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Scan all input files for symbol reference warning

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This patch scans all input files for symbol reference warning if the
symbol reference doesn't exist in the current input file.

ld/

	PR ld/16756
	* ldmain.c (symbol_warning): New function.
	(warning_callback): Use it.  Scan all input files for a reference
	to SYMBOL.

ld/testsuite/

	PR ld/16756
	* ld-plugin/lto.exp: Expect filename and line number for PR
	ld/12760 test.
This commit is contained in:
H.J. Lu
2014-03-26 12:18:59 -07:00
parent 6a631e86cf
commit 4c6d802e59
4 changed files with 71 additions and 49 deletions
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43
ld/ldmain.c
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@@ -1150,6 +1150,25 @@ struct warning_callback_info
asymbol **asymbols;
};
/* Look through the relocs to see if we can find a plausible address
for SYMBOL in ABFD. Return TRUE if found. Otherwise return FALSE. */
static bfd_boolean
symbol_warning (const char *warning, const char *symbol, bfd *abfd)
{
struct warning_callback_info cinfo;
if (!bfd_generic_link_read_symbols (abfd))
einfo (_("%B%F: could not read symbols: %E\n"), abfd);
cinfo.found = FALSE;
cinfo.warning = warning;
cinfo.symbol = symbol;
cinfo.asymbols = bfd_get_outsymbols (abfd);
bfd_map_over_sections (abfd, warning_find_reloc, &cinfo);
return cinfo.found;
}
/* This is called when there is a reference to a warning symbol. */
static bfd_boolean
@@ -1172,24 +1191,14 @@ warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
einfo ("%P: %s%s\n", _("warning: "), warning);
else if (symbol == NULL)
einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
else
else if (! symbol_warning (warning, symbol, abfd))
{
struct warning_callback_info cinfo;
/* Look through the relocs to see if we can find a plausible
address. */
if (!bfd_generic_link_read_symbols (abfd))
einfo (_("%B%F: could not read symbols: %E\n"), abfd);
cinfo.found = FALSE;
cinfo.warning = warning;
cinfo.symbol = symbol;
cinfo.asymbols = bfd_get_outsymbols (abfd);
bfd_map_over_sections (abfd, warning_find_reloc, &cinfo);
if (! cinfo.found)
einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
bfd *b;
/* Search all input files for a reference to SYMBOL. */
for (b = info->input_bfds; b; b = b->link_next)
if (b != abfd && symbol_warning (warning, symbol, b))
return TRUE;
einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
}
return TRUE;