[PATCH] Don't look for kernel version if not running on linux

[Ulf Hermann]

We don't want to use it, even if it exists.

Signed-off-by: Ulf Hermann <ulf.hermann@qt.io>
---
 libdwfl/ChangeLog              | 5 +++++
 libdwfl/linux-kernel-modules.c | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/libdwfl/ChangeLog b/libdwfl/ChangeLog
index de73d79..80346d5 100644
--- a/libdwfl/ChangeLog
+++ b/libdwfl/ChangeLog
@@ -1,5 +1,10 @@
 2017-04-20  Ulf Hermann  <ulf.hermann@qt.io>
 
+	* linux-kernel-modules.c: Always return NULL from kernel_release() on
+	non-linux systems.
+
+2017-04-20  Ulf Hermann  <ulf.hermann@qt.io>
+
 	* dwfl_module_getdwarf.c: Check shnum for 0 before subtracting from
 	it.
 
diff --git a/libdwfl/linux-kernel-modules.c b/libdwfl/linux-kernel-modules.c
index 757eace..381711a 100644
--- a/libdwfl/linux-kernel-modules.c
+++ b/libdwfl/linux-kernel-modules.c
@@ -156,11 +156,15 @@ try_kernel_name (Dwfl *dwfl, char **fname, bool try_debug)
 static inline const char *
 kernel_release (void)
 {
+#ifdef __linux__
   /* Cache the `uname -r` string we'll use.  */
   static struct utsname utsname;
   if (utsname.release[0] == '\0' && uname (&utsname) != 0)
     return NULL;
   return utsname.release;
+#else
+  return NULL;
+#endif
 }
 
 static int
-- 
2.1.4