libiberty is license incompatible with perf and building requires the
BUILD_NONDISTRO=1 build flag. libiberty is used for
HAVE_CPLUS_DEMANGLE_SUPPORT. Remove the code to simplify the code base
as it can't be distributed. Remove the BUILD_NONDISTRO build flag and
test as they no longer enable/disable support.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/Makefile.config       | 12 ------------
 tools/perf/Makefile.perf         | 11 ++++-------
 tools/perf/tests/make            |  2 --
 tools/perf/util/demangle-cxx.cpp | 13 +------------
 tools/perf/util/symbol-elf.c     |  7 -------
 tools/perf/util/symbol.c         |  6 ------
 6 files changed, 5 insertions(+), 46 deletions(-)

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index b63c952b10ce..7bc9985264a7 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -954,18 +954,6 @@ ifndef NO_DEMANGLE
     CXXFLAGS += -DHAVE_CXA_DEMANGLE_SUPPORT
     $(call detected,CONFIG_CXX_DEMANGLE)
   endif
-  ifdef BUILD_NONDISTRO
-    ifeq ($(filter -liberty,$(EXTLIBS)),)
-      $(call feature_check,cplus-demangle)
-      ifeq ($(feature-cplus-demangle), 1)
-        EXTLIBS += -liberty
-      endif
-    endif
-    ifneq ($(filter -liberty,$(EXTLIBS)),)
-      CFLAGS += -DHAVE_CPLUS_DEMANGLE_SUPPORT
-      CXXFLAGS += -DHAVE_CPLUS_DEMANGLE_SUPPORT
-    endif
-  endif
 endif
 
 ifndef NO_LZMA
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 116c935c06f7..727b7412aab0 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -120,9 +120,6 @@ include ../scripts/utilities.mak
 #
 # Set BUILD_BPF_SKEL to 0 to override BUILD_BPF_SKEL and not build BPF skeletons
 #
-# Define BUILD_NONDISTRO to enable building an linking against libbfd and
-# libiberty distribution license incompatible libraries.
-#
 # Define EXTRA_TESTS to enable building extra tests useful mainly to perf
 # developers, such as:
 #	x86 instruction decoder - new instructions test
@@ -297,10 +294,10 @@ LIBSYMBOL_DIR   = $(srctree)/tools/lib/symbol/
 LIBPERF_DIR     = $(srctree)/tools/lib/perf/
 DOC_DIR         = $(srctree)/tools/perf/Documentation/
 
-# Set FEATURE_TESTS to 'all' so all possible feature checkers are executed.
-# Without this setting the output feature dump file misses some features, for
-# example, liberty. Select all checkers so we won't get an incomplete feature
-# dump file.
+# Set FEATURE_TESTS to 'all' so all possible feature checkers are
+# executed.  Without this setting the output feature dump file misses
+# some features. Select all checkers so we won't get an incomplete
+# feature dump file.
 ifeq ($(config),1)
 ifdef MAKECMDGOALS
 ifeq ($(filter feature-dump,$(MAKECMDGOALS)),feature-dump)
diff --git a/tools/perf/tests/make b/tools/perf/tests/make
index 301cda63a27f..112423076e1c 100644
--- a/tools/perf/tests/make
+++ b/tools/perf/tests/make
@@ -68,7 +68,6 @@ 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_extra_tests    := EXTRA_TESTS=1
 make_jevents_all    := JEVENTS_ARCH=all
 make_no_bpf_skel    := BUILD_BPF_SKEL=0
@@ -139,7 +138,6 @@ MAKE_F := $(MAKE) -f $(MK)
 endif
 run += make_python_perf_so
 run += make_debug
-run += make_nondistro
 run += make_extra_tests
 run += make_jevents_all
 run += make_no_bpf_skel
diff --git a/tools/perf/util/demangle-cxx.cpp b/tools/perf/util/demangle-cxx.cpp
index bd657eb37efc..36801ea327a6 100644
--- a/tools/perf/util/demangle-cxx.cpp
+++ b/tools/perf/util/demangle-cxx.cpp
@@ -8,13 +8,6 @@
 #include <cxxabi.h>
 #endif
 
-#if defined(HAVE_CPLUS_DEMANGLE_SUPPORT)
-#ifndef DMGL_PARAMS
-#define DMGL_PARAMS     (1 << 0)  /* Include function args */
-#define DMGL_ANSI       (1 << 1)  /* Include const, volatile, etc */
-#endif
-#endif
-
 /*
  * Demangle C++ function signature
  *
@@ -24,11 +17,7 @@ extern "C"
 char *cxx_demangle_sym(const char *str, bool params __maybe_unused,
                        bool modifiers __maybe_unused)
 {
-#if defined(HAVE_CPLUS_DEMANGLE_SUPPORT)
-        int flags = (params ? DMGL_PARAMS : 0) | (modifiers ? DMGL_ANSI : 0);
-
-        return cplus_demangle(str, flags);
-#elif defined(HAVE_CXA_DEMANGLE_SUPPORT)
+#if defined(HAVE_CXA_DEMANGLE_SUPPORT)
         char *output;
         int status;
 
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index c6013f9fdc1a..b17386372882 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -24,13 +24,6 @@
 #include <symbol/kallsyms.h>
 #include <internal/lib.h>
 
-#if defined(HAVE_CPLUS_DEMANGLE_SUPPORT)
-#ifndef DMGL_PARAMS
-#define DMGL_PARAMS     (1 << 0)  /* Include function args */
-#define DMGL_ANSI       (1 << 1)  /* Include const, volatile, etc */
-#endif
-#endif
-
 #ifndef EM_AARCH64
 #define EM_AARCH64	183  /* ARM 64 bit */
 #endif
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index c058d6a01509..0d1220e12205 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -2535,13 +2535,7 @@ static bool want_demangle(bool is_kernel_sym)
 char *cxx_demangle_sym(const char *str __maybe_unused, bool params __maybe_unused,
 		       bool modifiers __maybe_unused)
 {
-#if defined(HAVE_CPLUS_DEMANGLE_SUPPORT)
-	int flags = (params ? DMGL_PARAMS : 0) | (modifiers ? DMGL_ANSI : 0);
-
-	return cplus_demangle(str, flags);
-#else
 	return NULL;
-#endif
 }
 #endif /* !HAVE_CXA_DEMANGLE_SUPPORT */
 
-- 
2.51.0.rc2.233.g662b1ed5c5-goog