From: Palmer Dabbelt <palmer@rivosinc.com>
Date: Wed, 3 Jul 2024 01:20:39 +0000 (-0700)
Subject: RISC-V: Describe -march behavior for dependent extensions
X-Git-Tag: basepoints/gcc-16~7728
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=70f6bc39c4b0e147a816ad1dad583f944616c367;p=thirdparty%2Fgcc.git

RISC-V: Describe -march behavior for dependent extensions

gcc/ChangeLog:

	* doc/invoke.texi: Describe -march behavior for dependent extensions on
	RISC-V.
---

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