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gcov: Fix use of profile info section

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If the -fprofile-info-section is used, then the gcov information is registered
in a linker set.  This is done by build_gcov_info_var_registration().  The
compiler generated object placed in the section was not marked as referenced,
so once optimization was enabled, this object was optimized away.  Mark it as
referenced.

gcc/
	* coverage.c (build_gcov_info_var_registration): Mark the object placed
	in the linker set as referenced so that it does not get optimized away.
This commit is contained in:
Sebastian Huber 2021-07-14 09:40:11 +02:00
parent e0335bb7d1
commit f8884b9c51
1 changed files with 2 additions and 0 deletions
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2
gcc/coverage.c
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@ -50,6 +50,7 @@ along with GCC; see the file COPYING3. If not see
#include "auto-profile.h"
#include "profile.h"
#include "diagnostic.h"
#include "varasm.h"
#include "gcov-io.c"
@ -1121,6 +1122,7 @@ build_gcov_info_var_registration (tree gcov_info_type)
DECL_NAME (var) = get_identifier (name_buf);
get_section (profile_info_section, SECTION_UNNAMED, NULL);
set_decl_section_name (var, profile_info_section);
mark_decl_referenced (var);
DECL_INITIAL (var) = build_fold_addr_expr (gcov_info_var);
varpool_node::finalize_decl (var);
}