[RFA 2/5] Use scoped_switch_auto_to_sym_language in symtab.c to switch language.

[Philippe Waroquiers <philippe.waroquiers@skynet.be>]

Use scoped_switch_auto_to_sym_language in treg_matches_sym_type_name to
replace the local logic that was doing the same as the new class
scoped_switch_auto_to_sym_language.

Use scoped_switch_auto_to_sym_language inside print_symbol_info, so
that symbol information is printed in the symbol language when
language mode is auto.
This modifies the behaviour of the test dw2-case-insensitive.exp,
as the function FUNC_lang is now printed with the Fortran syntax
(as declared in the .S file).

gdb/ChangeLog
2018-10-27  Philippe Waroquiers  <philippe.waroquiers@skynet.be>

	* symtab.c (treg_matches_sym_type_name): Use
	scoped_switch_auto_to_sym_language instead of local logic.
	(print_symbol_info): Use scoped_switch_auto_to_sym_language
	to switch to SYM language when language mode is auto.

gdb/testsuite/ChangeLOg
2018-10-27  Philippe Waroquiers  <philippe.waroquiers@skynet.be>

	* gdb.dwarf2/dw2-case-insensitive.exp: Update due to auto switch to
	FUNC_lang language syntax.
---
 gdb/symtab.c                                      | 12 +++++-------
 gdb/testsuite/gdb.dwarf2/dw2-case-insensitive.exp |  4 +++-
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/gdb/symtab.c b/gdb/symtab.c
index cd27a75e8c..0f9d562c84 100644
--- a/gdb/symtab.c
+++ b/gdb/symtab.c
@@ -4288,15 +4288,12 @@ treg_matches_sym_type_name (const compiled_regex &treg,
   if (sym_type == NULL)
     return false;
 
-  if (language_mode == language_mode_auto)
-    {
-      scoped_restore_current_language l;
+  {
+    scoped_switch_auto_to_sym_language l (sym);
 
-      set_language (SYMBOL_LANGUAGE (sym));
-      printed_sym_type_name = type_to_string (sym_type);
-    }
-  else
     printed_sym_type_name = type_to_string (sym_type);
+  }
+
 
   if (symbol_lookup_debug > 1)
     {
@@ -4601,6 +4598,7 @@ print_symbol_info (enum search_domain kind,
 		   struct symbol *sym,
 		   int block, const char *last)
 {
+  scoped_switch_auto_to_sym_language l (sym);
   struct symtab *s = symbol_symtab (sym);
 
   if (last != NULL)
diff --git a/gdb/testsuite/gdb.dwarf2/dw2-case-insensitive.exp b/gdb/testsuite/gdb.dwarf2/dw2-case-insensitive.exp
index b15dcafa00..2e3397865a 100644
--- a/gdb/testsuite/gdb.dwarf2/dw2-case-insensitive.exp
+++ b/gdb/testsuite/gdb.dwarf2/dw2-case-insensitive.exp
@@ -42,8 +42,10 @@ gdb_test "info functions fUnC_lang" \
 gdb_test "set case-sensitive off" {warning: the current case sensitivity setting does not match the language\.}
 
 # The dot-leading symbol is for ppc64 function descriptors.
+# Note that info functions gives the FUNC_lang result using the fortran syntax
+# as specific in dw-case-insensitive-debug.S DW_AT_language.
 gdb_test "info functions fUnC_lang" \
-	 "All functions matching regular expression \"fUnC_lang\":\[\r\n\]+File file1.txt:\r\n\tfoo FUNC_lang\\(void\\);(\r\n\r\nNon-debugging symbols:\r\n0x\[0-9a-f\]+ +\\.FUNC_lang)?" \
+	 "All functions matching regular expression \"fUnC_lang\":\[\r\n\]+File file1.txt:\r\n\tfoo FUNC_lang\\(\\);(\r\n\r\nNon-debugging symbols:\r\n0x\[0-9a-f\]+ +\\.FUNC_lang)?" \
 	 "regexp case-sensitive off"
 
 gdb_test "p fuNC_lang" { = {foo \(void\)} 0x[0-9a-f]+ <FUNC_lang>}
-- 
2.19.1