[Bug c/100343] New: add -Wundefined-inline for inline function is used but not defined

[Bug c/100343] New: add -Wundefined-inline for inline function is used but not defined

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100343

            Bug ID: 100343
           Summary: add -Wundefined-inline for inline function is used but
                    not defined
           Product: gcc
           Version: 11.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: msebor at gcc dot gnu.org
  Target Milestone: ---

Clang provides -Wundefined-inline to control the warning about used inline
functions for which no definition has been provided.  GCC doesn't provide any
option to control the warning.  This is a request to add -Wundefined-inline
with the same effect as in Clang, both in C++ and in C.

$ (set -x && cat t.C && clang -S -Wall t.C && gcc -S -Wall t.C)
+ cat t.C
inline int f ();
int g () { return f (); }
+ clang -S -Wall t.C
t.C:1:12: warning: inline function 'f' is not defined [-Wundefined-inline]
inline int f ();
           ^
t.C:2:19: note: used here
int g () { return f (); }
                  ^
1 warning generated.
+ /build/gcc-master/gcc/xgcc -B /build/gcc-master/gcc -S -Wall t.C
t.C:1:12: warning: inline function ‘int f()’ used but never defined
    1 | inline int f ();
      |            ^

[Bug c/100343] add -Wundefined-inline for inline function is used but not defined

[a.samirh78 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100343

Ahmad Samir <a.samirh78 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |a.samirh78 at gmail dot com

--- Comment #1 from Ahmad Samir <a.samirh78 at gmail dot com> ---
Looks like a duplicate of bug 66918.

[Bug c/100343] add -Wundefined-inline for inline function is used but not defined

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100343

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Dup of bug 66918.

*** This bug has been marked as a duplicate of bug 66918 ***