From 70f6bc39c4b0e147a816ad1dad583f944616c367 Mon Sep 17 00:00:00 2001
From: Palmer Dabbelt <palmer@rivosinc.com>
Date: Tue, 2 Jul 2024 18:20:39 -0700
Subject: RISC-V: Describe -march behavior for dependent extensions

gcc/ChangeLog:

	* doc/invoke.texi: Describe -march behavior for dependent extensions on
	RISC-V.
---
 gcc/doc/invoke.texi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 68ebd79d676..b37c7af7a39 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -31063,6 +31063,10 @@ If both @option{-march} and @option{-mcpu=} are not specified, the default for
 this argument is system dependent, users who want a specific architecture
 extensions should specify one explicitly.
 
+When the RISC-V specifications define an extension as depending on other
+extensions, GCC will implicitly add the dependent extensions to the enabled
+extension set if they weren't added explicitly.
+
 @opindex mcpu
 @item -mcpu=@var{processor-string}
 Use architecture of and optimize the output for the given processor, specified
-- 
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