dbus-daemon segfault under Solaris

[Pavel Strashkin]

I've attached the patch which fixes some issues related to Solaris platform:

- [remove duplicated code], cleanup

- [use -D_REENTRANT flag when Solaris detected], makes standard
functions be reentrant and errno thread-safe

- [don't use --gc-sections when Solaris detected], fix for SEGFAULT

- [use -D_XOPEN_SOURCE=500 flag when Solaris detected], this flag
enables required members of struct msghdr when UNIX FD passing is
possible

2010/12/20 Thiago Macieira <thiago at kde.org>:
> On Monday, 20 de December de 2010 14:40:49 Pavel Strashkin wrote:
>> Program received signal SIGSEGV, Segmentation fault.
>> 0x00000000 in ?? ()
>> (gdb) bt
>> #0  0x00000000 in ?? ()
>> #1  0xfed71680 in ?? () from /lib/libgcc_s.so.1
>> #2  0xfed713d5 in ?? () from /lib/libgcc_s.so.1
>> #3  0xfef863c6 in call_init () from /lib/ld.so.1
>> #4  0xfef852cb in setup () from /lib/ld.so.1
>> #5  0xfef9326c in _setup () from /lib/ld.so.1
>> #6  0xfef79694 in _rt_boot () from /lib/ld.so.1
>> #7  0x08047538 in ?? ()
>> #8  0x08047648 in ?? ()
>> Backtrace stopped: previous frame inner to this frame (corrupt stack?)
>
> Given the evidence above, I would guess that gc-sections removed the .init
> section from the library.
>
> Looking at the map file produced by the linker on Linux, I don't see anything
> coming from libdbus-1 in the init section. They come all from gcc itself.
>
> So I guess it's safe to remove the gc-sections option on Solaris, and probably
> everywhere where GNU ld isn't used.
>
> --
> Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
>  Senior Product Manager - Nokia, Qt Development Frameworks
>      PGP/GPG: 0x6EF45358; fingerprint:
>      E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358
>
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