From 75ce04fba49eb30b6a8fe23bc3605cf0ef9a8e28 Mon Sep 17 00:00:00 2001 From: Joseph Myers Date: Tue, 27 Oct 2020 22:15:46 +0000 Subject: [PATCH] c: Allow duplicate C2x standard attributes N2557, accepted into C2x at the October WG14 meeting, removes the requirement that duplicates of standard attributes cannot appear within an attribute list (so allowing e.g. [[deprecated, deprecated]], where previously that was disallowed but [[deprecated]] [[deprecated]] was OK). Remove the code checking for this (standard attributes aren't in any released version of the C standard) and update tests accordingly. Bootstrapped with no regressions on x86_64-pc-linux-gnu. gcc/c/ 2020-10-27 Joseph Myers * c-parser.c (c_parser_std_attribute_specifier): Allow duplicate standard attributes. gcc/testsuite/ 2020-10-27 Joseph Myers * gcc.dg/c2x-attr-deprecated-4.c, gcc.dg/c2x-attr-fallthrough-4.c, gcc.dg/c2x-attr-maybe_unused-4.c: Allow duplicate attributes. --- gcc/c/c-parser.c | 54 +------------------------- gcc/testsuite/gcc.dg/c2x-attr-deprecated-4.c | 12 +++--- gcc/testsuite/gcc.dg/c2x-attr-fallthrough-4.c | 7 +--- gcc/testsuite/gcc.dg/c2x-attr-maybe_unused-4.c | 12 +++--- 4 files changed, 14 insertions(+), 71 deletions(-) diff --git a/gcc/c/c-parser.c b/gcc/c/c-parser.c index b6a7ef4..d49e508 100644 --- a/gcc/c/c-parser.c +++ b/gcc/c/c-parser.c @@ -4977,9 +4977,6 @@ c_parser_std_attribute (c_parser *parser, bool for_tm) static tree c_parser_std_attribute_specifier (c_parser *parser, bool for_tm) { - bool seen_deprecated = false; - bool seen_fallthrough = false; - bool seen_maybe_unused = false; location_t loc = c_parser_peek_token (parser)->location; if (!c_parser_require (parser, CPP_OPEN_SQUARE, "expected %<[%>")) return NULL_TREE; @@ -5005,55 +5002,8 @@ c_parser_std_attribute_specifier (c_parser *parser, bool for_tm) tree attribute = c_parser_std_attribute (parser, for_tm); if (attribute != error_mark_node) { - bool duplicate = false; - tree name = get_attribute_name (attribute); - tree ns = get_attribute_namespace (attribute); - if (ns == NULL_TREE) - { - /* Some standard attributes may appear at most once in - each attribute list. Diagnose duplicates and remove - them from the list to avoid subsequent diagnostics - such as the more general one for multiple - "fallthrough" attributes in the same place (including - in separate attribute lists in the same attribute - specifier sequence, which is not a constraint - violation). */ - if (is_attribute_p ("deprecated", name)) - { - if (seen_deprecated) - { - error ("attribute % can appear at most " - "once in an attribute-list"); - duplicate = true; - } - seen_deprecated = true; - } - else if (is_attribute_p ("fallthrough", name)) - { - if (seen_fallthrough) - { - error ("attribute % can appear at most " - "once in an attribute-list"); - duplicate = true; - } - seen_fallthrough = true; - } - else if (is_attribute_p ("maybe_unused", name)) - { - if (seen_maybe_unused) - { - error ("attribute % can appear at most " - "once in an attribute-list"); - duplicate = true; - } - seen_maybe_unused = true; - } - } - if (!duplicate) - { - TREE_CHAIN (attribute) = attributes; - attributes = attribute; - } + TREE_CHAIN (attribute) = attributes; + attributes = attribute; } if (c_parser_next_token_is_not (parser, CPP_COMMA)) break; diff --git