[testsuite] PATCH: Add check_effective_target_pie

[H.J. Lu]

Hi,

This patch adds check_effective_target_pie to check if the current
multilib generatse PIE by default.  I will submit other patches to use
it.  OK for trunk?

Thanks.

H.J.
---
2015-01-11  H.J. Lu  <hongjiu...@intel.com>

        * gcc.target/i386/pie.c: New test.

        * lib/target-supports.exp (check_profiling_available): Return 0
        if PIE is enabled.
        (check_effective_target_pie): New.
---
 gcc/testsuite/gcc.target/i386/pie.c   | 12 ++++++++++++
 gcc/testsuite/lib/target-supports.exp | 15 +++++++++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 gcc/testsuite/gcc.target/i386/pie.c

diff --git a/gcc/testsuite/gcc.target/i386/pie.c 
b/gcc/testsuite/gcc.target/i386/pie.c
new file mode 100644
index 0000000..0a9f5ee
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pie.c
@@ -0,0 +1,12 @@
+/* { dg-do compile { target pie } } */
+/* { dg-options "-O2" } */
+
+int foo (void);
+
+int
+main (void)
+{
+  return foo ();
+}
+
+/* { dg-final { scan-assembler "foo@PLT" } } */
diff --git a/gcc/testsuite/lib/target-supports.exp 
b/gcc/testsuite/lib/target-supports.exp
index f5c6db8..549bcdf 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -475,6 +475,11 @@ proc check_profiling_available { test_what } {
        }
     }
 
+    # Profiling don't work with -fPIE -pie.
+    if { [check_effective_target_pie] } {
+      return 0
+    }
+
     # Support for -p on solaris2 relies on mcrt1.o which comes with the
     # vendor compiler.  We cannot reliably predict the directory where the
     # vendor compiler (and thus mcrt1.o) is installed so we can't
@@ -1080,6 +1085,16 @@ proc check_effective_target_nonpic { } {
     }]
 }
 
+# Return 1 if the current multilib generatse PIE by default.
+
+proc check_effective_target_pie { } {
+    return [check_no_compiler_messages pie assembly {
+       #ifndef __PIE__
+       #error unsupported
+       #endif
+    }]
+}
+
 # Return 1 if the target does not use a status wrapper.
 
 proc check_effective_target_unwrapped { } {
-- 
1.9.3