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[2603:7000:9500:34a5::1db4]) by smtp.gmail.com with ESMTPSA id i8-20020a05620a27c800b0077d73fde842sm830712qkp.56.2023.11.30.13.10.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Nov 2023 13:10:16 -0800 (PST) Date: Thu, 30 Nov 2023 16:10:14 -0500 From: Marek Polacek To: Florian Weimer Cc: gcc-patches@gcc.gnu.org Subject: Re: [PATCH v3 11/11] c: Add new -Wdeclaration-missing-parameter-type permerror Message-ID: References: <700d70e4a2874645ddb67a8a335131d83b242e69.1700473918.git.fweimer@redhat.com> MIME-Version: 1.0 In-Reply-To: <700d70e4a2874645ddb67a8a335131d83b242e69.1700473918.git.fweimer@redhat.com> User-Agent: Mutt/2.2.9 (2022-11-12) X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-12.3 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,GIT_PATCH_0,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE,TXREP,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On Mon, Nov 20, 2023 at 10:56:42AM +0100, Florian Weimer wrote: > This used to be a warning, enabled by default, without its own option. I think this patch is OK now. > A subsequent change could improve diagnostics and provide spelling > hints for declarations like “void function (int32t);”. Feel free to open a PR. > gcc/c-family/ > > * c.opt (Wdeclaration-missing-parameter-type): New. > > gcc/c/ChangeLog: > > PR other/44209 FWIW, these usually go before the whole ChangeLog entry. Thanks, and sorry about the wait. > * c-decl.cc (grokparms): Issue permerror for > OPT_Wdeclaration_missing_parameter_type instead of a pedwarn. > > gcc/ChangeLog: > > * doc/invoke.texi (Warning Options): Document > -Wdeclaration-missing-parameter-type. > > gcc/testsuite/ChangeLog: > > * gcc.dg/permerror-default.c (missing_parameter_type): > Expect error. > * gcc.dg/permerror-fpermissive.c (missing_parameter_type): > Expect -Wdeclaration-missing-parameter-type warning. > * gcc.dg/permerror-gnu89-nopermissive.c (missing_parameter_type): > Expect -Wdeclaration-missing-parameter-type error. > * gcc.dg/permerror-gnu89-pedantic.c (missing_parameter_type): > Likewise. > * gcc.dg/permerror-gnu89.c (missing_parameter_type): > Expect -Wdeclaration-missing-parameter-type warning. > * gcc.dg/permerror-noerror.c: Add > -Wno-error=declaration-missing-parameter-type to build flags. > (missing_parameter_type): Expect > -Wdeclaration-missing-parameter-type warning. > * gcc.dg/permerror-nowarning.c: Build with > -Wno-declaration-missing-parameter-type. Remove previously > expected warning. > * gcc.dg/permerror-fpermissive-nowarning.c: Likewise. > * gcc.dg/permerror-pedantic.c (missing_parameter_type): > Expect -Wdeclaration-missing-parameter-type error. > * gcc.dg/permerror-system.c (missing_parameter_type): > Likewise. > --- > gcc/c-family/c.opt | 4 ++++ > gcc/c/c-decl.cc | 6 ++++-- > gcc/doc/invoke.texi | 17 ++++++++++++++++- > gcc/testsuite/gcc.dg/permerror-default.c | 2 +- > .../gcc.dg/permerror-fpermissive-nowarning.c | 7 +------ > gcc/testsuite/gcc.dg/permerror-fpermissive.c | 2 +- > .../gcc.dg/permerror-gnu89-nopermissive.c | 2 +- > gcc/testsuite/gcc.dg/permerror-gnu89-pedantic.c | 2 +- > gcc/testsuite/gcc.dg/permerror-gnu89.c | 2 +- > gcc/testsuite/gcc.dg/permerror-noerror.c | 4 ++-- > gcc/testsuite/gcc.dg/permerror-nowarning.c | 7 +------ > gcc/testsuite/gcc.dg/permerror-pedantic.c | 2 +- > gcc/testsuite/gcc.dg/permerror-system.c | 2 ++ > 13 files changed, 36 insertions(+), 23 deletions(-) > > diff --git a/gcc/c-family/c.opt b/gcc/c-family/c.opt > index b10c6057cd1..723e8c3e27b 100644 > --- a/gcc/c-family/c.opt > +++ b/gcc/c-family/c.opt > @@ -591,6 +591,10 @@ Wdeclaration-after-statement > C ObjC Var(warn_declaration_after_statement) Init(-1) Warning > Warn when a declaration is found after a