[PATCH 1/5] s390: Use proper read-only data section for literals.

[Marcin Kościelnicki]

Previously, .rodata was hardcoded.  For C++ vague linkage functions,
this resulted in needlessly duplicated literals.  With the new split
stack support, this resulted in link errors, due to .rodata containing
relocations to the discarded text sections.

gcc/ChangeLog:

	* config/s390/s390.md (pool_section_start): Use switch_to_section
	to select proper read-only data section instead of hardcoding .rodata.
	(pool_section_end): Use switch_to_section to match the above.
---
 gcc/ChangeLog           |  6 ++++++
 gcc/config/s390/s390.md | 11 +++++++++--
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 23ce209..2c572a7 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2016-01-02  Marcin Kościelnicki  <koriakin@0x04.net>
+
+	* config/s390/s390.md (pool_section_start): Use switch_to_section
+	to select proper read-only data section instead of hardcoding .rodata.
+	(pool_section_end): Use switch_to_section to match the above.
+
 2016-01-01  Sandra Loosemore  <sandra@codesourcery.com>
 
 	PR 1078
diff --git a/gcc/config/s390/s390.md b/gcc/config/s390/s390.md
index a1fc96a..0ebefd6 100644
--- a/gcc/config/s390/s390.md
+++ b/gcc/config/s390/s390.md
@@ -10247,13 +10247,20 @@
 (define_insn "pool_section_start"
   [(unspec_volatile [(const_int 1)] UNSPECV_POOL_SECTION)]
   ""
-  ".section\t.rodata"
+{
+  switch_to_section (targetm.asm_out.function_rodata_section
+		 (current_function_decl));
+  return "";
+}
   [(set_attr "length" "0")])
 
 (define_insn "pool_section_end"
   [(unspec_volatile [(const_int 0)] UNSPECV_POOL_SECTION)]
   ""
-  ".previous"
+{
+  switch_to_section (current_function_section ());
+  return "";
+}
   [(set_attr "length" "0")])
 
 (define_insn "main_base_31_small"
-- 
2.6.4