[google]Make test callgraph-profiles.C run only when section attribute e is supported (issue5167045)

[tmsriram at google dot com (Sriraman Tallam)]

Disable running of callgraph-profiles.C is section attribute "e" is not supported.

Index: lib/target-supports-dg.exp
===================================================================
--- lib/target-supports-dg.exp	(revision 179400)
+++ lib/target-supports-dg.exp	(working copy)
@@ -100,6 +100,16 @@
     }
 }
 
+# If this target does not support the section exclude "e" attribute,
+# skip this test.
+
+proc dg-require-section-exclude { args } {
+    if { ![ check_section_exclude_available ] } {
+	upvar dg-do-what dg-do-what
+	set dg-do-what [list [lindex ${dg-do-what} 0] "N" "P"]
+    }
+}
+
 # If this target's linker does not support the --gc-sections flag,
 # skip this test.
 
Index: lib/target-supports.exp
===================================================================
--- lib/target-supports.exp	(revision 179400)
+++ lib/target-supports.exp	(working copy)
@@ -382,6 +382,18 @@
     }]
 }
 
+# Returns true if tool chain supports "e" section attribute.
+
+proc check_section_exclude_available { } {
+    return [check_runtime_nocache section_exclude_available {
+		asm(".section \".gnu.callgraph.text.main\", \"e\"");
+		int main()
+		{
+		  return 0;
+		}
+  }]
+}
+
 # Returns true if --gc-sections is supported on the target.
 
 proc check_gc_sections_available { } {
Index: g++.dg/tree-prof/callgraph-profiles.C
===================================================================
--- g++.dg/tree-prof/callgraph-profiles.C	(revision 179400)
+++ g++.dg/tree-prof/callgraph-profiles.C	(working copy)
@@ -1,6 +1,7 @@
 /* Verify if call-graph profile sections are created
    with -fcallgraph-profiles-sections. */
 /* { dg-options "-O2 -fcallgraph-profiles-sections -ffunction-sections --save-temps" } */
+/* { dg-require-section-exclude "" } */
 
 int __attribute__ ((noinline))
 foo ()

--
This patch is available for review at http://codereview.appspot.com/5167045