On Mon, Sep 26, 2022 at 12:34:04PM -0400, Jason Merrill wrote: > On 9/26/22 03:50, Richard Biener wrote: > > On Fri, Sep 23, 2022 at 8:41 PM Marek Polacek via Gcc-patches > > <gcc-patches@gcc.gnu.org> wrote: > > > > > > In <https://gcc.gnu.org/pipermail/gcc-patches/2022-September/602057.html> > > > Jason noticed that we quote "nothrow" in diagnostics even though it's > > > not a keyword in C++. Just removing the quotes didn't work because > > > then -Wformat-diag complains, so this patch replaces it with "no-throw". > > > > > > Bootstrapped/regtested on x86_64-pc-linux-gnu, ok for trunk? > > > > That doesn't look like an improvement to me. Can we quote 'nothrow()' > > instead?
Understood. > nothrow() is a syntax error; the C++11 keyword is 'noexcept'. std::nothrow > is a dummy placement argument used to indicate that a new-expression should > return null rather than throw on failure. > > But bizarrely, the library traits use the word "nothrow". Marek's patch > clarifies that we are not trying to refer to anything in the language. > > > I'd rather leave it alone than changing it to no-throw. Why does > > -Wformat-diag > > complain? If we shouldn't quote nothrow that should be adjusted? > > I think -Wformat-diag complains because "nothrow" is an attribute; it also > includes some other attribute names in the list of "keywords". > > I would also be fine with just removing the quotes and removing nothrow from > c_keywords. Like below? Bootstrapped/regtested on x86_64-pc-linux-gnu. Note that now I see warnings with my system compiler (gcc-12.2.1). Can I commit the c-format.cc hunk to gcc 12 so that eventually even gcc 12 stops warning? -- >8 -- In <https://gcc.gnu.org/pipermail/gcc-patches/2022-September/602057.html> Jason noticed that we quote "nothrow" in diagnostics even though it's not a keyword in C++. This patch removes the quotes and also drops "nothrow" from c_keywords. gcc/c-family/ChangeLog: * c-format.cc (c_keywords): Drop nothrow. gcc/cp/ChangeLog: * constraint.cc (diagnose_trait_expr): Say "nothrow" without quotes rather than in quotes. gcc/testsuite/ChangeLog: * g++.dg/cpp2a/concepts-traits3.C: Adjust expected diagnostics. --- gcc/c-family/c-format.cc | 3 +-- gcc/cp/constraint.cc | 14 +++++++------- gcc/testsuite/g++.dg/cpp2a/concepts-traits3.C | 8 ++++---- 3 files changed, 12 insertions(+), 13 deletions(-) diff --git a/gcc/c-family/c-format.cc b/gcc/c-family/c-format.cc index a6c380bf1c8..a2026591ed1 100644 --- a/gcc/c-family/c-format.cc +++ b/gcc/c-family/c-format.cc @@ -2900,7 +2900,7 @@ static const token_t cxx_opers[] = }; /* Common C/C++ keywords that are expected to be quoted within the format - string. Keywords like auto, inline, or volatile are exccluded because + string. Keywords like auto, inline, or volatile are excluded because they are sometimes used in common terms like /auto variables/, /inline function/, or /volatile access/ where they should not be quoted. */ @@ -2927,7 +2927,6 @@ static const token_t c_keywords[] = NAME ("noinline", NULL), NAME ("nonnull", NULL), NAME ("noreturn", NULL), - NAME ("nothrow", NULL), NAME ("offsetof", NULL), NAME ("readonly", "read-only"), NAME ("readwrite", "read-write"), diff --git a/gcc/cp/constraint.cc b/gcc/cp/constraint.cc index 5839bfb4b52..266ec581a20 100644 --- a/gcc/cp/constraint.cc +++ b/gcc/cp/constraint.cc @@ -3592,13 +3592,13 @@ diagnose_trait_expr (tree expr, tree args) switch (TRAIT_EXPR_KIND (expr)) { case