testsuite: Disable BTF and CTF testsuite on AIX.

	CTF utilizes DWARF sections, but it is a distinct debugging
	format.  The CTF support in GCC is not implemented as a
	separate debugging format.  AIX supports DWARF but not CTF
	section.

	The GCC testsuite test for target support of a debugging format
	checks if GCC itself emits an error message, not if the
	debugging output compiles correctly.  Because CTF is not
	a distinct debugging format, GCC does not distinguish support
	for targets and does not have the ability to produce an error
	message.

	This patch skips the CTF and BTF debug directories, and
	explicitly reports that AIX doesn't support CTF.  Currently the
        dejagnu code to skip multiple debugging levels for CTF does
        not ensure that CTF is a supported debugging format. The patch
	also shifts the CTF options logic to within the test that CTF
	debug format is supported.

Bootstrapped on powerpc-ibm-aix7.2.3.0 and powerpc64le-linux.

gcc/testsuite/ChangeLog:

	* gcc.dg/debug/btf/btf.exp: Skip on AIX.
	* gcc.dg/debug/ctf/ctf.exp: Skip on AIX.
	* lib/gcc-dg.exp (gcc-dg-target-supports-debug-format): AIX
	doesn't support CTF.
	(gcc-dg-debug-runtest): Move CTF support within
	target support format test.

3 files changed, 33 insertions, 22 deletions

diff --git a/gcc/testsuite/gcc.dg/debug/btf/btf.exp b/gcc/testsuite/gcc.dg/debug/btf/btf.exp
index e72a2be..e173515 100644
--- a/gcc/testsuite/gcc.dg/debug/btf/btf.exp
+++ b/gcc/testsuite/gcc.dg/debug/btf/btf.exp
@@ -24,6 +24,11 @@ if { [istarget nvptx-*-*] } {
     return
 }
 
+if { [istarget "powerpc-ibm-aix*"] } {
+    set torture_execute_xfail "powerpc-ibm-aix*"
+    return
+}
+
 # If a testcase doesn't have special options, use these.
 global DEFAULT_CFLAGS
 if ![info exists DEFAULT_CFLAGS] then {
diff --git a/gcc/testsuite/gcc.dg/debug/ctf/ctf.exp b/gcc/testsuite/gcc.dg/debug/ctf/ctf.exp
index 46055f8..0b650ed 100644
--- a/gcc/testsuite/gcc.dg/debug/ctf/ctf.exp
+++ b/gcc/testsuite/gcc.dg/debug/ctf/ctf.exp
@@ -24,6 +24,11 @@ if { [istarget nvptx-*-*] } {
     return
 }
 
+if { [istarget "powerpc-ibm-aix*"] } {
+    set torture_execute_xfail "powerpc-ibm-aix*"
+    return
+}
+
 # If a testcase doesn't have special options, use these.
 global DEFAULT_CFLAGS
 if ![info exists DEFAULT_CFLAGS] then {
diff --git a/gcc/testsuite/lib/gcc-dg.exp b/gcc/testsuite/lib/gcc-dg.exp
index 51d8a11..81f4bb2 100644
--- a/gcc/testsuite/lib/gcc-dg.exp
+++ b/gcc/testsuite/lib/gcc-dg.exp
@@ -641,6 +641,7 @@ proc gcc-dg-frontend-supports-ctf { target_compile trivial } {
 proc gcc-dg-target-supports-debug-format { target_compile trivial type } {
     global srcdir subdir
 
+    if {$type == "-gctf" && [istarget *-*-aix*]} { return 0 }
     set comp_output [$target_compile \
 	    "$srcdir/$subdir/$trivial" "trivial.S" assembly \
 	    "additional_flags=$type"]
@@ -656,29 +657,29 @@ proc gcc-dg-debug-runtest { target_compile trivial opt_opts testcases } {
     if ![info exists DEBUG_TORTURE_OPTIONS] {
 	set DEBUG_TORTURE_OPTIONS ""
 	foreach type {-gctf -gdwarf-2 -gstabs -gstabs+ -gxcoff -gxcoff+} {
-	    if { $type == "-gctf" } {
-		if [expr [gcc-dg-frontend-supports-ctf \
-			  $target_compile $trivial]] {
-		    # At this time, running tests with various opt levels or
-		    # ctf debug info levels does not add value.
-		    lappend DEBUG_TORTURE_OPTIONS  [list "${type}"]
+	    if [expr [gcc-dg-target-supports-debug-format \
+		      $target_compile $trivial $type]] {
+		if { $type == "-gctf" } {
+		    if [expr [gcc-dg-frontend-supports-ctf \
+			      $target_compile $trivial]] {
+			# At this time, running tests with various opt levels or
+			# ctf debug info levels does not add value.
+			lappend DEBUG_TORTURE_OPTIONS  [list "${type}"]
+		    }
+		    continue
 		}
-	    } else {
-		if [expr [gcc-dg-target-supports-debug-format \
-			  $target_compile $trivial $type]] {
-		    foreach level {1 "" 3} {
-			if { ($type == "-gdwarf-2") && ($level != "") } {
-			    lappend DEBUG_TORTURE_OPTIONS [list "${type}" "-g${level}"]
-			    foreach opt $opt_opts {
-				lappend DEBUG_TORTURE_OPTIONS \
-					[list "${type}" "-g${level}" "$opt" ]
-			    }
-			} else {
-			    lappend DEBUG_TORTURE_OPTIONS [list "${type}${level}"]
-			    foreach opt $opt_opts {
-				lappend DEBUG_TORTURE_OPTIONS \
-					[list "${type}${level}" "$opt" ]
-			    }
+		foreach level {1 "" 3} {
+		    if { ($type == "-gdwarf-2") && ($level != "") } {
+			lappend DEBUG_TORTURE_OPTIONS [list "${type}" "-g${level}"]
+			foreach opt $opt_opts {
+			    lappend DEBUG_TORTURE_OPTIONS \
+				    [list "${type}" "-g${level}" "$opt" ]
+			}
+		    } else {
+			lappend DEBUG_TORTURE_OPTIONS [list "${type}${level}"]
+			foreach opt $opt_opts {
+			    lappend DEBUG_TORTURE_OPTIONS \
+				    [list "${type}${level}" "$opt" ]
 			}
 		    }
 		}