[testsuite] introduce strndup effective target

A number of tests that call strndup fail on vxworks, where there's no
strndup.  Some of them already had workarounds to skip the strndup
parts of the tests on platforms that don't offer it.  I've changed
them to rely on a strndup effective target instead, and extended the
logic to other tests that were otherwise skipped entirely.


for  gcc/ChangeLog

	* doc/sourcebuild.texi (strndup): Add effective target.

for  gcc/testsuite/ChangeLog

	* lib/target-supports.exp (check_effective_target_strndup): New.
	* gcc.dg/builtin-dynamic-object-size-0.c: Skip strndup tests
	when the function is not available.
	* gcc.dg/builtin-dynamic-object-size-1.c: Likewise.
	* gcc.dg/builtin-dynamic-object-size-2.c: Likewise.
	* gcc.dg/builtin-dynamic-object-size-3.c: Likewise.
	* gcc.dg/builtin-dynamic-object-size-4.c: Likewise.
	* gcc.dg/builtin-object-size-1.c: Likewise.
	* gcc.dg/builtin-object-size-2.c: Likewise.
	* gcc.dg/builtin-object-size-3.c: Likewise.
	* gcc.dg/builtin-object-size-4.c: Likewise.

11 files changed, 43 insertions, 17 deletions

diff --git a/gcc/doc/sourcebuild.texi b/gcc/doc/sourcebuild.texi
index 7c0df90..8e4e59a 100644
--- a/gcc/doc/sourcebuild.texi
+++ b/gcc/doc/sourcebuild.texi
@@ -2837,6 +2837,9 @@ can be included without error when @option{-mbig-endian} is passed.
 @item stpcpy
 Target provides @code{stpcpy} function.
 
+@item strndup
+Target provides @code{strndup} function.
+
 @item sysconf
 Target supports @code{sysconf}.
 
diff --git a/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-0.c b/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-0.c
index 173e7c7..d02e37f 100644
--- a/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-0.c
+++ b/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-0.c
@@ -1,7 +1,7 @@
 /* { dg-do run } */
 /* { dg-options "-O2" } */
 /* { dg-require-effective-target size20plus } */
-/* { dg-skip-if "no strndup" { hppa*-*-hpux* } } */
+/* { dg-additional-options "-DSKIP_STRNDUP" { target { ! strndup } } } */
 
 #include "builtin-object-size-common.h"
 
@@ -567,6 +567,7 @@ test_strdup (const char *in)
   return sz;
 }
 
+#ifndef SKIP_STRNDUP
 size_t
 __attribute__ ((noinline))
 test_strndup (const char *in, size_t bound)
@@ -577,6 +578,7 @@ test_strndup (const char *in, size_t bound)
   __builtin_free (res);
   return sz;
 }
+#endif
 
 size_t
 __attribute__ ((noinline))
@@ -589,6 +591,7 @@ test_strdup_min (const char *in)
   return sz;
 }
 
+#ifndef SKIP_STRNDUP
 size_t
 __attribute__ ((noinline))
 test_strndup_min (const char *in, size_t bound)
@@ -599,6 +602,7 @@ test_strndup_min (const char *in, size_t bound)
   __builtin_free (res);
   return sz;
 }
+#endif
 
 /* Other tests.  */
 
@@ -788,12 +792,16 @@ main (int argc, char **argv)
   const char *str = "hello world";
   if (test_strdup (str) != __builtin_strlen (str) + 1)
     FAIL ();
+#ifndef SKIP_STRNDUP
   if (test_strndup (str, 4) != 5)
     FAIL ();
+#endif
   if (test_strdup_min (str) != __builtin_strlen (str) + 1)
     FAIL ();
+#ifndef SKIP_STRNDUP
   if (test_strndup_min (str, 4) != 1)
     FAIL ();
+#endif
 
   DONE ();
 }
diff --git a/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-1.c b/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-1.c
index ffa5998..76b4f70 100644
--- a/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-1.c
+++ b/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-1.c
@@ -1,7 +1,7 @@
 /* { dg-do run } */
 /* { dg-options "-O2 -Wno-stringop-overread" } */
 /* { dg-require-effective-target alloca } */
-/* { dg-skip-if "no strndup" { hppa*-*-hpux* } } */
+/* { dg-additional-options "-DSKIP_STRNDUP" { target { ! strndup } } } */
 