statement. > > +Wdeclaration-missing-parameter-type > +C ObjC Var(warn_declaration_missing_parameter) Warning Init(1) > +Warn for missing parameter types in function declarations. > + > Wdelete-incomplete > C++ ObjC++ Var(warn_delete_incomplete) Init(1) Warning > Warn when deleting a pointer to incomplete type. > diff --git a/gcc/c/c-decl.cc b/gcc/c/c-decl.cc > index d16958113a8..3d9bee54259 100644 > --- a/gcc/c/c-decl.cc > +++ b/gcc/c/c-decl.cc > @@ -8337,8 +8337,10 @@ grokparms (struct c_arg_info *arg_info, bool funcdef_flag) > { > if (!funcdef_flag) > { > - pedwarn (input_location, 0, "parameter names (without types) in " > - "function declaration"); > + permerror_opt (input_location, > + OPT_Wdeclaration_missing_parameter_type, > + "parameter names (without types) in " > + "function declaration"); > arg_info->parms = NULL_TREE; > } > else > diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi > index be33da71c44..7f5da45dcea 100644 > --- a/gcc/doc/invoke.texi > +++ b/gcc/doc/invoke.texi > @@ -504,7 +504,8 @@ Objective-C and Objective-C++ Dialects}. > > @item C and Objective-C-only Warning Options > @gccoptlist{-Wbad-function-cast -Wmissing-declarations > --Wmissing-parameter-type -Wmissing-prototypes -Wmissing-variable-declarations > +-Wmissing-parameter-type -Wdeclaration-missing-parameter-type > +-Wmissing-prototypes -Wmissing-variable-declarations > -Wnested-externs -Wold-style-declaration -Wold-style-definition > -Wstrict-prototypes -Wtraditional -Wtraditional-conversion > -Wdeclaration-after-statement -Wpointer-sign} > @@ -9734,6 +9735,20 @@ void foo(bar) @{ @} > > This warning is also enabled by @option{-Wextra}. > > +@opindex Wno-declaration-missing-parameter-type > +@opindex Wdeclaration-missing-parameter-type > +@item -Wno-declaration-missing-parameter-type @r{(C and Objective-C only)} > +Do not warn if a function declaration contains a parameter name without > +a type. Such function declarations do not provide a function prototype > +and prevent most type checking in function calls. > + > +This warning is enabled by default. In C99 and later dialects of C, it > +is treated as an error. The error can be downgraded to a warning using > +@option{-fpermissive} (along with certain other errors), or for this > +error alone, with @option{-Wno-error=declaration-missing-parameter-type}. > + > +This warning is upgraded to an error by @option{-pedantic-errors}. > + > @opindex Wmissing-prototypes > @opindex Wno-missing-prototypes > @item -Wmissing-prototypes @r{(C and Objective-C only)} > diff --git a/gcc/testsuite/gcc.dg/permerror-default.c b/gcc/testsuite/gcc.dg/permerror-default.c > index 45b58b0131d..c674d689081 100644 > --- a/gcc/testsuite/gcc.dg/permerror-default.c > +++ b/gcc/testsuite/gcc.dg/permerror-default.c > @@ -19,7 +19,7 @@ implicit_int_4 (i) /* { dg-error "return type defaults to 'int' \\\[-Wimplicit-i > (const) 0; /* { dg-error "type defaults to 'int' in type name \\\[-Wimplicit-int\\\]" } */ > } > > -extern int missing_parameter_type (i); /* { dg-warning "parameter names \\\(without types\\\) in function declaration\n" } */ > +extern int missing_parameter_type (i); /* { dg-error "parameter names \\\(without types\\\) in function declaration \\\[-Wdeclaration-missing-parameter-type\\\]" } */ > > > int * > diff --git a/gcc/testsuite/gcc.dg/permerror-fpermissive-nowarning.c b/gcc/testsuite/gcc.dg/permerror-fpermissive-nowarning.c > index f15b21ef43d..d07c8636677 100644 > --- a/gcc/testsuite/gcc.dg/permerror-fpermissive-nowarning.c > +++ b/gcc/testsuite/gcc.dg/permerror-fpermissive-nowarning.c > @@ -1,11 +1,6 @@ > -/* { dg-options "-fpermissive -Wno-implicit-function-declaration -Wno-implicit-int -Wno-int-conversion -Wno-incompatible-pointer-types -Wno-return-mismatch" } */ > +/* { dg-options "-fpermissive -Wno-implicit-function-declaration -Wno-implicit-int -Wno-int-conversion -Wno-incompatible-pointer-types -Wno-return-mismatch -Wno-declaration-missing-parameter-type" } */ > > /* This test checks that permerrors can be disabled using -Wno-* options even > if -fpermissive is used. */ > > #include "permerror-default.c" > - > -/* Ideally, we do not want to see any warnings here, but this warning is not > - yet controlled by its own option. */ > - > -/* { dg-warning "parameter names \\\(without types\\\) in function declaration\n" "" { target *-*-* } 22 } */ > diff --git a/gcc/testsuite/gcc.dg/permerror-fpermissive.c b/gcc/testsuite/gcc.dg/permerror-fpermissive.c > index 139f35ad1c0..fd3020d75ee 100644 > --- a/gcc/testsuite/gcc.dg/permerror-fpermissive.c > +++ b/gcc/testsuite/gcc.dg/permerror-fpermissive.c > @@ -19,7 +19,7 @@ implicit_int_4 (i) /* { dg-warning "return type defaults to 'int' \\\[-Wimplicit > (const) 0; /* { dg-warning "type defaults to 'int' in type name \\\[-Wimplicit-int\\\]" } */ > } > > -extern int missing_parameter_type (i); /* { dg-warning "parameter names \\\(without types\\\) in function declaration\n" } */ > +extern int missing_parameter_type (i); /* { dg-warning "parameter names \\\(without types\\\) in function declaration \\\[-Wdeclaration-missing-parameter-type\\\]" } */ > > > int * > diff --git a/gcc/testsuite/gcc.dg/permerror-gnu89-nopermissive.c b/gcc/testsuite/gcc.dg/permerror-gnu89-nopermissive.c > index 93504b94139..aba4b2498f7 100644 > --- a/gcc/testsuite/gcc.dg/permerror-gnu89-nopermissive.c > +++ b/gcc/testsuite/gcc.dg/permerror-gnu89-nopermissive.c > @@ -19,7 +19,7 @@ implicit_int_4 (i) /* { dg-bogus "-Wimplicit-int" } */ > (const) 0; /* { dg-bogus "-Wimplicit-int" } */ > } > > -extern int missing_parameter_type (i); /* { dg-warning "parameter names \\\(without types\\\) in function declaration\n" } */ > +extern int missing_parameter_type (i); /* { dg-error "parameter names \\\(without types\\\) in function declaration \\\[-Wdeclaration-missing-parameter-type\\\]" } */ > > > int * > diff --git a/gcc/testsuite/gcc.dg/permerror-gnu89-pedantic.c b/gcc/testsuite/gcc.dg/permerror-gnu89-pedantic.c > index 465a16f5f9a..ef4dbfc86c5 100644 > --- a/gcc/testsuite/gcc.dg/permerror-gnu89-pedantic.c > +++ b/gcc/testsuite/gcc.dg/permerror-gnu89-pedantic.c > @@ -19,7 +19,7 @@ implicit_int_4 (i) /* { dg-bogus "-Wimplicit-int" } */ > (const) 0; /* { dg-bogus "-Wimplicit-int" } */ > } > > -extern int missing_parameter_type (i); /* { dg-error "parameter names \\\(without types\\\) in function declaration\n" } */ > +extern int missing_parameter_type (i); /* { dg-error "parameter names \\\(without types\\\) in function declaration \\\[-Wdeclaration-missing-parameter-type\\\]" } */ > > > int * > diff --git a/gcc/testsuite/gcc.dg/permerror-gnu89.c b/gcc/testsuite/gcc.dg/permerror-gnu89.c > index 66f7789269f..83792ecfaac 100644 > --- a/gcc/testsuite/gcc.dg/permerror-gnu89.c > +++ b/gcc/testsuite/gcc.dg/permerror-gnu89.c > @@ -19,7 +19,7 @@ implicit_int_4 (i) /* { dg-bogus "-Wimplicit-int" } */ > (const) 0; /* { dg-bogus "-Wimplicit-int" } */ > } > > -extern int missing_parameter_type (i); /* { dg-warning "parameter names \\\(without types\\\) in function declaration\n" } */ > +extern int missing_parameter_type (i); /* { dg-warning "parameter names \\\(without types\\\) in function declaration \\\[-Wdeclaration-missing-parameter-type\\\]" } */ > > > int * > diff --git a/gcc/testsuite/gcc.dg/permerror-noerror.c b/gcc/testsuite/gcc.dg/permerror-noerror.c > index cd1c2013cb5..fc68dfa8bb9 100644 > --- a/gcc/testsuite/gcc.dg/permerror-noerror.c > +++ b/gcc/testsuite/gcc.dg/permerror-noerror.c > @@ -1,4 +1,4 @@ > -/* { dg-options "-Wno-error=implicit-function-declaration -Wno-error=implicit-int -Wno-error=int-conversion -Wno-error=incompatible-pointer-types -Wno-error=return-mismatch" } */ > +/* { dg-options "-Wno-error=implicit-function-declaration -Wno-error=implicit-int -Wno-error=int-conversion -Wno-error=incompatible-pointer-types -Wno-error=return-mismatch -Wno-error=declaration-missing-parameter-type" } */ > > /* This test should emulate the effect of -fpermissive by adding all the > -Wno-error= options that are implied by -fpermissive. It needs to be > @@ -19,7 +19,7 @@ implicit_int_4 (i) /* { dg-warning "return type defaults to 'int' \\\[-Wimplicit > (const) 0; /* { dg-warning "type defaults to 'int' in type name \\\[-Wimplicit-int\\\]" } */ > } > > -extern int missing_parameter_type (i); /* { dg-warning "parameter names \\\(without types\\\) in function declaration\n" } */ > +extern int missing_parameter_type (i); /* { dg-warning "parameter names \\\(without types\\\) in function declaration \\\[-Wdeclaration-missing-parameter-type\\\]" } */ > > > int * > diff --git a/gcc/testsuite/gcc.dg/permerror-nowarning.c b/gcc/testsuite/gcc.dg/permerror-nowarning.c > index da6bd08245d..b1cf7990127 100644 > --- a/gcc/testsuite/gcc.dg/permerror-nowarning.c > +++ b/gcc/testsuite/gcc.dg/permerror-nowarning.c > @@ -1,10 +1,5 @@ > -/* { dg-options "-Wno-implicit-function-declaration -Wno-implicit-int -Wno-int-conversion -Wno-incompatible-pointer-types -Wno-return-mismatch" } */ > +/* { dg-options "-Wno-implicit-function-declaration -Wno-implicit-int -Wno-int-conversion -Wno-incompatible-pointer-types -Wno-return-mismatch -Wno-declaration-missing-parameter-type" } */ > > /* This test checks that permerrors can be disabled using -Wno-* options. */ > > #include "permerror-default.c" > - > -/* Ideally, we do not want to see any warnings here, but this warning is not > - yet controlled by its own option. */ > - > -/* { dg-warning "parameter names \\\(without types\\\) in function declaration\n" "" { target *-*-* } 22 } */ > diff --git a/gcc/testsuite/gcc.dg/permerror-pedantic.c b/gcc/testsuite/gcc.dg/permerror-pedantic.c > index 95dda18acd4..2380bb2583c 100644 > --- a/gcc/testsuite/gcc.dg/permerror-pedantic.c > +++ b/gcc/testsuite/gcc.dg/permerror-pedantic.c > @@ -19,7 +19,7 @@ implicit_int_4 (i) /* { dg-error "return type defaults to 'int' \\\[-Wimplicit-i > (const) 0; /* { dg-error "type defaults to 'int' in type name \\\[-Wimplicit-int\\\]" } */ > } > > -extern int missing_parameter_type (i); /* { dg-error "parameter names \\\(without types\\\) in function declaration\n" } */ > +extern int missing_parameter_type (i); /* { dg-error "parameter names \\\(without types\\\) in function declaration \\\[-Wdeclaration-missing-parameter-type\\\]" } */ > > > int * > diff --git a/gcc/testsuite/gcc.dg/permerror-system.c b/gcc/testsuite/gcc.dg/permerror-system.c > index bd923138461..790e4f03d66 100644 > --- a/gcc/testsuite/gcc.dg/permerror-system.c > +++ b/gcc/testsuite/gcc.dg/permerror-system.c > @@ -17,6 +17,8 @@ > /* { dg-error "type of 'i' defaults to 'int' \\\[-Wimplicit-int\\\]" "" { target *-*-*} 16 } */ > /* { dg-error "type defaults to 'int' in type name \\\[-Wimplicit-int\\\]" "" { target *-*-* } 19 } */ > > +/* { dg-error "parameter names \\\(without types\\\) in function declaration \\\[-Wdeclaration-missing-parameter-type\\\]" "" { target *-*-* } 22 } */ > + > /* { dg-error "pointer/integer type mismatch in conditional expression \\\[-Wint-conversion\\\]" "" { target *-*-* } 29 } */ > /* { dg-error "pointer/integer type mismatch in conditional expression \\\[-Wint-conversion\\\]" "" { target *-*-* } 30 } */ > /* { dg-error "passing argument 1 of 'f2' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" "" { target *-*-* } 31 } */ > -- > 2.42.0 > Marek