[Bug debug/68904] DWARF for class ios_base says it's a declaration
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68904 ivan.soleimanipour at oracle dot com changed: What|Removed |Added CC||ivan.soleimanipour at oracle dot c ||om --- Comment #5 from ivan.soleimanipour at oracle dot com --- I see now why Andrew was asking the questions he was asking. What we failed to notice is that the definition of ios_base in t.o is abbreviated. It contains only nested classes, 'static const' members and typedefs. There is no member function or data member information. There is a more complete definition in `libstdc++.so.6.0.18. So now the questions become: - How does gcc decide to emit this abbreviated form? - Why is it then not _fully_ abbreviated? Why bother with the typedefs and such? FWIW -fno-eliminate-unused-debug-types seems to make no difference.
[Bug debug/68904] DWARF for class ios_base says it's a declaration
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68904 --- Comment #4 from chihin ko --- (In reply to Andrew Pinski from comment #1) > Can you try: > -fno-eliminate-unused-debug-types > > I bet the full type debug info is going to be emitted in a different TU > which is why GCC is not emitting it here. > > > Also look at the debug info inside libstdc++.so/libstdc++.a to see if the > full debug info is emitted there. The problem is for class "ios_base", the attribute DW_AT_declaration yes(1) should not be there, because the full definition of the class is here: < 2><0xb0f9> DW_TAG_class_type DW_AT_name "ios_base" DW_AT_declaration yes(1) <=== should not have this DW_AT_sibling <0xb4ab> < 3><0xb103>DW_TAG_enumeration_type DW_AT_name "event" DW_AT_byte_size0x0004 DW_AT_decl_file0x0025 /pkg/gnu/include/c++/4.9.3/bits/ios_base .h DW_AT_decl_line0x01a3 DW_AT_sibling <0xb123> < 4><0xb110> DW_TAG_enumerator DW_AT_name "erase_event" DW_AT_const_value 0x
[Bug debug/68904] DWARF for class ios_base says it's a declaration
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68904 --- Comment #3 from chihin ko --- Created attachment 37033 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37033&action=edit dwarf dump of test case test.cc
[Bug debug/68904] DWARF for class ios_base says it's a declaration
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68904 --- Comment #2 from chihin ko --- Created attachment 37032 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37032&action=edit test case
[Bug debug/68904] DWARF for class ios_base says it's a declaration
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68904 --- Comment #1 from Andrew Pinski --- Can you try: -fno-eliminate-unused-debug-types I bet the full type debug info is going to be emitted in a different TU which is why GCC is not emitting it here. Also look at the debug info inside libstdc++.so/libstdc++.a to see if the full debug info is emitted there.
