[v2,5/5,gdb/symtab] Trust epilogue unwind info for unknown or non-gcc producer
Commit Message
Currently we only trust epilogue unwind info only for gcc >= 4.5.0.
This has the effect that we don't trust epilogue unwind info for:
- unknown producers (CU without DW_AT_producer attribute)
- non-gcc producers (say, clang).
Instead, only distrust epilogue unwind info only for gcc < 4.5.0.
---
gdb/dwarf2/read.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
@@ -8451,7 +8451,13 @@ process_full_comp_unit (dwarf2_cu *cu, enum language pretend_language)
if (cu->has_loclist && gcc_4_minor >= 5)
cust->set_locations_valid (true);
- if (gcc_4_minor >= 5)
+ int major, minor;
+ if (cu->producer != nullptr
+ && producer_is_gcc (cu->producer, &major, &minor)
+ && (major < 4 || (major == 4 && minor < 5)))
+ /* Don't trust gcc < 4.5.x. */
+ cust->set_epilogue_unwind_valid (false);
+ else
cust->set_epilogue_unwind_valid (true);
cust->set_call_site_htab (cu->call_site_htab);