From: Andi Kleen <a...@linux.intel.com>
When profiling is disabled force DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT
for each function to one. This information is then preserved
through LTO.
With this patch for LTO builds -pg needs to be set on both the
LTO final link and the original source build, to allow -pg
(or -pg -fentry) to be active for that source file. This allows
to build large projects mostly with -pg, except for a few files,
and still use LTO.
Originally suggested by Richard Biener
Passes bootstrap and testing on x86_64-linux.
gcc/:
2014-09-11 Andi Kleen <a...@linux.intel.com>
* function.c (allocate_struct_function): Force
DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT to zero when
profiling is disabled.
---
gcc/function.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/gcc/function.c b/gcc/function.c
index c8daf95..f07fdcf 100644
--- a/gcc/function.c
+++ b/gcc/function.c
@@ -4555,6 +4555,9 @@ allocate_struct_function (tree fndecl, bool abstract_p)
but is this worth the hassle? */
cfun->can_throw_non_call_exceptions = flag_non_call_exceptions;
cfun->can_delete_dead_exceptions = flag_delete_dead_exceptions;
+
+ if (!profile_flag && !flag_instrument_function_entry_exit)
+ DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (fndecl) = 1;
}
}
--
2.1.0
