[PATCH] RISC-V: Disable attribute generation by default

[Palmer Dabbelt <palmer@rivosinc.com>]

We generate a handful of attributes by default, but they don't really
encode any useful information.  We've broadly stopped ascribing any
meaning to them in binutils; but they trip up LLVM, older toolchains,
and users.  So let's just turn them off by default.  The old binaries
will still be floating around, but at least this way we'll stop tripping
over new incompatibilities.

If we get to a point where there's some attributes that are defined that
we can use then we can sort out how to turn those on without turning on
the old ones, but unless I'm missing something the current set of
attributes are too broken to be useful for anything.

gcc/ChangeLog:

	* config.gcc (--with-riscv-attribute): Default to off.
---
I know it's pretty late, but I'd like to target this for GCC-13.  The
Zmmul stuff has resulted in another round of build breakages that we're
going to have to chase down, and while we could update everything to
turn off the attributes it seems easier to just set the default.
---
 gcc/config.gcc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/config.gcc b/gcc/config.gcc
index c070e6ecd2e..52639cf26d6 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -4596,7 +4596,7 @@ case "${target}" in
 			tm_defines="${tm_defines} TARGET_RISCV_ATTRIBUTE=0"
 			;;
 		""|default)
-			tm_defines="${tm_defines} TARGET_RISCV_ATTRIBUTE=1"
+			tm_defines="${tm_defines} TARGET_RISCV_ATTRIBUTE=0"
 			;;
 		*)
 			echo "--with-riscv-attribute=${with_riscv_attribute} is not supported.  The argument must begin with yes, no or default." 1>&2
-- 
2.39.1