[PATCH 2/5] perf, tools: Add one liner warning for disabled features

[Andi Kleen]

From: Andi Kleen <ak@xxxxxxxxxxxxxxx>

Add a one liner warning for perf features that need to be enabled
explicitly by the user, so that they know they are missing something.
Currently enabled for XED and BABELTRACE.

Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
---
 tools/perf/Makefile.config | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 9996027e7a52..39b90ffd9412 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -65,6 +65,8 @@ ifneq ($(ARCH),$(filter $(ARCH),x86 arm))
   NO_LIBDW_DWARF_UNWIND := 1
 endif
 
+DISABLED_FEATURES =
+
 ifeq ($(LIBUNWIND_LIBS),)
   NO_LIBUNWIND := 1
 endif
@@ -698,6 +700,8 @@ ifdef XED
     EXTLIBS += -lxed
     $(call detected,CONFIG_XED)
   endif
+else
+  DISABLED_FEATURES += XED
 endif
 
 ifndef NO_LZMA
@@ -772,6 +776,8 @@ ifdef LIBBABELTRACE
   else
     msg := $(warning No libbabeltrace found, disables 'perf data' CTF format support, please install libbabeltrace-dev[el]/libbabeltrace-ctf-dev);
   endif
+else
+  DISABLED_FEATURES += LIBBABELTRACE
 endif
 
 ifndef NO_AUXTRACE
@@ -843,6 +849,10 @@ ifdef LIBCLANGLLVM
   endif
 endif
 
+ifneq ($(DISABLED_FEATURES),)
+  $(warning Disabled features, need explicit enabling by user: $(DISABLED_FEATURES))
+endif
+
 # Among the variables below, these:
 #   perfexecdir
 #   template_dir
-- 
2.9.3