[PATCH 1/4] gdb.base/nodebug.exp: Add long double testing

gdb.base/nodebug.exp is missing testing calling long double functions.
This commit adds such tests.

With a GDB that doesn't know that "long double" is 64-bit on
x86_64-pc-windows-msvc, we get:

 FAIL: gdb.base/nodebug.exp: p (long double) mult_long_double(2.0L, 3.0L)
 FAIL: gdb.base/nodebug.exp: p ((long double (*) (long double, long double)) mult_long_double)(2.0L, 3.0L)
 FAIL: gdb.base/nodebug.exp: p ((long double (*) (long double, long double)) mult_long_double)(2, 3)
 FAIL: gdb.base/nodebug.exp: p ((long double (*) ()) mult_long_double_noproto)(2.0L, 3.0L)

Passes cleanly on:

 - x86_64-pc-linux-gnu
 - x86_64-w64-mingw32
 - x86_64-pc-windows-msvc, with the "long double" fix

Change-Id: If9ee749187e1d30fedcba17ae12634f3bd90de2f
---
 gdb/testsuite/gdb.base/nodebug.c   | 13 +++++++++++++
 gdb/testsuite/gdb.base/nodebug.exp |  6 ++++++
 2 files changed, 19 insertions(+)

diff --git a/gdb/testsuite/gdb.base/nodebug.c b/gdb/testsuite/gdb.base/nodebug.c
index c7bc93991b8..275a9d6ff60 100644
--- a/gdb/testsuite/gdb.base/nodebug.c
+++ b/gdb/testsuite/gdb.base/nodebug.c
@@ -72,6 +72,12 @@ mult (double v1, double v2)
   return v1 * v2;
 }
 
+long double
+mult_long_double (long double v1, long double v2)
+{
+  return v1 * v2;
+}
+
 double
 mult_noproto (v1, v2)
   double v1, v2;
@@ -79,6 +85,13 @@ mult_noproto (v1, v2)
   return v1 * v2;
 }
 
+long double
+mult_long_double_noproto (v1, v2)
+  long double v1, v2;
+{
+  return v1 * v2;
+}
+
 uint8_t
 add8 (uint8_t v1, uint8_t v2)
 {
diff --git a/gdb/testsuite/gdb.base/nodebug.exp b/gdb/testsuite/gdb.base/nodebug.exp
index e4138a801da..1a16e86ed2c 100644
--- a/gdb/testsuite/gdb.base/nodebug.exp
+++ b/gdb/testsuite/gdb.base/nodebug.exp
@@ -78,6 +78,12 @@ proc test_call_promotion {} {
     gdb_test "p ((double (*) ()) mult_noproto)(2.0f, 3.0f)" " = 6"
     gdb_test "p ((double (*) ()) mult_noproto)(2.0, 3.0)" " = 6"
 
+    # Same, but for long double.
+    gdb_test "p (long double) mult_long_double(2.0L, 3.0L)" " = 6"
+    gdb_test "p ((long double (*) (long double, long double)) mult_long_double)(2.0L, 3.0L)" " = 6"
+    gdb_test "p ((long double (*) (long double, long double)) mult_long_double)(2, 3)" " = 6"
+    gdb_test "p ((long double (*) ()) mult_long_double_noproto)(2.0L, 3.0L)" " = 6"
+
     # Check that GDB promotes char->int correctly.
     gdb_test "p /d (uint8) add8((uint8) 2, (uint8) 3)" " = 5"
     gdb_test "p /d ((uint8 (*) (uint8, uint8)) add8)((uint8) 2, (uint8) 3)" " = 5"
-- 
2.54.0