[PATCH v2 05/10] testsuite: Add check for unsupported TI ABI PRU features to testsuite

[Dimitar Dimitrov]

Not all C language features are supported when -mabi=ti option is
used for PRU target.

gcc/testsuite/ChangeLog:

2018-07-27  Dimitar Dimitrov  <dimi...@dinux.eu>

        * lib/gcc-dg.exp: Filter unsupported features in PRU's TI ABI mode.
        * lib/target-utils.exp: Ditto.
        * lib/target-supports.exp (check_effective_target_function_pointers,
        check_effective_target_large_return_values): New.

Signed-off-by: Dimitar Dimitrov <dimi...@dinux.eu>
---
 gcc/testsuite/lib/gcc-dg.exp          | 11 +++++++++++
 gcc/testsuite/lib/target-supports.exp | 26 ++++++++++++++++++++++++++
 gcc/testsuite/lib/target-utils.exp    |  8 ++++++++
 3 files changed, 45 insertions(+)

diff --git a/gcc/testsuite/lib/gcc-dg.exp b/gcc/testsuite/lib/gcc-dg.exp
index c26d1c73aa0..c061c152f16 100644
--- a/gcc/testsuite/lib/gcc-dg.exp
+++ b/gcc/testsuite/lib/gcc-dg.exp
@@ -405,6 +405,17 @@ proc gcc-dg-prune { system text } {
        return "::unsupported::memory full"
     }
 
+    if { [string match "*error: function pointers not supported*" $text]
+         && ![check_effective_target_function_pointers] } {
+       # The format here is important.  See dg.exp.
+       return "::unsupported::funcptr"
+    }
+    if { [string match "*error: large return values not supported*" $text]
+         && ![check_effective_target_large_return_values] } {
+       # The format here is important.  See dg.exp.
+       return "::unsupported::large return values"
+    }
+
     return $text
 }
 
diff --git a/gcc/testsuite/lib/target-supports.exp 
b/gcc/testsuite/lib/target-supports.exp
index 5299aaefcc3..711a6db1e97 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -2608,6 +2608,32 @@ proc check_effective_target_ptr32plus { } {
     }]
 }
 
+# Return 1 if target supports function pointers, 0 otherwise.
+
+proc check_effective_target_function_pointers { } {
+    if { [istarget pru-*-*] } {
+       return [check_no_compiler_messages func_ptr_avail assembly {
+           #ifdef __PRU_EABI_GNU__
+           #error unsupported
+           #endif
+       }]
+    }
+    return 1
+}
+
+# Return 1 if target supports arbitrarily large return values, 0 otherwise.
+
+proc check_effective_target_large_return_values { } {
+    if { [istarget pru-*-*] } {
+       return [check_no_compiler_messages func_ptr_avail assembly {
+           #ifdef __PRU_EABI_GNU__
+           #error unsupported
+           #endif
+       }]
+    }
+    return 1
+}
+
 # Return 1 if we support 32-bit or larger array and structure sizes
 # using default options, 0 otherwise.  Avoid false positive on
 # targets with 20 or 24 bit address spaces.
diff --git a/gcc/testsuite/lib/target-utils.exp 
b/gcc/testsuite/lib/target-utils.exp
index 732a1827a02..f636be2cb01 100644
--- a/gcc/testsuite/lib/target-utils.exp
+++ b/gcc/testsuite/lib/target-utils.exp
@@ -44,5 +44,13 @@ proc ${tool}_check_unsupported_p { output } {
             [string match "*exceeds local store*" $output] } {
        return "memory full"
     }
+    if { [string match "*error: function pointers not supported*" $output]
+         && ![check_effective_target_function_pointers] } {
+       return "function pointers not supported"
+    }
+    if { [string match "*error: large return values not supported*" $output]
+         && ![check_effective_target_large_return_values] } {
+       return "large return values not supported"
+    }
     return ""
 }
-- 
2.11.0