Fix symbol values and relocation addends for relocatable links.

The fix for PR 19291 broke some other cases where -r is used with scripts,
as reported in PR 22266. The original fix for PR 22266 ended up breaking
many cases for REL targets, where the addends are stored in the section data,
and are not being adjusted properly.

The problem was basically that in a relocatable output file (ET_REL),
symbol values are supposed to be relative to the start address of their
section. Usually in a relocatable file, all sections start at 0, so the
failure to get this right is often irrelevant, but with a linker script,
we occasionally see an output section whose starting address is not 0,
and gold would occasionally write a symbol with its relocated value instead
of its section-relative value.

This patch reverts the recent fix for PR 22266 as well as my original fix
for PR 19291. The original fix moved the symbol value adjustment to
write_local_symbols, but neglected to undo a few places where the adjustment
was also being applied, resulting in an occasional double adjustment. The
more recent fix removed those other adjustments, but then failed to
re-account for the adjustment when rewriting the relocations on REL targets.

With the old attempts reverted, we now apply the symbol value adjustment to
the one case that had been missed (non-section symbols in merge sections).
But now we also need to account for the adjustment when rewriting the addends
for RELA relocations.

gold/
	PR gold/19291
	PR gold/22266
	* object.cc (Sized_relobj_file::compute_final_local_value_internal):
	Revert changes from 2017-11-08 patch.  Adjust symbol value in
	relocatable links for non-section symbols.
	(Sized_relobj_file::compute_final_local_value): Revert changes from
	2017-11-08 patch.
	(Sized_relobj_file::do_finalize_local_symbols): Likewise.
	(Sized_relobj_file::write_local_symbols): Revert changes from
	2015-11-25 patch.
	* object.h (Sized_relobj_file::compute_final_local_value_internal):
	Revert changes from 2017-11-08 patch.
	* powerpc.cc (Target_powerpc::relocate_relocs): Adjust addend for
	relocatable links.
	* target-reloc.h (relocate_relocs): Adjust addend for relocatable links.
	* testsuite/pr22266_a.c (hello): New function.
	* testsuite/pr22266_main.c (main): Add test for merge sections.
	* testsuite/pr22266_script.t: Add rule for .rodata.

1 files changed, 3 insertions, 1 deletions

diff --git a/gold/object.h b/gold/object.h
index c6c4927..508e79c 100644
--- a/gold/object.h
+++ b/gold/object.h
@@ -2772,7 +2772,8 @@ class Sized_relobj_file : public Sized_relobj<size, big_endian>
   // LV_IN points to a local symbol value containing the input value.
   // LV_OUT points to a local symbol value storing the final output value,
   // which must not be a merged symbol value since before calling this
-  // method to avoid memory leak.  OUT_SECTIONS is an array of output
+  // method to avoid memory leak.  RELOCATABLE indicates whether we are
+  // linking a relocatable output.  OUT_SECTIONS is an array of output
   // sections.  OUT_OFFSETS is an array of offsets of the sections.  SYMTAB
   // points to a symbol table.
   //
@@ -2784,6 +2785,7 @@ class Sized_relobj_file : public Sized_relobj<size, big_endian>
   compute_final_local_value_internal(unsigned int r_sym,
 				     const Symbol_value<size>* lv_in,
 				     Symbol_value<size>* lv_out,
+				     bool relocatable,
 				     const Output_sections& out_sections,
 				     const std::vector<Address>& out_offsets,
 				     const Symbol_table* symtab);