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-rw-r--r--Documentation/kbuild/kbuild.rst11
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/kbuild/kbuild.rst b/Documentation/kbuild/kbuild.rst
index 17c9f920f03d..3388a10f2dcc 100644
--- a/Documentation/kbuild/kbuild.rst
+++ b/Documentation/kbuild/kbuild.rst
@@ -91,6 +91,17 @@ HOSTRUSTFLAGS
-------------
Additional flags to be passed to $(HOSTRUSTC) when building host programs.
+PROCMACROLDFLAGS
+----------------
+Flags to be passed when linking Rust proc macros. Since proc macros are loaded
+by rustc at build time, they must be linked in a way that is compatible with
+the rustc toolchain being used.
+
+For instance, it can be useful when rustc uses a different C library than
+the one the user wants to use for host programs.
+
+If unset, it defaults to the flags passed when linking host programs.
+
HOSTLDFLAGS
-----------
Additional flags to be passed when linking host programs.