[Bug symtab/28108] [gcc-11] FAIL: gdb.base/langs.exp: up to foo in langs.exp

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28108

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
With -gdwarf-4, we have:
...
 <0><243>: Abbrev Number: 1 (DW_TAG_compile_unit)
    <244>   DW_AT_producer    : (indirect string, offset: 0x208): GNU C17
11.1.1 20210625 [revision 62bbb113ae68a7e724255e17143520735bcb9ec9]
-mtune=generic -march=x86-64 -gdwarf-4 -fno-stack-protector
    <248>   DW_AT_language    : 12      (ANSI C99)
    <249>   DW_AT_name        : (indirect string, offset: 0x34d):
/home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.base/langs2.c
    <24d>   DW_AT_comp_dir    : (indirect string, offset: 0x1d0):
/home/vries/gdb_versions/devel/build/gdb/testsuite
    <251>   DW_AT_low_pc      : 0x400502
    <259>   DW_AT_high_pc     : 0x3b
    <261>   DW_AT_stmt_list   : 0x20f
...
and at 0x20f:
...
 The Directory Table is empty.

 The File Name Table (offset 0x22c):
  Entry Dir     Time    Size    Name
  1     0       0       0       langs2.cxx

...

With -gdwarf-5, we have:
...
 <0><242>: Abbrev Number: 2 (DW_TAG_compile_unit)
    <243>   DW_AT_producer    : (indirect string, offset: 0x1d0): GNU C17
11.1.1 20210625 [revision 62bbb113ae68a7e724255e17143520735bcb9ec9]
-mtune=generic -march=x86-64 -gdwarf-5 -fno-stack-protector
    <247>   DW_AT_language    : 29      (C11)
    <248>   DW_AT_name        : (indirect line string, offset: 0xfc):
/home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.base/langs2.c
    <24c>   DW_AT_comp_dir    : (indirect line string, offset: 0x0):
/home/vries/gdb_versions/devel/build/gdb/testsuite
    <250>   DW_AT_low_pc      : 0x400502
    <258>   DW_AT_high_pc     : 0x3b
    <260>   DW_AT_stmt_list   : 0x1b4
...
and at 0x1b4:
...
 The Directory Table (offset 0x1d6, lines 1, columns 1):
  Entry Name
  0     (indirect line string, offset: 0x0):
/home/vries/gdb_versions/devel/build/gdb/testsuite

 The File Name Table (offset 0x1e0, lines 2, columns 2):
  Entry Dir     Name
  0     0       (indirect line string, offset: 0xfc):
/home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.base/langs2.c
  1     0       (indirect line string, offset: 0x13f): langs2.cxx
...

So the difference seems to be that the directory and file entries 0 are
implicit in dwarf-4, and explicit in dwarf-5.

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