diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
@@ -112,7 +112,7 @@ jobs:
     - name: Cross Compile
       run: nix develop --ignore-environment --keep HOME --keep SCALANATIVE_MODE --command '.github/crosscompile'
       env:
-        SCALANATIVE_MODE: ${{ github.ref == 'refs/heads/main' && 'release-full' || 'release-fast' }}
+        SCALANATIVE_MODE: ${{ github.ref == 'refs/heads/main' && 'release-full' || 'debug' }}
     - name: qemu-aarch64 scalals
       run: nix shell 'nixpkgs#qemu' --command qemu-aarch64 scalals-out-linux-aarch64
     - uses: actions/upload-artifact@v4

diff --git a/project/Ninja.scala b/project/Ninja.scala
@@ -282,7 +282,8 @@ object Ninja extends AutoPlugin {
 
   private def opt(config: Config): Seq[String] =
     config.mode match {
-      case Mode.Debug       => List("-O0")
+      // disable trap mode for UB sanitizer in debug mode
+      case Mode.Debug       => List("-O0", "-fno-sanitize-trap=undefined")
       case Mode.ReleaseFast => List("-O2", "-Xclang", "-O2")
       case Mode.ReleaseFull => List("-O3", "-Xclang", "-Ofast")
       case Mode.ReleaseSize => List("-Os", "-Xclang", "-Oz")