[Bug libstdc++/98613] vstring mov testsuite failures on AIX

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98613

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic

--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
Yes, I think so.  I see code in the optimized dump that the warning should
trigger for even on x86_64 but doesn't due to a known bug/limitation in how GCC
determines the context into which a function defined in a system header has
been inlined.  All the calls to operator delete with _S_empty_rep should
trigger it:

$ /build/gcc-master/gcc/xg++ -B /build/gcc-master/gcc -nostdinc++ -I
/build/gcc-master/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu
-I /build/gcc-master/x86_64-pc-linux-gnu/libstdc++-v3/include -I
/src/gcc/master/libstdc++-v3/libsupc++ -I
/src/gcc/master/libstdc++-v3/include/backward -I
/src/gcc/master/libstdc++-v3/testsuite/util -L
/build/gcc-master/x86_64-pc-linux-gnu/libstdc++-v3/src/.libs -O3 -Wall
-fdump-tree-optimized=/dev/stdout
/src/gcc/master/libstdc++-v3/testsuite/ext/vstring/cons/moveable.cc | grep
delete
  operator delete (_17, _21); [tail call]
  operator delete (_35, _37);
  operator delete (_38, _40);
  operator delete (&MEM <struct _Rep> [(void *)&_S_empty_rep], _156);
  operator delete (_220, _224);
  operator delete (_288, _292);
  operator delete (_318, _322);
  operator delete (&MEM <struct _Rep> [(void *)&_S_empty_rep], _328);
  operator delete (&MEM <struct _Rep> [(void *)&_S_empty_rep], _334); [tail
call]