[binutils-gdb] gprofng: Define ATTRIBUTE_FALLTHROUGH

[H.J. Lu]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=c5edd3b8847f118bd022c473b126695fb39f6412

commit c5edd3b8847f118bd022c473b126695fb39f6412
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue Mar 15 08:49:01 2022 -0700

    gprofng: Define ATTRIBUTE_FALLTHROUGH
    
    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
            /* FALLTHROUGH */ with ATTRIBUTE_FALLTHROUGH.

Diff:
---
 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 a40cf8fb9be..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;
-          /* FALLTHROUGH */
+	  ATTRIBUTE_FALLTHROUGH
 	case 'o':
 	  if (precheck == 1)
 	    {