From e16f5f8cab650813773bafbca2383cfeaad00131 Mon Sep 17 00:00:00 2001
From: Ian Rogers <irogers@google.com>
Date: Fri, 10 Sep 2021 15:57:56 -0700
Subject: [PATCH] perf tools: Add an option to build without libbfd

[ Upstream commit 0d1c50ac488ebdaeeaea8ed5069f8d435fd485ed ]

Some distributions, like debian, don't link perf with libbfd. Add a
build flag to make this configuration buildable and testable.

This was inspired by:

  https://lore.kernel.org/linux-perf-users/20210910102307.2055484-1-tonyg@leastfixedpoint.com/T/#u

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: tony garnock-jones <tonyg@leastfixedpoint.com>
Link: http://lore.kernel.org/lkml/20210910225756.729087-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Stable-dep-of: 7822a8913f4c ("perf build: Update build rule for generated files")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 tools/perf/Makefile.config | 51 ++++++++++++++++++++------------------
 1 file changed, 27 insertions(+), 24 deletions(-)

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 3e7706c251e9..89905b4e9309 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -824,33 +824,36 @@ else
   endif
 endif
 
-ifeq ($(feature-libbfd), 1)
-  EXTLIBS += -lbfd -lopcodes
-else
-  # we are on a system that requires -liberty and (maybe) -lz
-  # to link against -lbfd; test each case individually here
 
-  # call all detections now so we get correct
-  # status in VF output
-  $(call feature_check,libbfd-liberty)
-  $(call feature_check,libbfd-liberty-z)
-
-  ifeq ($(feature-libbfd-liberty), 1)
-    EXTLIBS += -lbfd -lopcodes -liberty
-    FEATURE_CHECK_LDFLAGS-disassembler-four-args += -liberty -ldl
+ifndef NO_LIBBFD
+  ifeq ($(feature-libbfd), 1)
+    EXTLIBS += -lbfd -lopcodes
   else
-    ifeq ($(feature-libbfd-liberty-z), 1)
-      EXTLIBS += -lbfd -lopcodes -liberty -lz
-      FEATURE_CHECK_LDFLAGS-disassembler-four-args += -liberty -lz -ldl
-    endif
-  endif
-  $(call feature_check,disassembler-four-args)
-endif
+    # we are on a system that requires -liberty and (maybe) -lz
+    # to link against -lbfd; test each case individually here
 
-ifeq ($(feature-libbfd-buildid), 1)
-  CFLAGS += -DHAVE_LIBBFD_BUILDID_SUPPORT
-else
-  msg := $(warning Old version of libbfd/binutils things like PE executable profiling will not be available);
+    # call all detections now so we get correct
+    # status in VF output
+    $(call feature_check,libbfd-liberty)
+    $(call feature_check,libbfd-liberty-z)
+
+    ifeq ($(feature-libbfd-liberty), 1)
+      EXTLIBS += -lbfd -lopcodes -liberty
+      FEATURE_CHECK_LDFLAGS-disassembler-four-args += -liberty -ldl
+    else
+      ifeq ($(feature-libbfd-liberty-z), 1)
+        EXTLIBS += -lbfd -lopcodes -liberty -lz
+        FEATURE_CHECK_LDFLAGS-disassembler-four-args += -liberty -lz -ldl
+      endif
+    endif
+    $(call feature_check,disassembler-four-args)
+  endif
+
+  ifeq ($(feature-libbfd-buildid), 1)
+    CFLAGS += -DHAVE_LIBBFD_BUILDID_SUPPORT
+  else
+    msg := $(warning Old version of libbfd/binutils things like PE executable profiling will not be available);
+  endif
 endif
 
 ifdef NO_DEMANGLE