a/gcc/testsuite/gcc.dg/c2x-attr-deprecated-4.c b/gcc/testsuite/gcc.dg/c2x-attr-deprecated-4.c index f1848a2..7698434 100644 --- a/gcc/testsuite/gcc.dg/c2x-attr-deprecated-4.c +++ b/gcc/testsuite/gcc.dg/c2x-attr-deprecated-4.c @@ -1,13 +1,11 @@ -/* Test C2x deprecated attribute: duplicates. */ +/* Test C2x deprecated attribute: duplicates (allowed after N2557). */ /* { dg-do compile } */ /* { dg-options "-std=c2x -pedantic-errors" } */ -[[deprecated, __deprecated__]] int a; /* { dg-error "can appear at most once" } */ -[[__deprecated__, deprecated("message")]] int b; /* { dg-error "can appear at most once" } */ -int c [[deprecated("message"), deprecated]]; /* { dg-error "can appear at most once" } */ -[[deprecated, deprecated]]; /* { dg-error "can appear at most once" } */ +[[deprecated, __deprecated__]] int a; +[[__deprecated__, deprecated("message")]] int b; +int c [[deprecated("message"), deprecated]]; +[[deprecated, deprecated]]; /* { dg-error "ignored" "ignored" { target *-*-* } .-1 } */ -/* Separate attribute lists in the same attribute specifier sequence, - with the same attribute in them, are OK. */ [[deprecated]] [[deprecated]] int d [[deprecated]] [[deprecated]]; diff --git a/gcc/testsuite/gcc.dg/c2x-attr-fallthrough-4.c b/gcc/testsuite/gcc.dg/c2x-attr-fallthrough-4.c index 75aceff..a6cedcd 100644 --- a/gcc/testsuite/gcc.dg/c2x-attr-fallthrough-4.c +++ b/gcc/testsuite/gcc.dg/c2x-attr-fallthrough-4.c @@ -1,4 +1,4 @@ -/* Test C2x fallthrough attribute: duplicates. */ +/* Test C2x fallthrough attribute: duplicates (allowed after N2557). */ /* { dg-do compile } */ /* { dg-options "-std=c2x -pedantic-errors" } */ @@ -9,12 +9,9 @@ f (int a) { case 1: a++; - [[fallthrough, __fallthrough__]]; /* { dg-error "can appear at most once" } */ + [[fallthrough, __fallthrough__]]; /* { dg-warning "specified multiple times" } */ case 2: a++; - /* Separate attribute lists in the same attribute specifier - sequence, with the same attribute in them, are OK (but - receive a warning). */ [[fallthrough]] [[fallthrough]]; /* { dg-warning "specified multiple times" } */ case 3: a++; diff --git a/gcc/testsuite/gcc.dg/c2x-attr-maybe_unused-4.c b/gcc/testsuite/gcc.dg/c2x-attr-maybe_unused-4.c index 300c0da..6b997aa 100644 --- a/gcc/testsuite/gcc.dg/c2x-attr-maybe_unused-4.c +++ b/gcc/testsuite/gcc.dg/c2x-attr-maybe_unused-4.c @@ -1,13 +1,11 @@ -/* Test C2x maybe_unused attribute: duplicates. */ +/* Test C2x maybe_unused attribute: duplicates (allowed after N2557). */ /* { dg-do compile } */ /* { dg-options "-std=c2x -pedantic-errors" } */ -[[maybe_unused, __maybe_unused__]] int a; /* { dg-error "can appear at most once" } */ -[[__maybe_unused__, maybe_unused]] int b; /* { dg-error "can appear at most once" } */ -int c [[maybe_unused, maybe_unused]]; /* { dg-error "can appear at most once" } */ -[[maybe_unused, maybe_unused]]; /* { dg-error "can appear at most once" } */ +[[maybe_unused, __maybe_unused__]] int a; +[[__maybe_unused__, maybe_unused]] int b; +int c [[maybe_unused, maybe_unused]]; +[[maybe_unused, maybe_unused]]; /* { dg-error "ignored" "ignored" { target *-*-* } .-1 } */ -/* Separate attribute lists in the same attribute specifier sequence, - with the same attribute in them, are OK. */ [[maybe_unused]] [[maybe_unused]] int d [[maybe_unused]] [[maybe_unused]]; -- 2.7.4