From: Palmer Dabbelt <pal...@rivosinc.com>
gcc/ChangeLog:
* doc/invoke.texi: Describe -march behavior for dependent extensions on
RISC-V.
---
Ok'd by Jeff Law here:
https://inbox.sourceware.org/gcc-patches/fae68675-519f-4d80-b0fb-dfd5d8a22...@gmail.com/
I'll let it sit on the lists overnight and commit in the morning tomorrow (PST
timezone).
---
gcc/doc/invoke.texi | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 68ebd79d676..1181ee2de14 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
--
2.43.2
