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sudo_fatal: Fix build where compiler recognises [[noreturn]] attribute (C23)

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If the compiler supports [[noreturn]] as a attribute as in C23,
then we define sudo_noreturn to be it. When that's the case, we must place
it at the beginning of the declaration, before any other *extension*
attributes (__attribute(...)).

A bug has been filed with GCC regarding rejecting/accepting mixed
attribute styles.

sudo_dso_public is always an extension attribute, while sudo_noreturn only
might be, so put it first.

This only shows up with GCC 13 so far (see the linked GCC bug for a bit more
exploration). Clang 16 does support the attribute but doesn't let you use it
for earlier language versions (need to pass explicit -std=c2x, unlike with GCC here).

This is essentially a followup to e707ffe58b.

Tested with GCC 13.0.1 20230212 (unreleased), GCC 12.2.1 20230211,
Clang 16.0.0_rc2, and Clang 15.0.7.

Bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108796
Closes: https://github.com/sudo-project/sudo/issues/239
Fixes: e707ffe58b
Fixes: 16ae61dcd7
This commit is contained in:
Sam James
2023-02-15 03:20:36 +00:00
parent defec5d46e
commit 66359c2bc9
1 changed files with 6 additions and 6 deletions
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12
include/sudo_fatal.h
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@@ -171,12 +171,12 @@ sudo_dso_public int sudo_fatal_callback_deregister_v1(sudo_fatal_callback_t fun
sudo_dso_public int sudo_fatal_callback_register_v1(sudo_fatal_callback_t func);
sudo_dso_public char *sudo_warn_gettext_v1(const char *domainname, const char *msgid) sudo_attr_fmt_arg(2);
sudo_dso_public void sudo_warn_set_locale_func_v1(sudo_warn_setlocale_t func);
sudo_dso_public sudo_noreturn void sudo_fatal_nodebug_v1(const char *fmt, ...) sudo_printf0like(1, 2);
sudo_dso_public sudo_noreturn void sudo_fatalx_nodebug_v1(const char *fmt, ...) sudo_printflike(1, 2);
sudo_dso_public sudo_noreturn void sudo_gai_fatal_nodebug_v1(int errnum, const char *fmt, ...) sudo_printflike(2, 3);
sudo_dso_public sudo_noreturn void sudo_vfatal_nodebug_v1(const char *fmt, va_list ap) sudo_printf0like(1, 0);
sudo_dso_public sudo_noreturn void sudo_vfatalx_nodebug_v1(const char *fmt, va_list ap) sudo_printflike(1, 0);
sudo_dso_public sudo_noreturn void sudo_gai_vfatal_nodebug_v1(int errnum, const char *fmt, va_list ap) sudo_printflike(2, 0);
sudo_noreturn sudo_dso_public void sudo_fatal_nodebug_v1(const char *fmt, ...) sudo_printf0like(1, 2);
sudo_noreturn sudo_dso_public void sudo_fatalx_nodebug_v1(const char *fmt, ...) sudo_printflike(1, 2);
sudo_noreturn sudo_dso_public void sudo_gai_fatal_nodebug_v1(int errnum, const char *fmt, ...) sudo_printflike(2, 3);
sudo_noreturn sudo_dso_public void sudo_vfatal_nodebug_v1(const char *fmt, va_list ap) sudo_printf0like(1, 0);
sudo_noreturn sudo_dso_public void sudo_vfatalx_nodebug_v1(const char *fmt, va_list ap) sudo_printflike(1, 0);
sudo_noreturn sudo_dso_public void sudo_gai_vfatal_nodebug_v1(int errnum, const char *fmt, va_list ap) sudo_printflike(2, 0);
sudo_dso_public void sudo_warn_nodebug_v1(const char *fmt, ...) sudo_printf0like(1, 2);
sudo_dso_public void sudo_warnx_nodebug_v1(const char *fmt, ...) sudo_printflike(1, 2);
sudo_dso_public void sudo_gai_warn_nodebug_v1(int errnum, const char *fmt, ...) sudo_printflike(2, 3);