[PATCH v2 1/3] kernel-shark: Reorder the priority when searching for trace-cmd libs

[Yordan Karadzhov <ykaradzhov@vmware.com>]

The CMAKE build system of KernelShark performs automated search for the
trace-cmd libraries, headers and executable before building the GUI.
The new order of the list of directories to search in is the following:

1. ${TRACE_CMD}/  ($TRACE_CMD is an environment variable)

2. CMAKE_SOURCE_DIR/../

3. Platform / system specific locations

Suggested-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Yordan Karadzhov <ykaradzhov@vmware.com>
---
 kernel-shark/build/FindTraceCmd.cmake | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/kernel-shark/build/FindTraceCmd.cmake b/kernel-shark/build/FindTraceCmd.cmake
index fb2092a..b09a11b 100644
--- a/kernel-shark/build/FindTraceCmd.cmake
+++ b/kernel-shark/build/FindTraceCmd.cmake
@@ -14,17 +14,27 @@
 
 # MESSAGE(" Looking for trace-cmd ...")
 
+# First search in the user provided paths.
 find_path(TRACECMD_BIN_DIR      NAMES  trace-cmd
                                 PATHS  $ENV{TRACE_CMD}/tracecmd/
-                                       ${CMAKE_SOURCE_DIR}/../tracecmd/)
+                                       ${CMAKE_SOURCE_DIR}/../tracecmd/
+                                NO_DEFAULT_PATH)
 
 find_path(TRACECMD_INCLUDE_DIR  NAMES  trace-cmd.h
                                 PATHS  $ENV{TRACE_CMD}/include/trace-cmd/
-                                       ${CMAKE_SOURCE_DIR}/../include/trace-cmd/)
+                                       ${CMAKE_SOURCE_DIR}/../include/trace-cmd/
+                                NO_DEFAULT_PATH)
 
 find_path(TRACECMD_LIBRARY_DIR  NAMES  libtracecmd.a
                                 PATHS  $ENV{TRACE_CMD}/lib/trace-cmd/
-                                       ${CMAKE_SOURCE_DIR}/../lib/trace-cmd/)
+                                       ${CMAKE_SOURCE_DIR}/../lib/trace-cmd/
+                                NO_DEFAULT_PATH)
+
+# If not found, search in the default system paths. Note that if the previous
+# search was successful "find_path" will do nothing this time.
+find_path(TRACECMD_BIN_DIR      NAMES  trace-cmd)
+find_path(TRACECMD_INCLUDE_DIR  NAMES  trace-cmd.h)
+find_path(TRACECMD_LIBRARY_DIR  NAMES  libtracecmd.a)
 
 IF (TRACECMD_INCLUDE_DIR AND TRACECMD_LIBRARY_DIR)
 
-- 
2.19.1