Working on the GNAT multi-source compile feature (see http://gcc.gnu.org/ml/gcc/2009-04/msg00380.html),
I am running into crashes in ggc_collect() on compiling the 2nd file in the compile job. Following the advice given in http://gcc.gnu.org/ml/gcc/2004-04/msg00901.html , I configured GCC with --enable-gcac. As a result, the crash no longer happens in ggc-page.c function lookup_page_table_entry (at the line "return base[L1][L2];") but instead happens in validate_free_objects, at the line /* Make certain it isn't visible from any root. Notice that we do this check before sweep_pages merges save_in_use_p. */ gcc_assert (!(pe->in_use_p[word] & (1UL << bit))); The backtrace using trunk 20090807 is: #7 0x0852f5bf in fancy_abort (file=0x8c734ca "../../gcc/gcc/ggc-page.c["00"]", line=1888, function=0x8c7354f "validate_free_objects["00"]") at ../../gcc/gcc/diagnostic.c:730 #8 0x084c5d5b in validate_free_objects () at ../../gcc/gcc/ggc-page.c:1888 #9 0x084c5ec7 in ggc_collect () at ../../gcc/gcc/ggc-page.c:1949 #10 0x088eb317 in cgraph_finalize_function (decl=0xb6824e00, nested=0 '["00"]') at ../../gcc/gcc/cgraphunit.c:550 #11 0x087403fe in finalize_size_functions () at ../../gcc/gcc/stor-layoutc:366 #12 0x088ec3c5 in cgraph_finalize_compilation_unit () at ../../gcc/gcc/cgraphunit.c:1034 #13 0x08167a73 in gnat_write_global_declarations () at ../../gcc/gcc/ada/gcc-interface/utils.c:4671 #14 0x0874a198 in compile_file () at ../../gcc/gcc/toplev.c:1044 #15 0x0874bfd4 in do_compile () at ../../gcc/gcc/toplev.c:2387 #16 0x0874c0f0 in toplev_main (argc=25, argv=0xbfe6faa4) at ../../gcc/gcc/toplev.c:2445 #17 0x084c460a in main (argc=148423232, argv=0x8c105b0) at ../../gcc/gcc/main.c:35 I am stuck here, i.e. I don't know how to find the code that is at fault. Is there some way to trace a pointer entered in G.free_object_list back to its origin in the code? Thanks, Oliver Heute schon ge"freeMail"t? Jetzt kostenlose E-Mail-Adresse sichern! http://email.freenet.de/dienste/emailoffice/produktuebersicht/basic/mail/index.html?pid=6831
