https://sourceware.org/bugzilla/show_bug.cgi?id=16910
Bug ID: 16910
Summary: Failed to relocate attributes of debug information
when the sym is wrapped
Product: binutils
Version: 2.25 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: qiyao at gcc dot gnu.org
We find this bug when we run gdb test gdb.dwarf2/dwz.exp. Here are the steps
to reproduce this bug:
1. Compile and link
$ gcc 1.c -c -o 1.o
$ gcc 2.c -c -o 2.o
$ gcc dwz.S -c -o dwz.o
$ build-x86/ld/ld-new 1.o dwz.o 2.o --wrap main -o 1.exe
2. Examine the address of main and __wrap_main
$ readelf -s 1.exe | grep main
10: 08048088 18 FUNC GLOBAL DEFAULT 1 __wrap_main
12: 08048074 20 FUNC GLOBAL DEFAULT 1 main
3. Examine the DW_AT_low_pc attribute for main,
$ readelf -wi ./1.exe
Contents of the .debug_info section:
Compilation Unit @ offset 0x0:
Length: 0x17 (32-bit)
Version: 4
Abbrev Offset: 0x0
Pointer Size: 4
<0><b>: Abbrev Number: 2 (DW_TAG_partial_unit)
<1><c>: Abbrev Number: 3 (DW_TAG_subprogram)
<d> DW_AT_name : main
<12> DW_AT_low_pc : 0x8048088 <------- [1]
<16> DW_AT_high_pc : 0x8048092
As we can see, DW_AT_low_pc should be the address of main instead of
__wrap_main, otherwise, GDB will be confused. We find this problem on both x86
and arm targets.
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