[committed][nvptx] Build libraries with mptx=3.1

Tom de Vries tdevries@suse.de
Thu Mar 3 09:46:32 GMT 2022


In gcc-5 to gcc-11, the ptx isa version was 3.1.

On trunk, the default is now 6.0, which is also what will be the value in
the libraries.

Consequently, there may be setups with an older driver that worked with
gcc-11, but will become unsupported with gcc-12.

Fix this by building the libraries with mptx=3.1.

After this, setups with an older driver still won't work out of the box
with gcc-12, because the default ptx isa version has changed, but should work
after specifying mptx=3.1.

Committed to trunk.

- Tom

[nvptx] Build libraries with mptx=3.1


2022-03-03  Tom de Vries  <tdevries@suse.de>

	* config/nvptx/t-nvptx (MULTILIB_EXTRA_OPTS): Add mptx=3.1.

 gcc/config/nvptx/t-nvptx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/config/nvptx/t-nvptx b/gcc/config/nvptx/t-nvptx
index 056d2dd2d04..8f67264d132 100644
--- a/gcc/config/nvptx/t-nvptx
+++ b/gcc/config/nvptx/t-nvptx
@@ -32,4 +32,4 @@ s-nvptx-gen-opt: $(srcdir)/config/nvptx/nvptx-sm.def
+MULTILIB_EXTRA_OPTS = misa=sm_30 mptx=3.1

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