 #define __builtin_object_size __builtin_dynamic_object_size
 #include "builtin-object-size-1.c"
diff --git a/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-2.c b/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-2.c
index fff32da..cb757a8 100644
--- a/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-2.c
+++ b/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-2.c
@@ -1,7 +1,7 @@
 /* { dg-do run } */
 /* { dg-options "-O2 -Wno-stringop-overread" } */
 /* { dg-require-effective-target alloca } */
-/* { dg-skip-if "no strndup" { hppa*-*-hpux* } } */
+/* { dg-additional-options "-DSKIP_STRNDUP" { target { ! strndup } } } */
 
 #define __builtin_object_size __builtin_dynamic_object_size
 #include "builtin-object-size-2.c"
diff --git a/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-3.c b/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-3.c
index ac223d6..8a12f02 100644
--- a/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-3.c
+++ b/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-3.c
@@ -1,7 +1,7 @@
 /* { dg-do run } */
 /* { dg-options "-O2 -Wno-stringop-overread" } */
 /* { dg-require-effective-target alloca } */
-/* { dg-skip-if "no strndup" { hppa*-*-hpux* } } */
+/* { dg-additional-options "-DSKIP_STRNDUP" { target { ! strndup } } } */
 
 #define __builtin_object_size __builtin_dynamic_object_size
 #include "builtin-object-size-3.c"
diff --git a/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-4.c b/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-4.c
index fdf4284..0efc2d9 100644
--- a/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-4.c
+++ b/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-4.c
@@ -1,7 +1,7 @@
 /* { dg-do run } */
 /* { dg-options "-O2 -Wno-stringop-overread" } */
 /* { dg-require-effective-target alloca } */
-/* { dg-skip-if "no strndup" { hppa*-*-hpux* } } */
+/* { dg-additional-options "-DSKIP_STRNDUP" { target { ! strndup } } } */
 
 #define __builtin_object_size __builtin_dynamic_object_size
 #include "builtin-object-size-4.c"
diff --git a/gcc/testsuite/gcc.dg/builtin-object-size-1.c b/gcc/testsuite/gcc.dg/builtin-object-size-1.c
index 4f7d4c0..d6d13c5 100644
--- a/gcc/testsuite/gcc.dg/builtin-object-size-1.c
+++ b/gcc/testsuite/gcc.dg/builtin-object-size-1.c
@@ -1,6 +1,7 @@
 /* { dg-do run } */
 /* { dg-options "-O2 -Wno-stringop-overread" } */
 /* { dg-require-effective-target alloca } */
+/* { dg-additional-options "-DSKIP_STRNDUP" { target { ! strndup } } } */
 
 #include "builtin-object-size-common.h"
 
@@ -621,7 +622,7 @@ test10 (void)
     }
 }
 
-#if !defined(__AVR__) && !defined(__hpux__) /* avr and hpux have no strndup */
+#ifndef SKIP_STRNDUP
 /* Tests for strdup/strndup.  */
 size_t
 __attribute__ ((noinline))
@@ -709,7 +710,7 @@ test11 (void)
     FAIL ();
   free (res);
 }
-#endif /* avr */
+#endif
 
 int
 main (void)
@@ -726,7 +727,7 @@ main (void)
   test8 ();
   test9 (1);
   test10 ();
-#if !defined(__AVR__) && !defined(__hpux__) /* avr and hpux have no strndup */
+#ifndef SKIP_STRNDUP
   test11 ();
 #endif
   DONE ();
diff --git a/gcc/testsuite/gcc.dg/builtin-object-size-2.c b/gcc/testsuite/gcc.dg/builtin-object-size-2.c
index 37d3dcc..c28d72e 100644
--- a/gcc/testsuite/gcc.dg/builtin-object-size-2.c
+++ b/gcc/testsuite/gcc.dg/builtin-object-size-2.c
@@ -1,6 +1,7 @@
 /* { dg-do run } */
 /* { dg-options "-O2 -Wno-stringop-overread" } */
 /* { dg-require-effective-target alloca } */
+/* { dg-additional-options "-DSKIP_STRNDUP" { target { ! strndup } } } */
 
 #include "builtin-object-size-common.h"
 
