[PATCH 1/3] gprofng: Define ATTRIBUTE_FALLTHROUGH

[H.J. Lu]

Define ATTRIBUTE_FALLTHROUGH to __attribute__ ((fallthrough)) only for
GCC 7 or above.

	PR gprof/28969
	* common/gp-defs.h (ATTRIBUTE_FALLTHROUGH): New.
	* src/gp-collect-app.cc (collect::check_args): Replace
	__attribute__ ((fallthrough)) with ATTRIBUTE_FALLTHROUGH.
---
 gprofng/common/gp-defs.h      | 8 ++++++++
 gprofng/src/gp-collect-app.cc | 2 +-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/gprofng/common/gp-defs.h b/gprofng/common/gp-defs.h
index 440bfb1c5e2..e92c33e101b 100644
--- a/gprofng/common/gp-defs.h
+++ b/gprofng/common/gp-defs.h
@@ -55,4 +55,12 @@
 #define WSIZE_32            1
 #endif
 
+#ifndef ATTRIBUTE_FALLTHROUGH
+# if (GCC_VERSION >= 7000)
+#  define ATTRIBUTE_FALLTHROUGH __attribute__ ((__fallthrough__))
+# else
+#  define ATTRIBUTE_FALLTHROUGH	/* Fall through */
+# endif
+#endif
+
 #endif
diff --git a/gprofng/src/gp-collect-app.cc b/gprofng/src/gp-collect-app.cc
index afaae70bc2b..34874b8c296 100644
--- a/gprofng/src/gp-collect-app.cc
+++ b/gprofng/src/gp-collect-app.cc
@@ -848,7 +848,7 @@ collect::check_args (int argc, char *argv[])
 	  }
 	case 'O':
 	  overwriteExp = true;
-	  __attribute__ ((fallthrough));
+	  ATTRIBUTE_FALLTHROUGH
 	case 'o':
 	  if (precheck == 1)
 	    {
-- 
2.35.1