https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86567
Bug ID: 86567
Summary: [8/9 Regression] -Wnonnull/-Wformat/-Wrestrict affect
code generation
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: amonakov at gcc dot gnu.org
Target Milestone: ---
#include <vector>
std::vector<int>
f()
{
std::vector<int> r;
return r;
}
starting with gcc-8 ICEs using 'g++ -fcompare-debug=-Wnonnull' (as well as
Wformat, Wrestrict, Wsuggest-attribute=format)
cp/call.c:build_over_call() has:
if (warn_nonnull
|| warn_format
|| warn_suggest_attribute_format
|| warn_restrict)
{
tree *fargs = (!nargs ? argarray
: (tree *) alloca (nargs * sizeof (tree)));
for (j = 0; j < nargs; j++)
{
/* For -Wformat undo the implicit passing by hidden reference
done by convert_arg_to_ellipsis. */
if (TREE_CODE (argarray[j]) == ADDR_EXPR
&& TYPE_REF_P (TREE_TYPE (argarray[j])))
fargs[j] = TREE_OPERAND (argarray[j], 0);
else
fargs[j] = maybe_constant_value (argarray[j]);
}
warned_p = check_function_arguments (input_location, fn, TREE_TYPE (fn),
nargs, fargs, NULL);
}
which if bypassed does not cause the ICE, which indicates that something in the
snippet may affect code generation (not investigating further).
