https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97461
--- Comment #17 from Martin Liška <marxin at gcc dot gnu.org> ---
Or I may have a smarter trick: let's do dry run of malloc/free functions early
in __gcov_init. Can you please test the patch as well?
commit d80cecdb87d159f0b3a4072b6e1ef80515ad2afb
Author: Martin Liska <mli...@suse.cz>
Date: Thu Oct 29 19:52:37 2020 +0100
PGO: use dry run of malloc and free functions.
diff --git a/libgcc/libgcov-driver.c b/libgcc/libgcov-driver.c
index e53e4dc392a..dd481b48e22 100644
--- a/libgcc/libgcov-driver.c
+++ b/libgcc/libgcov-driver.c
@@ -608,12 +608,25 @@ __gcov_exit (void)
gcov_error_exit ();
}
+/* Test memory that forces malloc and free functions to be called early
+ so that allocate_gcov_kvp can use calloc. Indirect call counters
+ taken from a pre-allocated array are used before that. */
+char *__gcov_test_memory;
+
/* Add a new object file onto the bb chain. Invoked automatically
when running an object file's global ctors. */
void
__gcov_init (struct gcov_info *info)
{
+ static int malloc_utilized = 0;
+ if (!malloc_utilized)
+ {
+ __gcov_test_memory = malloc (16);
+ free (__gcov_test_memory);
+ malloc_utilized = 1;
+ }
+
if (!info->version || !info->n_functions)
return;
if (gcov_version (info, info->version, 0))
