https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69253
Bug ID: 69253
Summary: g++ ICE (segfault) at -O0 on x86_64-linux-gnu in
"cxx_incomplete_type_diagnostic"
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: helloqirun at gmail dot com
Target Milestone: ---
The following code causes an ICE when compiled with the current g++ trunk at
-O0 on x86_64-linux-gnu in both 32-bit and 64-bit modes.
Please note that g++ with -O1 and above compiles the code snippet. Should g++
allow the initialization of flexible array members?
$ g++-trunk -v
Using built-in specs.
COLLECT_GCC=g++-trunk
COLLECT_LTO_WRAPPER=/home/absozero/trunk/root-gcc/libexec/gcc/x86_64-pc-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/home/absozero/trunk/root-gcc
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 6.0.0 20160112 (experimental) [trunk revision 232269] (GCC)
$ g++-trunk -O0 -c abc.cc
abc.cc: In function 'void fn1()':
abc.cc:5:33: internal compiler error: in cxx_incomplete_type_diagnostic, at
cp/typeck2.c:567
void fn1() { (struct str){1, ""}; }
^
0x6c53cf cxx_incomplete_type_diagnostic(tree_node const*, tree_node const*,
diagnostic_t)
../../gcc/gcc/cp/typeck2.c:567
0xf863fa size_in_bytes(tree_node const*)
../../gcc/gcc/tree.c:2925
0xa1369c int_expr_size
../../gcc/gcc/expr.c:11639
0xa2709a store_expr_with_bounds(tree_node*, rtx_def*, int, bool, bool,
tree_node*)
../../gcc/gcc/expr.c:5360
0xa28821 expand_assignment(tree_node*, tree_node*, bool)
../../gcc/gcc/expr.c:5021
0x91a9be expand_gimple_stmt_1
../../gcc/gcc/cfgexpand.c:3606
0x91a9be expand_gimple_stmt
../../gcc/gcc/cfgexpand.c:3702
0x91e0a4 expand_gimple_basic_block
../../gcc/gcc/cfgexpand.c:5708
0x923076 execute
../../gcc/gcc/cfgexpand.c:6323
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
------------------
$ cat abc.cc
struct str {
int a;
char s[];
};
void fn1() { (struct str){1, ""}; }
