AFAIK, the program below should have well-defined behavior but it abends with gcc 4.1.0 on Solaris 9.
$ cat t.cpp && g++ -g t.cpp -static && gdb ./a.out #include <valarray> int main () { const std::valarray<int> a; a.cshift (1); } GNU gdb 6.5 Copyright (C) 2006 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "sparc-sun-solaris2.9"... (gdb) run Starting program: a.out Program received signal SIGSEGV, Segmentation fault. 0x00024db8 in memcpy () (gdb) where #0 0x00024db8 in memcpy () #1 0x00010368 in std::_Array_copy_ctor<int, true>::_S_do_it (__b=0x0, __e=0x4, __o=0xffbffb94) at /usr/local/gcc-4.1.0/lib/gcc/sparc-sun-solaris2.9/4.1.0/../../../../include/c++/4.1.0/bits/valarray_array.h:165 #2 0x00010398 in std::__valarray_copy_construct<int> (__b=0x0, __e=0x4, __o=0xffbffb94) at /usr/local/gcc-4.1.0/lib/gcc/sparc-sun-solaris2.9/4.1.0/../../../../include/c++/4.1.0/bits/valarray_array.h:174 #3 0x0001057c in std::valarray<int>::cshift (this=0xffbffc20, __n=1) at /usr/local/gcc-4.1.0/lib/gcc/sparc-sun-solaris2.9/4.1.0/../../../../include/c++/4.1.0/valarray:821 #4 0x00010288 in main () at /nfs/b20/sebor/tmp/t.cpp:8 -- Summary: SIGSEGV in valarray::cshift(n) on empty array Product: gcc Version: 4.1.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libstdc++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: sebor at roguewave dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30416