From 9d87ad0ca5cd18807546a081e7d539be8b5418bf Mon Sep 17 00:00:00 2001
From: Tom de Vries <tdevries@suse.de>
Date: Fri, 25 Feb 2022 16:11:23 +0100
Subject: [nvptx] Add -mptx=_

Add an -mptx=_ value, that indicates the default ptx version.

It can be used to undo an explicit -mptx setting, so this:
...
$ gcc test.c -mptx=3.1 -mptx=_
...
has the same effect as:
...
$ gcc test.c
...

Tested on nvptx.

gcc/ChangeLog:

2022-02-28  Tom de Vries  <tdevries@suse.de>

	* config/nvptx/nvptx-opts.h (enum ptx_version): Add
	PTX_VERSION_default.
	* config/nvptx/nvptx.cc (handle_ptx_version_option): Handle
	PTX_VERSION_default.
	* config/nvptx/nvptx.opt: Add EnumValue "_" / PTX_VERSION_default.
---
 gcc/config/nvptx/nvptx-opts.h | 1 +
 gcc/config/nvptx/nvptx.cc     | 3 ++-
 gcc/config/nvptx/nvptx.opt    | 3 +++
 3 files changed, 6 insertions(+), 1 deletion(-)

(limited to 'gcc')

diff --git a/gcc/config/nvptx/nvptx-opts.h b/gcc/config/nvptx/nvptx-opts.h
index e918d43..30852b6 100644
--- a/gcc/config/nvptx/nvptx-opts.h
+++ b/gcc/config/nvptx/nvptx-opts.h
@@ -32,6 +32,7 @@ enum ptx_isa
 
 enum ptx_version
 {
+  PTX_VERSION_default,
   PTX_VERSION_3_0,
   PTX_VERSION_3_1,
   PTX_VERSION_4_2,
diff --git a/gcc/config/nvptx/nvptx.cc b/gcc/config/nvptx/nvptx.cc
index b9451c2..7862a90 100644
--- a/gcc/config/nvptx/nvptx.cc
+++ b/gcc/config/nvptx/nvptx.cc
@@ -296,7 +296,8 @@ sm_version_to_string (enum ptx_isa sm)
 static void
 handle_ptx_version_option (void)
 {
-  if (!OPTION_SET_P (ptx_version_option))
+  if (!OPTION_SET_P (ptx_version_option)
+      || ptx_version_option == PTX_VERSION_default)
     {
       ptx_version_option = default_ptx_version_option ();
       return;
diff --git a/gcc/config/nvptx/nvptx.opt b/gcc/config/nvptx/nvptx.opt
index 9776c3b..f555ad1 100644
--- a/gcc/config/nvptx/nvptx.opt
+++ b/gcc/config/nvptx/nvptx.opt
@@ -94,6 +94,9 @@ Enum(ptx_version) String(6.3) Value(PTX_VERSION_6_3)
 EnumValue
 Enum(ptx_version) String(7.0) Value(PTX_VERSION_7_0)
 
+EnumValue
+Enum(ptx_version) String(_) Value(PTX_VERSION_default)
+
 mptx=
 Target RejectNegative ToLower Joined Enum(ptx_version) Var(ptx_version_option)
 Specify the version of the ptx version to use.
-- 
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