perf build: Make binutil libraries opt in

binutils is GPLv3 so distributions cannot ship perf linked against
libbfd and libiberty as the licenses are incompatible. Rather than
defaulting the build to opting in to libbfd and libiberty support and
opting out via NO_LIBBFD=1 and NO_DEMANGLE=1, make building against
the libraries optional and enabled with BUILD_NONDISTRO=1.

Signed-off-by: Ian Rogers <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andres Freund <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Martin Liška <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Nathan Chancellor <[email protected]>
Cc: Nick Desaulniers <[email protected]>
Cc: Pavithra Gurushankar <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Quentin Monnet <[email protected]>
Cc: Roberto Sassu <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Tiezhu Yang <[email protected]>
Cc: Tom Rix <[email protected]>
Cc: Yang Jihong <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

tools/perf/Makefile.config

@@ -890,7 +890,7 @@ ifneq ($(NO_JEVENTS),1)
   endif
 endif
 
-ifndef NO_LIBBFD
+ifdef BUILD_NONDISTRO
   ifeq ($(feature-libbfd), 1)
     EXTLIBS += -lbfd -lopcodes
   else
@@ -913,6 +913,7 @@ ifndef NO_LIBBFD
     $(call feature_check,disassembler-init-styled)
   endif
 
+  CFLAGS += -DHAVE_LIBBFD_SUPPORT
   ifeq ($(feature-libbfd-buildid), 1)
     CFLAGS += -DHAVE_LIBBFD_BUILDID_SUPPORT
   else
@@ -923,32 +924,26 @@ endif
 ifdef NO_DEMANGLE
   CFLAGS += -DNO_DEMANGLE
 else
-  ifdef HAVE_CPLUS_DEMANGLE_SUPPORT
-    EXTLIBS += -liberty
-  else
+  ifdef BUILD_NONDISTRO
     ifeq ($(filter -liberty,$(EXTLIBS)),)
-      $(call feature_check,cplus-demangle)
-
-      # we dont have neither HAVE_CPLUS_DEMANGLE_SUPPORT
-      # or any of 'bfd iberty z' trinity
-      ifeq ($(feature-cplus-demangle), 1)
+      ifdef HAVE_CPLUS_DEMANGLE_SUPPORT
         EXTLIBS += -liberty
       else
-        msg := $(warning No bfd.h/libbfd found, please install binutils-dev[el]/zlib-static/libiberty-dev to gain symbol demangling)
-        CFLAGS += -DNO_DEMANGLE
+        $(call feature_check,cplus-demangle)
+        ifeq ($(feature-cplus-demangle), 1)
+          EXTLIBS += -liberty
+        endif
       endif
     endif
   endif
 
   ifneq ($(filter -liberty,$(EXTLIBS)),)
     CFLAGS += -DHAVE_CPLUS_DEMANGLE_SUPPORT
+  else
+    CFLAGS += -DNO_DEMANGLE
   endif
 endif
 
-ifneq ($(filter -lbfd,$(EXTLIBS)),)
-  CFLAGS += -DHAVE_LIBBFD_SUPPORT
-endif
-
 ifndef NO_ZLIB
   ifeq ($(feature-zlib), 1)
     CFLAGS += -DHAVE_ZLIB_SUPPORT

tools/perf/Makefile.perf

@@ -128,6 +128,8 @@ include ../scripts/utilities.mak
 #
 # Define NO_BPF_SKEL to disable BPF skeletons
 #
+# Define BUILD_NONDISTRO to enable building an linking against libbfd and
+# libiberty distribution license incompatible libraries.
 
 # As per kernel Makefile, avoid funny character set dependencies
 unexport LC_ALL

tools/perf/tests/make

@@ -68,6 +68,7 @@ python_perf_so := $(shell $(MAKE) python_perf_target|grep "Target is:"|awk '{pri
 make_clean_all      := clean all
 make_python_perf_so := $(python_perf_so)
 make_debug          := DEBUG=1
+make_nondistro      := BUILD_NONDISTRO=1
 make_no_libperl     := NO_LIBPERL=1
 make_no_libpython   := NO_LIBPYTHON=1
 make_no_scripts     := NO_LIBPYTHON=1 NO_LIBPERL=1
@@ -134,6 +135,7 @@ MAKE_F := $(MAKE) -f $(MK)
 endif
 run += make_python_perf_so
 run += make_debug
+run += make_nondistro
 run += make_no_libperl
 run += make_no_libpython
 run += make_no_scripts