[Bug c++/19291] New: Warning "cannot pass objects of non-POD type" should be an error

["loose at astron dot nl" <gcc-bugzilla at gcc dot gnu dot org>]

<code>
#include <string>
#include <cstdio>
int main()
{
  std::string s("Hello World");
  printf("%s\n", s);
  return 0;
}
</code>

$ /usr/local/gcc343/bin/g++ nonPODWarn.cc
nonPODWarn.cc: In function `int main()':
nonPODWarn.cc:6: warning: cannot pass objects of non-POD type `struct 
std::string' through `...'; call will abort at runtime

This warning should IMHO really be turned into an error. The diagnostic ends 
with "... call will abort at runtime", which sounds pretty severe to me!


$ /usr/local/gcc343/bin/g++ -v -save-temps nonPODWarn.cc
Reading specs from /usr/local/gcc343/lib/gcc/i686-pc-linux-gnu/3.4.3/specs
Configured with: ../gcc-3.4.3/configure --prefix=/usr/local/gcc343 --enable-
threads=posix
Thread model: posix
gcc version 3.4.3
 /usr/local/gcc343/libexec/gcc/i686-pc-linux-gnu/3.4.3/cc1plus -E -quiet -v -
D_GNU_SOURCE nonPODWarn.cc -mtune=pentiumpro -o nonPODWarn.ii
ignoring nonexistent directory "/usr/local/gcc343/lib/gcc/i686-pc-linux-
gnu/3.4.3/../../../../i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/gcc343/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../../include/c++/3.4.3
 /usr/local/gcc343/lib/gcc/i686-pc-linux-
gnu/3.4.3/../../../../include/c++/3.4.3/i686-pc-linux-gnu
 /usr/local/gcc343/lib/gcc/i686-pc-linux-
gnu/3.4.3/../../../../include/c++/3.4.3/backward
 /usr/local/include
 /usr/local/gcc343/include
 /usr/local/gcc343/lib/gcc/i686-pc-linux-gnu/3.4.3/include
 /usr/include
End of search list.
 /usr/local/gcc343/libexec/gcc/i686-pc-linux-gnu/3.4.3/cc1plus -fpreprocessed 
nonPODWarn.ii -quiet -dumpbase nonPODWarn.cc -mtune=pentiumpro -auxbase 
nonPODWarn -version -o nonPODWarn.s
GNU C++ version 3.4.3 (i686-pc-linux-gnu)
        compiled by GNU C version 3.4.3.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
nonPODWarn.cc: In function `int main()':
nonPODWarn.cc:6: warning: cannot pass objects of non-POD type `struct 
std::string' through `...'; call will abort at runtime
 as -V -Qy -o nonPODWarn.o nonPODWarn.s
GNU assembler version 2.13.90.0.18 (i386-redhat-linux) using BFD version 
2.13.90.0.18 20030206
 /usr/local/gcc343/libexec/gcc/i686-pc-linux-gnu/3.4.3/collect2 --eh-frame-hdr -
m elf_i386 -dynamic-linker /lib/ld-
linux.so.2 /usr/lib/crt1.o /usr/lib/crti.o /usr/local/gcc343/lib/gcc/i686-pc-
linux-gnu/3.4.3/crtbegin.o -L/usr/local/gcc343/lib/gcc/i686-pc-linux-gnu/3.4.3 -
L/usr/local/gcc343/lib/gcc/i686-pc-linux-gnu/3.4.3/../../.. nonPODWarn.o -
lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/local/gcc343/lib/gcc/i686-pc-
linux-gnu/3.4.3/crtend.o /usr/lib/crtn.o

-- 
           Summary: Warning "cannot pass objects of non-POD type" should be
                    an error
           Product: gcc
           Version: 3.4.3
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: loose at astron dot nl
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19291