Re: Crash with new-style exceptions on FreeBSD amd64

[Michael Gardner]

On 3/15/07, Andrew Pinski <address@hidden> wrote:
> On 3/15/07, Michael Gardner <address@hidden> wrote:
> > That bug's description doesn't seem to match the symptoms I'm seeing,
> > and it's reported against gcc 4.3 rather than 4.1.
>
> For one, it is the same symptom, in that we are not linking against
> the shared libgcc which the driver does automatically for objective-C
> files if it is sees a .m.
>
> Try adding -shared-libgcc to the link line and see if that works.
>
> Again what is the ouput of ldd because that will tell me what is
> really happening?

Adding -shared-libgcc to the link step worked! It looks to me like
both versions are using the same libgcc, except in the first case
libgcc is listed before libc:

$ gcc41 -shared-libgcc -fobjc-exceptions -fexceptions
-L$GNUSTEP_SYSTEM_ROOT/Library/Libraries -lobjc -lgnustep-base -o
main-with-shared-libgcc main.o
$ ./main-with-shared-libgcc
caught!
$ ldd main-with-shared-libgcc
main-with-shared-libgcc:
       libobjc.so.1 => /usr/local/lib/gcc-4.1.3/libobjc.so.1 (0x800631000)
       libgnustep-base.so.1.13 =>
/usr/local/GNUstep/System/Library/Libraries/libgnustep-base.so.1.13
(0x80074c000)
       libgcc_s.so.1 => /usr/local/lib/gcc-4.1.3/libgcc_s.so.1 (0x800c94000)
       libc.so.6 => /lib/libc.so.6 (0x800da0000)
       libgmp.so.7 => /usr/local/lib/libgmp.so.7 (0x800fb1000)
       libxslt.so.2 => /usr/local/lib/libxslt.so.2 (0x8010eb000)
       libxml2.so.5 => /usr/local/lib/libxml2.so.5 (0x801221000)
       libz.so.3 => /lib/libz.so.3 (0x801462000)
       libiconv.so.3 => /usr/local/lib/libiconv.so.3 (0x801576000)
       libm.so.4 => /lib/libm.so.4 (0x801767000)
       libkvm.so.3 => /lib/libkvm.so.3 (0x801883000)

$ gcc41 -fobjc-exceptions -fexceptions
-L$GNUSTEP_SYSTEM_ROOT/Library/Libraries -lobjc -lgnustep-base -o
main-no-shared-libgcc main.o
$ ./main-no-shared-libgcc
Abort trap: 6 (core dumped)
$ ldd main-no-shared-libgcc
main-no-shared-libgcc:
       libobjc.so.1 => /usr/local/lib/gcc-4.1.3/libobjc.so.1 (0x800635000)
       libgnustep-base.so.1.13 =>
/usr/local/GNUstep/System/Library/Libraries/libgnustep-base.so.1.13
(0x800750000)
       libc.so.6 => /lib/libc.so.6 (0x800c98000)
       libgcc_s.so.1 => /usr/local/lib/gcc-4.1.3/libgcc_s.so.1 (0x800ea9000)
       libgmp.so.7 => /usr/local/lib/libgmp.so.7 (0x800fb5000)
       libxslt.so.2 => /usr/local/lib/libxslt.so.2 (0x8010ef000)
       libxml2.so.5 => /usr/local/lib/libxml2.so.5 (0x801225000)
       libz.so.3 => /lib/libz.so.3 (0x801466000)
       libiconv.so.3 => /usr/local/lib/libiconv.so.3 (0x80157a000)
       libm.so.4 => /lib/libm.so.4 (0x80176b000)
       libkvm.so.3 => /lib/libkvm.so.3 (0x801887000)

-Michael