[xen staging] xen: gcov: add support for gcc 14

[patchbot@xxxxxxx]

commit 0d32dcb0731e59999b1b8578c5fcd17f0143a2a1
Author:     Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
AuthorDate: Mon Mar 31 09:22:11 2025 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Mar 31 09:22:11 2025 +0200

    xen: gcov: add support for gcc 14
    
    gcc 14 (with patch "Add condition coverage (MC/DC)") introduced 9th
    gcov counter. Also this version can call new merge function
    __gcov_merge_ior(), so we need a new stub for it.
    
    Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/common/coverage/gcc_4_7.c   | 4 +++-
 xen/common/coverage/gcov_base.c | 5 +++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/xen/common/coverage/gcc_4_7.c b/xen/common/coverage/gcc_4_7.c
index 1c20e35ee5..f4c1802303 100644
--- a/xen/common/coverage/gcc_4_7.c
+++ b/xen/common/coverage/gcc_4_7.c
@@ -28,8 +28,10 @@
 #define GCOV_COUNTERS 10
 #elif GCC_VERSION < 100000
 #define GCOV_COUNTERS 9
-#else
+#elif GCC_VERSION < 140000
 #define GCOV_COUNTERS 8
+#else
+#define GCOV_COUNTERS 9
 #endif
 
 #define GCOV_TAG_FUNCTION_LENGTH        3
diff --git a/xen/common/coverage/gcov_base.c b/xen/common/coverage/gcov_base.c
index d0c6d0a3f9..742034e039 100644
--- a/xen/common/coverage/gcov_base.c
+++ b/xen/common/coverage/gcov_base.c
@@ -56,6 +56,11 @@ void __gcov_merge_delta(gcov_type *counters, unsigned int 
n_counters)
     /* Unused. */
 }
 
+void __gcov_merge_ior(gcov_type *counters, unsigned int n_counters)
+{
+    /* Unused. */
+}
+
 /*
  * Local variables:
  * mode: C
--
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