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PR gcov-profile/7970 PR gcov-profile/16855 PR gcov-profile/44779 * g++.dg/gcov/pr16855.C: New test. * coverage.c (build_gcov_exit_decl): New function. (coverage_obj_init): Call the function and generate __gcov_exit destructor. * doc/gcov.texi: Document when __gcov_exit function is called. * libgcov-driver.c (__gcov_init): Do not register a atexit handler. (__gcov_exit): Rename from gcov_exit. * libgcov.h (__gcov_exit): Declare. From-SVN: r240529
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