re PR target/67834 (Local references inside comdat groups)

	PR target/67834
	* config/pa/pa.c (pa_elf_select_rtx_section): New.  Put references to
	COMDAT group function labels in .data.rel.ro.local section.
	* config/pa/pa32-linux.h (TARGET_ASM_SELECT_RTX_SECTION): Define.

From-SVN: r279823

gcc/ChangeLog

 2020-01-01  John David Anglin  <danglin@gcc.gnu.org>
 
+	PR target/67834
+	* config/pa/pa.c (pa_elf_select_rtx_section): New.  Put references to
+	COMDAT group function labels in .data.rel.ro.local section.
+	* config/pa/pa32-linux.h (TARGET_ASM_SELECT_RTX_SECTION): Define.
+
 	PR target/93111
 	* config/pa/pa.md (scc): Use ordered_comparison_operator instead of
 	comparison_operator in B and S integer comparisons.  Likewise, use

gcc/config/pa/pa.c

@@ -203,6 +203,7 @@ static bool pa_hard_regno_mode_ok (unsigned int, machine_mode);
 static bool pa_modes_tieable_p (machine_mode, machine_mode);
 static bool pa_can_change_mode_class (machine_mode, machine_mode, reg_class_t);
 static HOST_WIDE_INT pa_starting_frame_offset (void);
+static section* pa_elf_select_rtx_section(machine_mode, rtx, unsigned HOST_WIDE_INT) ATTRIBUTE_UNUSED;
 
 /* The following extra sections are only used for SOM.  */
 static GTY(()) section *som_readonly_data_section;
@@ -9838,6 +9839,26 @@ pa_select_section (tree exp, int reloc,
     return data_section;
 }
 
+/* Implement pa_elf_select_rtx_section.  If X is a function label operand
+   and the function is in a COMDAT group, place the plabel reference in the
+   .data.rel.ro.local section.  The linker ignores references to symbols in
+   discarded sections from this section.  */
+   
+static section *
+pa_elf_select_rtx_section (machine_mode mode, rtx x,
+			   unsigned HOST_WIDE_INT align)
+{
+  if (function_label_operand (x, VOIDmode))
+    {
+      tree decl = SYMBOL_REF_DECL (x);
+
+      if (DECL_P (decl) && DECL_COMDAT_GROUP (decl))
+	return get_named_section (NULL, ".data.rel.ro.local", 1);
+    }
+
+  return default_elf_select_rtx_section (mode, x, align);
+}
+
 /* Implement pa_reloc_rw_mask.  */
 
 static int

gcc/config/pa/pa32-linux.h

@@ -76,3 +76,8 @@ call_ ## FUNC (void)					\
    rodata when generating non-PIC code.  */
 #undef JUMP_TABLES_IN_TEXT_SECTION
 #define JUMP_TABLES_IN_TEXT_SECTION (flag_pic)
+
+/* We need to override default selection to put references to functions
+   in COMDAT groups in .data.rel.ro.local.  */
+#undef TARGET_ASM_SELECT_RTX_SECTION
+#define TARGET_ASM_SELECT_RTX_SECTION pa_elf_select_rtx_section