PR52665 do not let .ident confuse assembler scan tests

A branch with a name matching scan-assembler pattern triggers
inappropriate FAIL.

E.g. branch fixups-testsuite and
- gcc.target/i386/pr65871-?.c (scan-assembler-not "test")
- gcc.target/i386/pr41442.c (scan-assembler-times "test|cmp" 2)
etc.

This is a recurring problem as can be seen by some -fno-ident additions
by commits from e.g. Michael Meissner over the years: builtins-58.c,
powerpc/pr46728-?.c

The patch below adds -fno-ident if a testcase contains one of
scan-assembler, scan-assembler-not or scan-assembler-times.

Regression tested on x86_64-unknown-linux on a fixups-testsuite branch
where it fixes several false FAILs without regressions.

gcc/testsuite/ChangeLog

2016-06-18  Bernhard Reutner-Fischer  <aldot@gcc.gnu.org>

        PR testsuite/52665
        * lib/gcc-dg.exp (gcc-dg-test-1): Iterate over _required_options.
        * lib/target-supports.exp (scan-assembler_required_options,
        scan-assembler-not_required_options,
        scan-assembler-times_required_options): Add -fno-ident.
        * lib/scanasm.exp (scan-assembler-times): Fix error message.
        * c-c++-common/ident-0a.c: New test.
        * c-c++-common/ident-0b.c: New test.
        * c-c++-common/ident-1a.c: New test.
        * c-c++-common/ident-1b.c: New test.
        * c-c++-common/ident-2a.c: New test.
        * c-c++-common/ident-2b.c: New test.

From-SVN: r264128

gcc/testsuite/ChangeLog

@@ -1,3 +1,18 @@
+2018-09-05  Bernhard Reutner-Fischer  <aldot@gcc.gnu.org>
+
+	PR testsuite/52665
+	* lib/gcc-dg.exp (gcc-dg-test-1): Iterate over _required_options.
+	* lib/target-supports.exp (scan-assembler_required_options,
+	scan-assembler-not_required_options,
+	scan-assembler-times_required_options): Add -fno-ident.
+	* lib/scanasm.exp (scan-assembler-times): Fix error message.
+	* c-c++-common/ident-0a.c: New test.
+	* c-c++-common/ident-0b.c: New test.
+	* c-c++-common/ident-1a.c: New test.
+	* c-c++-common/ident-1b.c: New test.
+	* c-c++-common/ident-2a.c: New test.
+	* c-c++-common/ident-2b.c: New test.
+
 2018-09-05  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
 	* gcc.dg/recip_sqrt_mult_1.c: New test.

gcc/testsuite/c-c++-common/ident-0a.c

@@ -0,0 +1,6 @@
+/* PR testsuite/52665
+ * Make sure scan-assembler-not turns off .ident  */
+/* { dg-do compile } */
+int i;
+
+/* { dg-final { scan-assembler-not "GCC: " } } */

gcc/testsuite/c-c++-common/ident-0b.c

@@ -0,0 +1,10 @@
+/* PR testsuite/52665
+ * Make sure scan-assembler-not turns off .ident unless -fident in testcase */
+/* { dg-do compile } */
+/* { dg-options "-fident" } */
+int i;
+
+/* { dg-final { scan-assembler-not "GCC: " { xfail *-*-* } } } */
+/* The testsuite saw scan-assembler-not and turned off .ident so the above
+ * has to fail for proper operation since the testsuite itself forced
+ * -fident on again.  */

gcc/testsuite/c-c++-common/ident-1a.c

@@ -0,0 +1,8 @@
+/* PR testsuite/52665
+ * Make sure scan-assembler turns off .ident  */
+/* { dg-do compile } */
+int i;
+
+/* { dg-final { scan-assembler "GCC: " { xfail *-*-* } } } */
+/* The testsuite saw scan-assembler and turned off .ident so the above
+ * has to fail for proper operation.  */

gcc/testsuite/c-c++-common/ident-1b.c

@@ -0,0 +1,7 @@
+/* PR testsuite/52665
+ * Make sure scan-assembler turns off .ident unless -fident in testcase */
+/* { dg-do compile } */
+/* { dg-options "-fident" } */
+int i;
+
+/* { dg-final { scan-assembler "GCC: " } } */

gcc/testsuite/c-c++-common/ident-2a.c

@@ -0,0 +1,6 @@
+/* PR testsuite/52665
+ * Make sure scan-assembler-times turns off .ident  */
+/* { dg-do compile } */
+int i;
+
+/* { dg-final { scan-assembler-times "GCC: " 0 } } */ /* internal test, keep -times 0 ! */

gcc/testsuite/c-c++-common/ident-2b.c

@@ -0,0 +1,7 @@
+/* PR testsuite/52665
+ * Make sure scan-assembler-times turns off .ident unless -fident in testcase */
+/* { dg-do compile } */
+/* { dg-options "-fident" } */
+int ident;
+
+/* { dg-final { scan-assembler-times "GCC: " 1 } } */

gcc/testsuite/lib/gcc-dg.exp

@@ -299,9 +299,11 @@ proc gcc-dg-test-1 { target_compile prog do_what extra_tool_flags } {
     foreach x [split $finalcode "\n"] {
 	set finalcmd [lindex $x 0]
 	if { [info procs ${finalcmd}_required_options] != "" } {
-	    set req [${finalcmd}_required_options]
-	    if { $req != "" && [lsearch -exact $extra_tool_flags $req] == -1 } {
-		lappend extra_tool_flags $req
+	    foreach req [${finalcmd}_required_options] {
+		if { $req != ""
+		     && [lsearch -exact $extra_tool_flags $req] == -1 } {
+		    lappend extra_tool_flags $req
+		}
 	    }
 	}
     }

gcc/testsuite/lib/target-supports.exp

@@ -8895,6 +8895,12 @@ proc force_conventional_output_for { test } {
     }
     proc ${test}_required_options {} {
 	global gcc_force_conventional_output
+	upvar 1 extra_tool_flags extra_tool_flags
+	if {[regexp -- "^scan-assembler" [info level 0]]
+	    && ![string match "*-fident*" $extra_tool_flags]} {
+	    # Do not let .ident confuse assembler scan tests
+	    return [list $gcc_force_conventional_output "-fno-ident"]
+	}
 	return $gcc_force_conventional_output
     }
 }