[Xen-devel] [PATCH] gcov: support gcc 7.x

["Jan Beulich" <JBeulich@xxxxxxxx>]

Taking Linux commit 0538421343 ("gcov: support GCC 7.1") as reference,
enable gcc 7 support requiring __gcov_exit() and having 9 counters.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
Considering that gcc 7 has been out for a while, I think we shouldn't
ship 4.10 with not even building gcov when using that compiler.

--- a/xen/Kconfig.debug
+++ b/xen/Kconfig.debug
@@ -51,11 +51,17 @@ config GCOV_FORMAT_AUTODETECT
        ---help---
          Automatically select gcov format based on gcc version.
 
+config GCOV_FORMAT_7
+       bool "GCC 7 format"
+       ---help---
+         Select this option to use the format specified in GCC 7.
+         Works in gcc version range [7, ...).
+
 config GCOV_FORMAT_5
        bool "GCC 5 format"
        ---help---
          Select this option to use the format specified in GCC 5.
-         Works in gcc version range [5, ...).
+         Works in gcc version range [5, 7).
 
 config GCOV_FORMAT_4_9
        bool "GCC 4.9 format"
--- a/xen/common/gcov/Makefile
+++ b/xen/common/gcov/Makefile
@@ -3,7 +3,9 @@ obj-$(CONFIG_GCOV_FORMAT_3_4) += gcc_3_4
 obj-$(CONFIG_GCOV_FORMAT_4_7) += gcc_4_7.o
 obj-$(CONFIG_GCOV_FORMAT_4_9) += gcc_4_9.o
 obj-$(CONFIG_GCOV_FORMAT_5)   += gcc_5.o
+obj-$(CONFIG_GCOV_FORMAT_7)   += gcc_7.o
 obj-$(CONFIG_GCOV_FORMAT_AUTODETECT) += $(call cc-ifversion,lt,0x040700, \
                                                gcc_3_4.o, $(call 
cc-ifversion,lt,0x040900, \
                                                gcc_4_7.o, $(call 
cc-ifversion,lt,0x050000, \
-                                               gcc_4_9.o, gcc_5.o)))
+                                               gcc_4_9.o, $(call 
cc-ifversion,lt,0x070000, \
+                                               gcc_5.o, gcc_7.o))))
--- a/xen/common/gcov/gcc_5.c
+++ b/xen/common/gcov/gcc_5.c
@@ -1,6 +1,6 @@
 /*
  *  This code provides functions to handle gcc's profiling data format
- *  introduced with gcc 4.7.
+ *  introduced with gcc 5.
  *
  *  For a better understanding, refer to gcc source:
  *  gcc/gcov-io.h
@@ -14,7 +14,7 @@
 
 #include "gcov.h"
 
-#if GCC_VERSION < 50000
+#if GCC_VERSION < 50000 || GCC_VERSION >= 70000
 #error "Wrong version of GCC used to compile gcov"
 #endif
 
--- /dev/null
+++ b/xen/common/gcov/gcc_7.c
@@ -0,0 +1,30 @@
+/*
+ *  This code provides functions to handle gcc's profiling data format
+ *  introduced with gcc 7.
+ *
+ *  For a better understanding, refer to gcc source:
+ *  gcc/gcov-io.h
+ *  libgcc/libgcov.c
+ *
+ *  Uses gcc-internal data definitions.
+ */
+
+#include "gcov.h"
+
+#if GCC_VERSION < 70000
+#error "Wrong version of GCC used to compile gcov"
+#endif
+
+#define GCOV_COUNTERS 9
+
+#include "gcc_4_7.c"
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--- a/xen/common/gcov/gcov_base.c
+++ b/xen/common/gcov/gcov_base.c
@@ -31,6 +31,11 @@ void __init __gcov_init(struct gcov_info
  * These functions may be referenced by gcc-generated profiling code but serve
  * no function for Xen.
  */
+void __gcov_exit(void)
+{
+    /* Unused. */
+}
+
 void __gcov_flush(void)
 {
     /* Unused. */




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