perf: Disable use of libcrypto (Closes: #843199)

debian/changelog

@@ -120,6 +120,7 @@ linux (4.8.6-1) UNRELEASED; urgency=medium
     - drivers/zram: Don't disable preemption in zcomp_stream_get/put()
   * HID: Enable HID_ALPS, HID_ASUS (Closes: #843085), HID_CMEDIA as modules
   * cpupower: Fix checks for CPU existence (Closes: #843071)
+  * perf: Disable use of libcrypto (Closes: #843199)
 
  -- Ben Hutchings <ben@decadent.org.uk>  Wed, 02 Nov 2016 12:01:42 -0600
 

debian/rules.d/tools/perf/Makefile

@@ -43,6 +43,11 @@ MAKE_PERF += perfexecdir=lib/perf_$(VERSION)-core plugindir=/usr/lib/traceevent_
 # cplus_demangle() can be found in libiberty (LGPL v2.1+).
 MAKE_PERF += feature-libbfd=0 HAVE_CPLUS_DEMANGLE_SUPPORT=1
 
+# perf can link against libcrypto if available, but the result is
+# undistributable as GPL v2 and OpenSSL are not compatible without
+# an explicit exception.  Override detection of libcrypto.
+MAKE_PERF += NO_LIBCRYPTO=1
+
 all:
 ifdef KERNEL_ARCH_PERF
 # perf changes some default directories depending on whether DESTDIR is
@@ -52,9 +57,9 @@ ifdef KERNEL_ARCH_PERF
 ifeq (,$(filter nodoc,$(DEB_BUILD_PROFILES)))
 	+$(MAKE_PERF) -C $(top_srcdir)/tools/perf/Documentation man VERSION=$(VERSION)
 endif
-# Check that perf didn't get linked against libbfd
+# Check that perf didn't get linked against libbfd or libcrypto
 	type ldd
-	! ldd $(CURDIR)/perf | grep '\blibbfd'
+	! ldd $(CURDIR)/perf | grep -E '\blib(bfd|crypto)'
 # Check that it includes cplus_demangle from libiberty
 	grep cplus_demangle $(CURDIR)/perf
 endif