https://bugs.kde.org/show_bug.cgi?id=387766
--- Comment #7 from Markus Trippelsdorf <octopl...@yandex.com> ---
The ENABLE_VALGRIND_ANNOTATIONS logic is in gcc/system.h:1143.
sparseset allocations are already handled in gcc/sparseset.c:
25 /* Allocate and clear a n_elms SparseSet. */
26
27 sparseset
28 sparseset_alloc (SPARSESET_ELT_TYPE n_elms)
29 {
30 unsigned int n_bytes = sizeof (struct sparseset_def)
31 + ((n_elms - 1) * 2 * sizeof
(SPARSESET_ELT_TYPE));
32
33 sparseset set = XNEWVAR (struct sparseset_def, n_bytes);
34
35 /* Mark the sparseset as defined to silence some valgrind uninitialized
36 read errors when accessing set->sparse[n] when "n" is not, and never
has
37 been, in the set. These uninitialized reads are expected, by design
and
38 harmless. */
39 VALGRIND_DISCARD (VALGRIND_MAKE_MEM_DEFINED (set, n_bytes));
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