# This is mostly useful for tools; if you have changes to `compiler/` they will be ignored.
#
# You can set this to "if-unchanged" to only download if `compiler/` has not been modified.
-#
-# FIXME(#82739): currently, this also uses the downloaded compiler for stage0, but that causes unnecessary rebuilds.
#download-rustc = false
# Number of codegen units to use for each compiler invocation. A value of 0
# Use LLVM libunwind as the implementation for Rust's unwinder.
# Accepted values are 'in-tree' (formerly true), 'system' or 'no' (formerly false).
+# This option only applies for Linux and Fuchsia targets.
+# On Linux target, if crt-static is not enabled, 'no' means dynamic link to
+# `libgcc_s.so`, 'in-tree' means static link to the in-tree build of llvm libunwind
+# and 'system' means dynamic link to `libunwind.so`. If crt-static is enabled,
+# the behavior is depend on the libc. On musl target, 'no' and 'in-tree' both
+# means static link to the in-tree build of llvm libunwind, and 'system' means
+# static link to `libunwind.a` provided by system. Due to the limitation of glibc,
+# it must link to `libgcc_eh.a` to get a working output, and this option have no effect.
#llvm-libunwind = 'no'
# Enable Windows Control Flow Guard checks in the standard library.