Re: Patch to support AMD64 Solaris 10

[Andrew Cagney <cagney@gnu.org>]

Joseph S. Myers wrote:
> This patch adds initial support for Solaris 10 on AMD64.  The test results 
> (debugging both 64-bit and 32-bit binaries) are fairly similar to those 
> for unmodified GDB (built as 32-bit and debugging 32-bit binaries), though 
> as the prerelease operating system isn't yet fully reliable running the 
> GDB testsuite it's difficult to get full testsuite results for comparison.
> 
> The configuration is based on the existing IA32 Solaris support.

Sigh, this is unfortunatly adding a further use of a deprecated 
mechanism (DEPRECATED_TM_FILE) and a non strictly multi-arch port.  I 
assume it is largely for solib?

What about instead modifying things so that solib.c is always included 
and have it locally handle the legacy #ifdef SOLIB_ADD et.al. case?

> A limitation of this patch is that GDB needs to be built as a 64-bit 
> binary (configured with CC="gcc -m64": 32-bit compilation is the default 
> for this system) to work on AMD64 Solaris; GDB built as a 32-bit binary 
> doesn't work with this patch on AMD64 Solaris 10.  The problem is that 
> there is a single target triplet and so a single GDB configuration, but 
> 64-bit GDB should be using the functions in amd64-sol2-nat.c added by this 
> patch while 32-bit GDB (which in any case could only debug 32-bit 
> binaries, but the operating system does support plain x86 systems as well 
> as AMD64 ones, so such a GDB is desirable) should be using the functions 
> in i386v4-nat.c.  Any comments on the best approach for having the single 
> configuration cleanly support being built as both 32-bit and 64-bit?

The 64-bit PPC GNU/Linux developers have the same problem.

It's really a top-level configure / config.guess issue so best rasied 
there (gcc@?, config@?).  By the time things get to GDB it's too late - 
trying to switch to 'cc -m64' after the fact would leave us with BFD 
built 'cc -m32' but with GDB built 'cc -m64'.  Outch!

Andrew

PS: Suggest looking at inf-child and inf-ptrace.  The use of nm-*.h and 
macros to implement native configurations is also falling from favour.