[Bug ld/23357] LD debug info cannot be read by valgrind

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23357

--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> ---
Here is a tiny program:

https://github.com/hjl-tools/simple-linux/tree/divide-by-zero

Valgrind can't read its DWARF debug info:

address@hidden simple-linux]$ make LD=ld.gold
gcc -g -O0   -c -o test.o test.c
test.c: In function \u2018main\u2019:
test.c:22:9: warning: division by zero [-Wdiv-by-zero]
   i = 7 / 0;
         ^
gcc -g   -c -o start.o start.S
gcc -g   -c -o syscall.o syscall.S
ld.gold  -o test test.o start.o syscall.o
./test hello world
a
make: *** [Makefile:12: all] Floating point exception
address@hidden simple-linux]$ valgrind ./test
==27555== Memcheck, a memory error detector
==27555== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==27555== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info
==27555== Command: ./test
==27555== 
a
==27555== 
==27555== Process terminating with default action of signal 8 (SIGFPE)
==27555==  Integer divide by zero at address 0x1002B95532
==27555==    at 0x40015E: ??? (in /export/ssd/git/github/simple-linux/test)
==27555==    by 0x4001A8: ??? (in /export/ssd/git/github/simple-linux/test)
==27555== 
==27555== HEAP SUMMARY:
==27555==     in use at exit: 0 bytes in 0 blocks
==27555==   total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==27555== 
==27555== All heap blocks were freed -- no leaks are possible
==27555== 
==27555== For counts of detected and suppressed errors, rerun with: -v
==27555== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
Floating point exception
address@hidden simple-linux]$ gdb test
GNU gdb (GDB) Fedora 8.1-19.fc28
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
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<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
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Reading symbols from test...done.
(gdb) r
Starting program: /export/ssd/git/github/simple-linux/test 
a

Program received signal SIGFPE, Arithmetic exception.
0x000000000040015c in main (argc=1, argv=0x7fffffffd708) at test.c:22
22        i = 7 / 0;
(gdb)

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