https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85926
Bug ID: 85926
Summary: feature request: more fine-grained
Wno-ignored-attributes
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: rv at rasmusvillemoes dot dk
Target Milestone: ---
I need to enable -mlongcall for a PPC/VxWorks target. However, starting from
gcc 6, that leads to lots of warnings due to the "longcall" attribute being
implicitly added to all function declarations. I can (and for now do) set
-Wno-ignored-attributes, but I'd actually like to enable as many warnings as
possible, and Wignored-attributes seems like it could catch some potentially
problematic cases.
So would it be possible to implement something like
-Wno-ignored-attributes=longjump
i.e., be able to provide a list of attribute names that shouldn't cause a
warning? Then one could still get warnings about an ignored aligned attribute,
etc.
Looking briefly into the code, it looks like strip_typedefs should be able to
return a list of removed attributes rather than just a bool, and the code in
gcc/cp/pt.c could then check if there was any element in that list not in the
list of no-ignoredd-attributes exception list. Of course, that's
oversimplifying, since a bare -Wno-ignored-attributes would need to continue to
mean everything, and what would a subsequent -Wignored-attributes then do, etc.
