72e0c742bd
Support merging of profiles that are built from a different .o files but belong to the same source file. Moreover, a checksum is verified during profile merging and so we can safely combine such profile. PR gcov-profile/90364 gcc/ChangeLog: * coverage.c (build_info): Emit checksum to the global variable. (build_info_type): Add new field for checksum. (coverage_obj_finish): Pass object_checksum. (coverage_init): Use 0 as checksum for .gcno files. * gcov-dump.c (dump_gcov_file): Dump also new checksum field. * gcov.c (read_graph_file): Read also checksum. * doc/invoke.texi: Document the behaviour change. libgcc/ChangeLog: * libgcov-driver.c (merge_one_data): Skip timestamp and verify checksums. (write_one_data): Write also checksum. * libgcov-util.c (read_gcda_file): Read also checksum field. * libgcov.h (struct gcov_info): Add new field.
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