[Bug lto/88159] New: LTO seems to mishandle exceptions that're thrown from c-linkage functions

[wanyingloo at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88159

            Bug ID: 88159
           Summary: LTO seems to mishandle exceptions that're thrown from
                    c-linkage functions
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
          Assignee: unassigned at gcc dot gnu.org
          Reporter: wanyingloo at gmail dot com
                CC: marxin at gcc dot gnu.org
  Target Milestone: ---

This looks to be a bug in LTO. Can someone please confirm?

$ cat main.cpp
#include <string>
extern "C" void run();
extern "C" void throw_ex(const char *err_text)
{
    throw std::string(err_text);
}
void call()
{
    try { run(); }
    catch (std::string &msg) {}
}
int main(int argc, char *argv[])
{
    call();
}

$ cat util.c
void throw_ex(const char*);
void run()
{
    throw_ex("foobar");
}

$ g++ -v
Using built-in specs.
COLLECT_GCC=/opt/pkg/gcc-7.3.0/bin/g++
COLLECT_LTO_WRAPPER=/opt/pkg/gcc-7.3.0/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --prefix=/opt/pkg/gcc-7.3.0
--program-suffix=-7.3.0 --enable-languages=c,c++ --disable-multilib
Thread model: posix
gcc version 7.3.0 (GCC) 

$ g++ -xc util.c -xc++ main.cpp -O2

$ ./a.out 

$ g++ -xc util.c -xc++ main.cpp -O2 -flto

$ ./a.out 
terminate called after throwing an instance of
'std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>
>'
Aborted