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| author | Martin Liska <mliska@suse.cz> | 2021-09-09 13:02:24 +0200 |
|---|---|---|
| committer | Martin Liska <mliska@suse.cz> | 2021-10-13 15:26:58 +0200 |
| commit | 72e0c742bd01f8e7e6dcca64042b9ad7e75979de (patch) | |
| tree | b902a8580178ec7ed6d4dc9416679a4d92f81e78 /gcc/doc | |
| parent | 489c8f27296362dcfbc967aecef17ba7c5cab0f2 (diff) | |
| download | gcc-72e0c742bd01f8e7e6dcca64042b9ad7e75979de.zip gcc-72e0c742bd01f8e7e6dcca64042b9ad7e75979de.tar.gz gcc-72e0c742bd01f8e7e6dcca64042b9ad7e75979de.tar.bz2 | |
gcov: make profile merging smarter
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.
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index c4c6532..03234c8 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -14882,6 +14882,10 @@ supports locking, the data files will be correctly updated. Unless a strict ISO C dialect option is in effect, @code{fork} calls are detected and correctly handled without double counting. +Moreover, an object file can be recompiled multiple times +and the corresponding @file{.gcda} file merges as long as +the source file and the compiler options are unchanged. + @item For profile-directed optimizations, compile the source files again with the same optimization and code generation options plus |