Fix --dynamic-list so that symbols not in the list are still exported.

In PR 13577, the complaint was that -Bsymbolic was overriding the binding
behavior for symbols listed in the --dynamic-list by setting the DT_SYMBOLIC
tag in the dynamic table. In reading the Gnu ld manual, I decided that
--dynamic-list should be mutually exclusive of -Bsymbolic, and modified
gold so that --dynamic-list would treat symbols listed as preemptible,
and all other symbols as internally bound. I was wrong.

PR 16992 shows that with --dynamic-list (and not -Bsymbolic), a symbol
not listed in the dynamic list is being internally bound within the
shared library, but because it's still in the dynamic symbol table, we
expose it to a COPY relocation, and things go really bad from there.

(I can reproduce the same failure, simply by turning on -Bsymbolic-functions
with the Gnu linker. Even though the symbol is bound internally, it's
still exported to the dynamic symbol table, and is exposed to a COPY
relocation.)

I've backed out part of the fix for PR 13577, and -Bsymbolic (or
-Bsymbolic-functions) can now be used with --dynamic-list, but if the
two are used together, we do not set DT_SYMBOLIC or DF_SYMBOLIC
(this matches Gnu ld behavior). We now treat symbols listed in the
dynamic list as premptible, but we do not automatically treat symbols
not listed there as non-premptible.

gold/
	PR gold/13577
	PR gold/16992
	* layout.cc (Layout::finish_dynamic_section): Don't set DT_SYMBOLIC or
	DF_SYMBOLIC if --dynamic-list option is used.
	* options.cc (General_options::finalize): --dynamic-list is not
	mutually exclusive with -Bsymbolic.
	* symtab.h (Symbol::is_preemptible): Don't exclude dynamic symbols not
	listed in --dynamic-list.
	* testsuite/Makefile.am (dynamic_list_lib2.so): Add
	-Bsymbolic-functions.
	* testsuite/Makefile.in: Regenerate.

1 files changed, 0 insertions, 7 deletions

diff --git a/gold/options.cc b/gold/options.cc
index 7eb8f277108..7f1f69e0cec 100644
--- a/gold/options.cc
+++ b/gold/options.cc
@@ -1200,13 +1200,6 @@ General_options::finalize()
   // in the path, as appropriate.
   this->add_sysroot();
 
-  // --dynamic-list overrides -Bsymbolic and -Bsymbolic-functions.
-  if (this->have_dynamic_list())
-    {
-      this->set_Bsymbolic(false);
-      this->set_Bsymbolic_functions(false);
-    }
-
   // Now that we've normalized the options, check for contradictory ones.
   if (this->shared() && this->is_static())
     gold_fatal(_("-shared and -static are incompatible"));