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gold patch committed: Implement --unresolved-symbols
- From: Ian Lance Taylor <iant at google dot com>
- To: binutils at sourceware dot org
- Date: Fri, 08 Jul 2011 23:12:51 -0700
- Subject: gold patch committed: Implement --unresolved-symbols
This gold patch implements --unresolved-symbols more or less as it
exists in GNU ld. Gold generally acts as like GNU ld using
--unresolved-symbols=ignore-in-shared-libs, and this patch does not
change that behaviour. Committed to mainline.
Ian
2011-07-08 Ian Lance Taylor <iant@google.com>
PR gold/12386
* options.h (class General_options): Add --unresolved-symbols.
* target-reloc.h (issue_undefined_symbol_error): Check
--unresolved-symbols. Add comments.
Index: options.h
===================================================================
RCS file: /cvs/src/src/gold/options.h,v
retrieving revision 1.166
diff -u -p -r1.166 options.h
--- options.h 6 Jul 2011 22:15:12 -0000 1.166
+++ options.h 9 Jul 2011 06:09:34 -0000
@@ -1069,6 +1069,13 @@ class General_options
DEFINE_set(undefined, options::TWO_DASHES, 'u',
N_("Create undefined reference to SYMBOL"), N_("SYMBOL"));
+ DEFINE_enum(unresolved_symbols, options::TWO_DASHES, '\0', NULL,
+ N_("How to handle unresolved symbols"),
+ ("ignore-all,report-all,ignore-in-object-files,"
+ "ignore-in-shared-libs"),
+ {"ignore-all", "report-all", "ignore-in-object-files",
+ "ignore-in-shared-libs"});
+
DEFINE_bool(verbose, options::TWO_DASHES, '\0', false,
N_("Synonym for --debug=files"), NULL);
Index: target-reloc.h
===================================================================
RCS file: /cvs/src/src/gold/target-reloc.h,v
retrieving revision 1.48
diff -u -p -r1.48 target-reloc.h
--- target-reloc.h 9 Jul 2011 00:47:11 -0000 1.48
+++ target-reloc.h 9 Jul 2011 06:09:34 -0000
@@ -176,13 +176,46 @@ visibility_error(const Symbol* sym)
inline bool
issue_undefined_symbol_error(const Symbol* sym)
{
- return (sym != NULL
- && (sym->is_undefined() || sym->is_placeholder())
- && sym->binding() != elfcpp::STB_WEAK
- && !sym->is_defined_in_discarded_section()
- && !parameters->target().is_defined_by_abi(sym)
- && (!parameters->options().shared()
- || parameters->options().defs()));
+ // We only report global symbols.
+ if (sym == NULL)
+ return false;
+
+ // We only report undefined symbols.
+ if (!sym->is_undefined() && !sym->is_placeholder())
+ return false;
+
+ // We don't report weak symbols.
+ if (sym->binding() == elfcpp::STB_WEAK)
+ return false;
+
+ // We don't report symbols defined in discarded sections.
+ if (sym->is_defined_in_discarded_section())
+ return false;
+
+ // If the target defines this symbol, don't report it here.
+ if (parameters->target().is_defined_by_abi(sym))
+ return false;
+
+ // See if we've been told to ignore whether this symbol is
+ // undefined.
+ const char* const u = parameters->options().unresolved_symbols();
+ if (u != NULL)
+ {
+ if (strcmp(u, "ignore-all") == 0)
+ return false;
+ if (strcmp(u, "ignore-in-object-files") == 0 && !sym->in_dyn())
+ return false;
+ if (strcmp(u, "ignore-in-shared-libs") == 0 && !sym->in_reg())
+ return false;
+ }
+
+ // When creating a shared library, only report unresolved symbols if
+ // -z defs was used.
+ if (parameters->options().shared() && !parameters->options().defs())
+ return false;
+
+ // Otherwise issue a warning.
+ return true;
}
// This function implements the generic part of relocation processing.