This used to be a warning, enabled by default, without its own option. A subsequent change could improve diagnostics and provide spelling hints for declarations like “void function (int32t);”.
gcc/c-family/ * c.opt (Wdeclaration-missing-parameter-type): New. gcc/c/ChangeLog: PR other/44209 * 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-pedantic.c (missing_parameter_type): Expect -Wdeclaration-missing-parameter-type error. * 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-pedantic.c (missing_parameter_type): Expect -Wdeclaration-missing-parameter-type error. --- 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/testsuite/gcc.dg/permerror-fpermissive.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-pedantic.c | 2 +- gcc/testsuite/gcc.dg/permerror-system.c | 2 ++ 10 files changed, 33 insertions(+), 10 deletions(-) diff --git a/gcc/c-family/c.opt b/gcc/c-family/c.opt index b10c6057cd1..723985ec5d0 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 Warning +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 c492ef7ba0c..66804bfe120 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -502,7 +502,8 @@ 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} @@ -9732,6 +9733,20 @@ 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.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-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-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 } */ -- 2.41.0