From: Palmer Dabbelt <palmer@rivosinc.com>
Date: Tue, 20 Feb 2024 15:45:38 +0000 (-0800)
Subject: doc: RISC-V: Document that -mcpu doesn't override -march or -mtune
X-Git-Tag: basepoints/gcc-15~996
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1c5da882bf77400748aeb0b01bf9a7faba1a4f32;p=thirdparty%2Fgcc.git

doc: RISC-V: Document that -mcpu doesn't override -march or -mtune

This came up recently as Edwin was looking through the test suite.  A
few of us were talking about this during the patchwork meeting and were
surprised.  Looks like this is the desired behavior, so let's at least
document it.

gcc/ChangeLog:

	* doc/invoke.texi: Document -mcpu.

Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
---

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 58527e1ea3c5..4f4ca2b76720 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -30750,6 +30750,8 @@ Permissible values for this option are: @samp{sifive-e20}, @samp{sifive-e21},
 @samp{sifive-u54}, @samp{sifive-u74}, @samp{sifive-x280}, @samp{sifive-xp450},
 @samp{sifive-x670}.
 
+Note that @option{-mcpu} does not override @option{-march} or @option{-mtune}.
+
 @opindex mtune
 @item -mtune=@var{processor-string}
 Optimize the output for the given processor, specified by microarchitecture or