gdb/fortran: Print 'void' type in lower case

For a program compiled with gfortran the base type names are written
as lower cases in the DWARF, and so GDB will display them as lower
case.  Additionally, in most places where GDB supplies its own type
names (for example all of the types defined in f-lang.c in
`build_fortran_types`), the type names are all lower case.

An exception to this is where GDB prints the void type for Fortran.
In this case GDB uses upper case.

I'm not aware of any reason why this type should merit special
attention, and it looks our of place when printing types, so this
commit changes from 'VOID' to 'void' to match all the other types.

gdb/ChangeLog:

	* f-lang.c (build_fortran_types): Change name of void type to
	lower case.
	* f-typeprint.c (f_type_print_base): Print the name of the void
	type, rather than a fixed string.
	* f-valprint.c (f_decorations): Use lower case void string.

gdb/testsuite/ChangeLog:

	* gdb.fortran/exprs.exp (test_convenience_variables): Expect lower
	case void string.

6 files changed, 21 insertions, 4 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 2ccda00..f0e1520 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,4 +1,12 @@
 2019-04-30  Andrew Burgess  <andrew.burgess@embecosm.com>
+
+	* f-lang.c (build_fortran_types): Change name of void type to
+	lower case.
+	* f-typeprint.c (f_type_print_base): Print the name of the void
+	type, rather than a fixed string.
+	* f-valprint.c (f_decorations): Use lower case void string.
+
+2019-04-30  Andrew Burgess  <andrew.burgess@embecosm.com>
 	    Chris January  <chris.january@arm.com>
 
 	* dwarf2read.c (dwarf2_init_complex_target_type): Use different
diff --git a/gdb/f-lang.c b/gdb/f-lang.c
index cc4e154..9da6fdb 100644
--- a/gdb/f-lang.c
+++ b/gdb/f-lang.c
@@ -689,7 +689,7 @@ build_fortran_types (struct gdbarch *gdbarch)
     = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_f_type);
 
   builtin_f_type->builtin_void
-    = arch_type (gdbarch, TYPE_CODE_VOID, TARGET_CHAR_BIT, "VOID");
+    = arch_type (gdbarch, TYPE_CODE_VOID, TARGET_CHAR_BIT, "void");
 
   builtin_f_type->builtin_character
     = arch_type (gdbarch, TYPE_CODE_CHAR, TARGET_CHAR_BIT, "character");
diff --git a/gdb/f-typeprint.c b/gdb/f-typeprint.c
index a0e34b3..26ea901 100644
--- a/gdb/f-typeprint.c
+++ b/gdb/f-typeprint.c
@@ -328,7 +328,11 @@ f_type_print_base (struct type *type, struct ui_file *stream, int show,
       break;
 
     case TYPE_CODE_VOID:
-      fprintfi_filtered (level, stream, "VOID");
+      {
+	gdbarch *gdbarch = get_type_arch (type);
+	struct type *void_type = builtin_f_type (gdbarch)->builtin_void;
+	fprintfi_filtered (level, stream, "%s", TYPE_NAME (void_type));
+      }
       break;
 
     case TYPE_CODE_UNDEF:
diff --git a/gdb/f-valprint.c b/gdb/f-valprint.c
index 37b0ed5..264416e 100644
--- a/gdb/f-valprint.c
+++ b/gdb/f-valprint.c
@@ -199,7 +199,7 @@ static const struct generic_val_print_decorations f_decorations =
   ")",
   ".TRUE.",
   ".FALSE.",
-  "VOID",
+  "void",
   "{",
   "}"
 };
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 5bbf151..23047c1 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,5 +1,10 @@
 2019-04-30  Andrew Burgess  <andrew.burgess@embecosm.com>
 
+	* gdb.fortran/exprs.exp (test_convenience_variables): Expect lower
+	case void string.
+
+2019-04-30  Andrew Burgess  <andrew.burgess@embecosm.com>
+
 	* gdb.fortran/complex.exp: Expand.
 	* gdb.fortran/complex.f: Renamed to...
 	* gdb.fortran/complex.f90: ...this, and extended to add more
diff --git a/gdb/testsuite/gdb.fortran/exprs.exp b/gdb/testsuite/gdb.fortran/exprs.exp
index 3b24f7c..8649d0b 100644
--- a/gdb/testsuite/gdb.fortran/exprs.exp
+++ b/gdb/testsuite/gdb.fortran/exprs.exp
@@ -141,7 +141,7 @@ proc test_convenience_variables {} {
     gdb_test "print (\$foo = 32) + 4"	" = 36" \
 	"Use convenience variable assignment in arithmetic expression"
 
-    gdb_test "print \$bar"		" = VOID" \
+    gdb_test "print \$bar"		" = void" \
 	"Print contents of uninitialized convenience variable"
 }