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as: Automatically enable DWARF5 support

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Currently

$ as -o x.o x.s

fails when x.s contains DWARF5 ".file 0" or ".loc 0" directives.  Update
assembler to automatically enable DWARF5 support so that

$ gcc -S -g -c x.c
$ gcc -c x.s

works.

	PR gas/27195
	* dwarf2dbg.c (dwarf2_gen_line_info): Set dwarf_level to 5 if
	needed.
	(dwarf2_directive_filename): Likewise.
	(dwarf2_directive_loc): Likewise.
	* testsuite/gas/elf/dwarf-5-file0.d: Pass --gdwarf-3.
	* testsuite/gas/lns/lns-diag-1.l: Remove the
	"Error: file number less than one" errors.
This commit is contained in:
H.J. Lu
2021-01-18 06:25:05 -08:00
parent 6a9ad81c44
commit 705989f19a
4 changed files with 30 additions and 9 deletions
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24
gas/dwarf2dbg.c
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@@ -551,7 +551,11 @@ dwarf2_gen_line_info (addressT ofs, struct dwarf2_line_info *loc)
if (loc->line == 0)
return;
if (loc->filenum == 0 && DWARF2_LINE_VERSION < 5)
return;
{
dwarf_level = 5;
if (DWARF2_LINE_VERSION < 5)
return;
}
/* Don't emit sequences of line symbols for the same line when the
symbols apply to assembler code. It is necessary to emit
@@ -1044,9 +1048,13 @@ dwarf2_directive_filename (void)
if ((offsetT) num < 1 && DWARF2_LINE_VERSION < 5)
{
as_bad (_("file number less than one"));
ignore_rest_of_line ();
return NULL;
dwarf_level = 5;
if (DWARF2_LINE_VERSION < 5)
{
as_bad (_("file number less than one"));
ignore_rest_of_line ();
return NULL;
}
}
/* FIXME: Should we allow ".file <N>\n" as an expression meaning
@@ -1143,8 +1151,12 @@ dwarf2_directive_loc (int dummy ATTRIBUTE_UNUSED)
{
if (filenum != 0 || DWARF2_LINE_VERSION < 5)
{
as_bad (_("file number less than one"));
return;
dwarf_level = 5;
if (DWARF2_LINE_VERSION < 5)
{
as_bad (_("file number less than one"));
return;
}
}
}