diff options
| author | Marek Polacek <polacek@redhat.com> | 2022-07-19 14:24:25 -0400 |
|---|---|---|
| committer | Marek Polacek <polacek@redhat.com> | 2022-07-19 14:25:31 -0400 |
| commit | deafa40eb57b39626e116ca6a15d34a34c57c9f6 (patch) | |
| tree | 1a90b312dd9145f204d08a99142a93cb2ed8e268 | |
| parent | 1a7200da71550e6f92da66f0b328bb20d3bcdf35 (diff) | |
c++: fix SIGFPE with -Wclass-memaccess [PR105634]
Here we crash because we attempt to % by 0. Thus fixed.
PR c++/105634
gcc/cp/ChangeLog:
* call.cc (maybe_warn_class_memaccess): Avoid % by zero.
gcc/testsuite/ChangeLog:
* g++.dg/warn/Wclass-memaccess-7.C: New test.
| -rw-r--r-- | gcc/cp/call.cc | 2 | ||||
| -rw-r--r-- | gcc/testsuite/g++.dg/warn/Wclass-memaccess-7.C | 13 |
2 files changed, 15 insertions, 0 deletions
diff --git a/gcc/cp/call.cc b/gcc/cp/call.cc index 726770d4db8..af92a961000 100644 --- a/gcc/cp/call.cc +++ b/gcc/cp/call.cc @@ -10333,6 +10333,8 @@ maybe_warn_class_memaccess (location_t loc, tree fndecl, /* Finally, warn on partial copies. */ unsigned HOST_WIDE_INT typesize = tree_to_uhwi (TYPE_SIZE_UNIT (desttype)); + if (typesize == 0) + break; if (unsigned HOST_WIDE_INT partial = tree_to_uhwi (sz) % typesize) warned = warning_at (loc, OPT_Wclass_memaccess, (typesize - partial > 1 diff --git a/gcc/testsuite/g++.dg/warn/Wclass-memaccess-7.C b/gcc/testsuite/g++.dg/warn/Wclass-memaccess-7.C new file mode 100644 index 00000000000..7e86b248629 --- /dev/null +++ b/gcc/testsuite/g++.dg/warn/Wclass-memaccess-7.C @@ -0,0 +1,13 @@ +// PR c++/105634 +// { dg-do compile { target { c++11 } } } +// { dg-options "-Wall" } + +struct s +{ + struct {} a[] = 1.0; // { dg-error "" } + void f (char *c) + { + s s; + __builtin_memcpy (&s, c, sizeof(s)); + } +}; |