Help to fix FTBS on IA64 - save the frame pointer
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Hello fellow IA64 porters,
please CC me, I'm not subscribed to debian-ia64. I'd like to ask you for
assistance for a porting issue I discovered. The last upload of my
package "trafficserver" failed to build from source on IA64. The build
log can be found on [1]. This is a snippet of the corresponding code [2][3]:
struct sigcontext *scxt;
#if defined(__i386__)
asm volatile ("movl %%ebp,%0":"=r" (fp));
#elif defined(__x86_64__)
asm volatile ("mov %%rbp,%0":"=r" (fp));
#elif defined(__arm__)
asm volatile ("mov %%r9,%0":"=r" (fp));
#endif
...
// more architecture dependent stuff later
The problem is obviously that gcc 4.6 enabled
- -Werror=unused-but-set-variable (whereas gcc 4.4 before probably
didn't), which caused the FTBS on IA64 now. The preprocessor directives
produce no architecture-dependent code for IA64, which makes the
variable indeed to be unused on IA64.
That's not the actual problem, of course. The problem is, the code is a
no-op on IA64. The basic idea is to save and restore the frame pointer.
However I have no clue about IA64's ABI calling conventions and I have
no access to a IA64 machine to eventually test patches, so I'm a bit
lost here. That's why I am asking for assitance.
Previously the package built fine on IA64 after I ported some minor
problems. However the package was/is probably not functional with
respect to this piece of code, which compiled to a no-op function just
fine before.
[1]
https://buildd.debian.org/status/fetch.php?pkg=trafficserver&arch=ia64&ver=3.0.1-1&stamp=1313026983
[2]
http://svn.apache.org/viewvc/trafficserver/traffic/trunk/lib/ts/ink_stack_trace.cc?view=markup
[3]
https://alioth.debian.org/scm/viewvc.php/ext-maint/trafficserver/trunk/lib/ts/ink_stack_trace.cc?view=markup&root=collab-maint
- --
with kind regards,
Arno Töll
IRC: daemonkeeper on Freenode/OFTC
GnuPG Key-ID: 0x9D80F36D
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