[gdb/testsuite] Remove .debug_line.dwo from gdb.dwarf2/fission-multi-cu.S

Consider test-case gdb.dwarf2/fission-multi-cu.exp.  It produces an executable
fission-multi-cu and a dwo file fission-multi-cu.dwo.

The file fission-multi-cu.dwo contains a .debug_line.dwo section, which
according to the DWARF v5 standard is a "specialized line number table" for
type units in the .debug_info.dwo section, and contains only the directory and
filename lists.

When reading the actual .debug_line.dwo section using readelf -w, we get:
...
 The Directory Table is empty.

 The File Name Table is empty.

 No Line Number Statements.
...
So, the section does not contain any actual information.  Furthermore, no
information is required because the .debug_line.dwo section does not contain
any type units.

This is confirmed by:
- re-doing the commands listed at the start of fission-multi-cu.S, which were
  used as starting point for fission-multi-cu.S, and
- compiling the fission-multi-cu{1,2}.c files with clang -flto -g -gsplit-dwarf
In both cases, no .debug_line.dwo section is generated.

Remove the .debug_line.dwo section, to make it fit how split dwarf is actually
generated by clang.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2020-11-02  Tom de Vries  <tdevries@suse.de>

	* gdb.dwarf2/fission-multi-cu.S: Remove .debug_line.dwo section.

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 5d752d80acc310dcd256bf001de5c485348e4e4e..123d3454aca6233fb223e6c6cbe5ab0f9cdfca45 100644 (file)
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2020-11-02  Tom de Vries  <tdevries@suse.de>
+
+       * gdb.dwarf2/fission-multi-cu.S: Remove .debug_line.dwo section.
+
 2020-11-01  Joel Brobecker  <brobecker@adacore.com>
 
        * gdb.ada/fixed_points/fixed_points.adb: Replace use of

diff --git a/gdb/testsuite/gdb.dwarf2/fission-multi-cu.S b/gdb/testsuite/gdb.dwarf2/fission-multi-cu.S
index 171fa7158d9dd26096f49e89b0baf200d82808b0..cb021d501155b659f0382a5229640387ac1d1b93 100644 (file)
--- a/gdb/testsuite/gdb.dwarf2/fission-multi-cu.S
+++ b/gdb/testsuite/gdb.dwarf2/fission-multi-cu.S
@@ -311,20 +311,6 @@ main:                                   # @main
        .byte   0                       # EOM(1)
        .byte   0                       # EOM(2)
        .byte   0                       # EOM(3)
-       .section        .debug_line.dwo,"",@progbits
-.Ltmp4:
-       .long   (.Ltmp5-.Ltmp4)-4
-       .short  2
-       .long   (.Ltmp6-.Ltmp4)-10
-       .byte   1
-       .byte   1
-       .byte   -5
-       .byte   14
-       .byte   1
-       .byte   0
-       .byte   0
-.Ltmp6:
-.Ltmp5:
        .section        .debug_addr,"",@progbits
        .quad   .Lfunc_begin0
        .quad   .Lfunc_begin1