CPTK_HAS_NOTHROW_ASSIGN: - inform (loc, " %qT is not %<nothrow%> copy assignable", t1); + inform (loc, " %qT is not nothrow copy assignable", t1); break; case CPTK_HAS_NOTHROW_CONSTRUCTOR: - inform (loc, " %qT is not %<nothrow%> default constructible", t1); + inform (loc, " %qT is not nothrow default constructible", t1); break; case CPTK_HAS_NOTHROW_COPY: - inform (loc, " %qT is not %<nothrow%> copy constructible", t1); + inform (loc, " %qT is not nothrow copy constructible", t1); break; case CPTK_HAS_TRIVIAL_ASSIGN: inform (loc, " %qT is not trivially copy assignable", t1); @@ -3674,7 +3674,7 @@ diagnose_trait_expr (tree expr, tree args) inform (loc, " %qT is not trivially assignable from %qT", t1, t2); break; case CPTK_IS_NOTHROW_ASSIGNABLE: - inform (loc, " %qT is not %<nothrow%> assignable from %qT", t1, t2); + inform (loc, " %qT is not nothrow assignable from %qT", t1, t2); break; case CPTK_IS_CONSTRUCTIBLE: if (!t2) @@ -3690,9 +3690,9 @@ diagnose_trait_expr (tree expr, tree args) break; case CPTK_IS_NOTHROW_CONSTRUCTIBLE: if (!t2) - inform (loc, " %qT is not %<nothrow%> default constructible", t1); + inform (loc, " %qT is not nothrow default constructible", t1); else - inform (loc, " %qT is not %<nothrow%> constructible from %qE", t1, t2); + inform (loc, " %qT is not nothrow constructible from %qE", t1, t2); break; case CPTK_HAS_UNIQUE_OBJ_REPRESENTATIONS: inform (loc, " %qT does not have unique object representations", t1); @@ -3701,7 +3701,7 @@ diagnose_trait_expr (tree expr, tree args) inform (loc, " %qT is not convertible from %qE", t2, t1); break; case CPTK_IS_NOTHROW_CONVERTIBLE: - inform (loc, " %qT is not %<nothrow%> convertible from %qE", t2, t1); + inform (loc, " %qT is not nothrow convertible from %qE", t2, t1); break; case CPTK_REF_CONSTRUCTS_FROM_TEMPORARY: inform (loc, " %qT is not a reference that binds to a temporary " diff --git a/gcc/testsuite/g++.dg/cpp2a/concepts-traits3.C b/gcc/testsuite/g++.dg/cpp2a/concepts-traits3.C index f20608b6918..3e87da4611e 100644 --- a/gcc/testsuite/g++.dg/cpp2a/concepts-traits3.C +++ b/gcc/testsuite/g++.dg/cpp2a/concepts-traits3.C @@ -21,7 +21,7 @@ concept TriviallyAssignable = __is_trivially_assignable(T, U); template<class T, class U> concept NothrowAssignable = __is_nothrow_assignable(T, U); -// { dg-message "'S' is not 'nothrow' assignable from 'int'" "" { target *-*-* } .-1 } +// { dg-message "'S' is not nothrow assignable from 'int'" "" { target *-*-* } .-1 } template<class T, class... Args> concept Constructible = __is_constructible(T, Args...); @@ -37,9 +37,9 @@ concept TriviallyConstructible = __is_trivially_constructible(T, Args...); template<class T, class... Args> concept NothrowConstructible = __is_nothrow_constructible(T, Args...); -// { dg-message "'S' is not 'nothrow' default constructible" "" { target *-*-* } .-1 } -// { dg-message "'S' is not 'nothrow' constructible from 'int'" "" { target *-*-* } .-2 } -// { dg-message "'S' is not 'nothrow' constructible from 'int, char'" "" { target *-*-* } .-3 } +// { dg-message "'S' is not nothrow default constructible" "" { target *-*-* } .-1 } +// { dg-message "'S' is not nothrow constructible from 'int'" "" { target *-*-* } .-2 } +// { dg-message "'S' is not nothrow constructible from 'int, char'" "" { target *-*-* } .-3 } template<class T> concept UniqueObjReps = __has_unique_object_representations(T); base-commit: 7701ea4a70a5a5c0fd977da90a30ffc4f3f87617 -- 2.37.3