@@ -536,7 +537,7 @@ test8 (unsigned cond)
 #endif
 }
 
-#if !defined(__AVR__) && !defined(__hpux__) /* avr and hpux have no strndup */
+#ifndef SKIP_STRNDUP
 /* Tests for strdup/strndup.  */
 size_t
 __attribute__ ((noinline))
@@ -624,7 +625,7 @@ test9 (void)
     FAIL ();
   free (res);
 }
-#endif /* avr */
+#endif
 
 int
 main (void)
@@ -639,7 +640,7 @@ main (void)
   test6 ();
   test7 ();
   test8 (1);
-#if !defined(__AVR__) && !defined(__hpux__) /* avr and hpux have no strndup */
+#ifndef SKIP_STRNDUP
   test9 ();
 #endif
   DONE ();
diff --git a/gcc/testsuite/gcc.dg/builtin-object-size-3.c b/gcc/testsuite/gcc.dg/builtin-object-size-3.c
index f4d1ebf..3f58da3 100644
--- a/gcc/testsuite/gcc.dg/builtin-object-size-3.c
+++ b/gcc/testsuite/gcc.dg/builtin-object-size-3.c
@@ -1,6 +1,7 @@
 /* { dg-do run } */
 /* { dg-options "-O2 -Wno-stringop-overread" } */
 /* { dg-require-effective-target alloca } */
+/* { dg-additional-options "-DSKIP_STRNDUP" { target { ! strndup } } } */
 
 #include "builtin-object-size-common.h"
 
@@ -628,7 +629,7 @@ test10 (void)
     }
 }
 
-#if !defined(__AVR__) && !defined(__hpux__) /* avr and hpux have no strndup */
+#ifndef SKIP_STRNDUP
 /* Tests for strdup/strndup.  */
 size_t
 __attribute__ ((noinline))
@@ -717,7 +718,7 @@ test11 (void)
     FAIL ();
   free (res);
 }
-#endif /* avr */
+#endif
 
 int
 main (void)
@@ -734,7 +735,7 @@ main (void)
   test8 ();
   test9 (1);
   test10 ();
-#if !defined(__AVR__) && !defined(__hpux__) /* avr and hpux have no strndup */
+#ifndef SKIP_STRNDUP
   test11 ();
 #endif
   DONE ();
diff --git a/gcc/testsuite/gcc.dg/builtin-object-size-4.c b/gcc/testsuite/gcc.dg/builtin-object-size-4.c
index 2887dd1..b3eb36e 100644
--- a/gcc/testsuite/gcc.dg/builtin-object-size-4.c
+++ b/gcc/testsuite/gcc.dg/builtin-object-size-4.c
@@ -1,6 +1,7 @@
 /* { dg-do run } */
 /* { dg-options "-O2 -Wno-stringop-overread" } */
 /* { dg-require-effective-target alloca } */
+/* { dg-additional-options "-DSKIP_STRNDUP" { target { ! strndup } } } */
 
 #include "builtin-object-size-common.h"
 
@@ -509,7 +510,7 @@ test8 (unsigned cond)
 #endif
 }
 
-#if !defined(__AVR__) && !defined(__hpux__) /* avr and hpux have no strndup */
+#ifndef SKIP_STRNDUP
 /* Tests for strdup/strndup.  */
 size_t
 __attribute__ ((noinline))
@@ -597,7 +598,7 @@ test9 (void)
     FAIL ();
   free (res);
 }
-#endif /* avr */
+#endif
 
 int
 main (void)
@@ -612,7 +613,7 @@ main (void)
   test6 ();
   test7 ();
   test8 (1);
-#if !defined(__AVR__) && !defined(__hpux__) /* avr and hpux have no strndup */
+#ifndef SKIP_STRNDUP
   test9 ();
 #endif
   DONE ();
diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index 938fff9..3a5713d 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -11581,6 +11581,17 @@ proc check_effective_target_stpcpy {} {
     return [check_function_available "stpcpy"]
 }
 
+# Returns 1 if "strndup" is available on the target system.
+
+proc check_effective_target_strndup {} {
+    if { [istarget *-*-vxworks*] } {
+	# VxWorks doesn't have strndup but our way to test fails
+	# to detect as we're doing partial links for kernel modules.
+	return 0
+    }
+    return [check_function_available "strndup"]
+}
+
 # Returns 1 if "sigsetjmp" is available on the target system.
 # Also check if "__sigsetjmp" is defined since that's what glibc
 # uses.