https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108700
Bug ID: 108700
Summary: false _Noreturn error with
-Werror=old-style-declaration
Product: gcc
Version: 12.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: vincent-gcc at vinc17 dot net
Target Milestone: ---
With gcc-12 (Debian 12.2.0-14) 12.2.0 (but this error was already present in
GCC 4.8):
cventin% echo 'int _Noreturn does_not_return (void) { for (;;) continue; }' |
gcc-12 -xc -c -Werror=old-style-declaration -
<stdin>:1:1: error: ‘_Noreturn’ is not at beginning of declaration
[-Werror=old-style-declaration]
cc1: some warnings being treated as errors
This error is incorrect. The grammar in ISO C17 is
function-definition:
declaration-specifiers declarator declaration-listopt compound-statement
declaration-specifiers:
storage-class-specifier declaration-specifiersopt
type-specifier declaration-specifiersopt
type-qualifier declaration-specifiersopt
function-specifier declaration-specifiersopt
alignment-specifier declaration-specifiersopt
where "int" is part of type-specifier and "_Noreturn" is part of
function-specifier, so that they can be in any order.
Note that the
int _Noreturn does_not_return (void) { for (;;) continue; }
comes from one of the autoconf tests, which fails as a consequence.
