[Bug gdb/19711] 32-bit application linked with "-z now" causes GDB to fail stepping over/into lines (possibly because of R_386_GLOB_DAT)

["palves at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19711

Pedro Alves <palves at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |palves at redhat dot com

--- Comment #1 from Pedro Alves <palves at redhat dot com> ---
FWIW, I tried this on Fedora 23 with gdb 7.10.1, 7.11.1, and current gdb
master, and all worked correctly here.

$ make
g++ -m32 -g -fPIC -c main.cpp -o main.o
g++ -m32 -g -fPIC -c shared.cpp -o shared.o
g++ -m32 -g --shared -Wl,--gc-sections,--warn-shared-textrel -Wl,--no-undefined
 -o libshared.so -fPIC -Wl,-z,relro,-z,defs,--build-id shared.o -lc
-Wl,-no-whole-archive
g++ -m32 -g -o main main.o -z defs -z origin -z now
-Wl,--gc-sections,-rpath='RIGIN',--build-id,--warn-shared-textrel -fPIE -pie
-L. -lshared
[pedro@cascais][~/tmp/rel/rel]
$ readelf -r main 

Relocation section '.rel.dyn' at offset 0x450 contains 9 entries:
 Offset     Info    Type            Sym.Value  Sym. Name
00001e98  00000008 R_386_RELATIVE   
00001e9c  00000008 R_386_RELATIVE   
00001ea4  00000008 R_386_RELATIVE   
00001ffc  00000008 R_386_RELATIVE   
00001fe8  00000406 R_386_GLOB_DAT    00000000   __gmon_start__
00001fec  00000506 R_386_GLOB_DAT    00000000   _Jv_RegisterClasses
00001ff0  00000706 R_386_GLOB_DAT    00000000   _ITM_deregisterTMClone
00001ff4  00000806 R_386_GLOB_DAT    00000000   _ITM_registerTMCloneTa
00001ff8  00000b06 R_386_GLOB_DAT    00000000   __cxa_finalize

Relocation section '.rel.plt' at offset 0x498 contains 5 entries:
 Offset     Info    Type            Sym.Value  Sym. Name
00001fd4  00000407 R_386_JUMP_SLOT   00000000   __gmon_start__
00001fd8  00000607 R_386_JUMP_SLOT   00000000   __libc_start_main
00001fdc  00000907 R_386_JUMP_SLOT   00000000   printf
00001fe0  00000a07 R_386_JUMP_SLOT   00000000   _Z12do_somethingi
00001fe4  00000b07 R_386_JUMP_SLOT   00000000   __cxa_finalize


(gdb) start
Temporary breakpoint 1 at 0x6df: file main.cpp, line 8.
Starting program: /home/pedro/tmp/rel/rel/main 

Temporary breakpoint 1, main (argc=1, argv=0xffffcb04) at main.cpp:8
8         int x = do_something(argc);
(gdb) n
9         x = do_something(x);
(gdb) 
10        printf("All done: %d\n", x);
(gdb) 
All done: 4
11        return x;
(gdb)

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