gdb/gdb-bz631575-gdb-index-nobits.patch

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http://sourceware.org/ml/gdb-patches/2010-09/msg00183.html
Subject: [patch] .gdb_index: Do not crash on NOBITS
Hi,
elfutils-0.148 still do not contain patch of its GIT
804e9ca4d644e64a6125307cbf0a0b89477d7611 where the .gdb_index section has been
also split into the separate debug info file.
Due to it binaries split using elfutils-0.148 contain
[38] .gdb_index NOBITS 0000000000000000 0000338c
instead of expected
[28] .gdb_index PROGBITS 0000000000000000 0000211c
and due to it GDB while reading the file can error() by:
Reading symbols from x.debug...Dwarf Error: Can't read DWARF data from 'x.debug'
which should not be fatal but due to some other bugs therein it can crash GDB.
The wrong separate debug info file is for example:
http://kojipkgs.fedoraproject.org/packages/glibc/2.12.90/10/x86_64/glibc-debuginfo-2.12.90-10.x86_64.rpm
/usr/lib/debug/lib64/libutil-2.12.90.so.debug
OK to check-in?
It does not attempt to use .gdb_index from the main binary, it will just
disable .gdb_index usage on these binaries.
Thanks,
Jan
http://sourceware.org/ml/gdb-cvs/2010-09/msg00062.html
### src/gdb/ChangeLog 2010/09/08 19:09:42 1.12162
### src/gdb/ChangeLog 2010/09/08 19:49:28 1.12163
## -1,3 +1,7 @@
+2010-09-08 Jan Kratochvil <jan.kratochvil@redhat.com>
+
+ * dwarf2read.c (dwarf2_read_index): Return on no SEC_HAS_CONTENTS.
+
2010-09-08 Daniel Jacobowitz <dan@codesourcery.com>
* dwarf2read.c (read_structure_type): Move processing of
--- src/gdb/dwarf2read.c 2010/09/08 19:09:42 1.452
+++ src/gdb/dwarf2read.c 2010/09/08 19:49:28 1.453
@@ -1904,6 +1904,13 @@
if (dwarf2_per_objfile->gdb_index.asection == NULL
|| dwarf2_per_objfile->gdb_index.size == 0)
return 0;
+
+ /* Older elfutils strip versions could keep the section in the main
+ executable while splitting it for the separate debug info file. */
+ if ((bfd_get_file_flags (dwarf2_per_objfile->gdb_index.asection)
+ & SEC_HAS_CONTENTS) == 0)
+ return 0;
+
dwarf2_read_section (objfile, &dwarf2_per_objfile->gdb_index);
addr = dwarf2_per_objfile->gdb_index.buffer;