gcc 4.3.2 libgcc_s.so exception handling broken?

[Garrett Cooper]

On Sat, Jan 17, 2009 at 11:40 PM,  <xorquewasp at googlemail.com> wrote:
> On 2009-01-17 23:07:29, Nate Eldredge wrote:
>> I tried a simple example of this in C++ and it works as expected.  (I am on
>> 7.0-RELEASE/amd64.)  So it isn't completely busted, at least.
>>
>> Can you post an example that exhibits the problem?  Ideally, something
>> complete that can be compiled and is as simple as possible.  If you can do
>> it with C++ rather than Ada it might be easier, so people don't have to
>> install the Ada compiler.  Also please mention the commands you use to
>> compile, and what they output when you compile using -v, and what
>> architecture you are on.
>
> Hello.
>
> You're right, the C++ example works here. I'm not sure why it didn't before.
>
> Here's a C++ version:
>
>  /* main.cpp */
>
>  #include <stdio.h>
>
>  extern "C" {
>    extern void
>    c_function (void (*func)(int x));
>  }
>
>  void
>  ext_function (int x)
>  {
>    printf ("-- ext_function %d\n", x);
>    throw "test_error";
>  }
>
>  int
>  main (void)
>  {
>    try {
>      c_function (&ext_function);
>    } catch (...) {
>      printf ("caught test_error\n");
>    }
>    return 0;
>  }
>
>  /* c_function.c */
>
>  #include <stdio.h>
>
>  void
>  c_function (void (*func)(int x))
>  {
>    printf ("-- %s enter\n", __func__);
>    func (23);
>    printf ("-- %s exit\n", __func__);
>  }
>
>  $ uname -smir
>  FreeBSD 6.4-RELEASE-p1 i386 GENERIC
>
>  $ gcc43 -v
>  Using built-in specs.
>  Target: i386-portbld-freebsd6.4
>  Configured with: ./..//gcc-4.3.2/configure --enable-languages=c,ada --disable-nls --with-system-zlib --with-libiconv-prefix=/usr/local --program-suffix=43 --bindir=/usr/local/bin/gcc43 --libdir=/usr/local/lib/gcc-4.3.2 --prefix=/usr/local --mandir=/usr/local/man --infodir=/usr/local/info/gcc43 --build=i386-portbld-freebsd6.4
>  Thread model: posix
>  gcc version 4.3.2 (GCC)
>
>  $ c++ -v
>  Using built-in specs.
>  Configured with: FreeBSD/i386 system compiler
>  Thread model: posix
>  gcc version 3.4.6 [FreeBSD] 20060305
>
>  $ gcc43 -o c_function.o -c c_function.c -fPIC -fexceptions -g -W -Werror -Wall -std=c99 -pedantic-errors -Wno-unused-parameter
>  $ gcc43 -shared -Wl,-soname,c_function.so -o c_function.so c_function.o -lc
>  $ c++ -o main.o -c main.cpp -fexceptions -g -W -Werror -Wall -pedantic-errors -Wno-unused-parameter
>  $ c++ -o main-dynamic main.o c_function.so
>  $ c++ -o main-static main.o c_function.o
>
>  $ ./main-static
>  -- c_function enter
>  -- ext_function 23
>  caught test_error
>  LD_LIBRARY_PATH=. ./main-dynamic
>  -- c_function enter
>  -- ext_function 23
>  caught test_error
>
> This example is problematic, however - the C++ compiler is 3.4.6
> (I'm not sure how to compile a 4.3.2 gcc with C, Ada and C++ support).

I'd check the release notes between 4.2.x and 4.3.x, and see whether
or not they invalidated a certain lexigraphical part of C++ that was a
gray area, which could be affecting your compilation. Have you
possibly discussed this very issue on the gcc lists yet?

Also, what CFLAGS / CXXFLAGS / CPUTYPE are you using?

Cheers,
-Garrett