build: fix annocheck warnings on i686

Failures found:
Hardened: ./usr/lib/liblzma.so.5.2.4: FAIL: Gaps were detected in the annobin coverage.
Hardened: ./usr/lib/liblzma.so.5.2.4: FAIL: Gaps were detected in the annobin

Resolves: rhbz#1630650
Version: 5.2.4-3

xz.spec

@@ -4,7 +4,7 @@
 Summary:	LZMA compression utilities
 Name:		xz
 Version:	5.2.4
-Release:	2%{?dist}
+Release:	3%{?dist}
 
 # Scripts xz{grep,diff,less,more} and symlinks (copied from gzip) are
 # GPLv2+, binaries are Public Domain (linked against LGPL getopt_long but its
@@ -24,6 +24,7 @@ Requires:	%{name}-libs%{?_isa} = %{version}-%{release}
 # have grepconf, but we're only concerned with F22 here.
 Requires:	grep >= 2.20-5
 
+BuildRequires:	gcc
 BuildRequires:	perl-interpreter
 
 
@@ -83,9 +84,18 @@ commands that deal with the older LZMA format.
 
 
 %build
+export CFLAGS="%optflags"
+
 %ifarch %{power64}
-export CFLAGS="%{optflags} -O3"
+  CFLAGS="$CFLAGS -O3"
 %endif
+
+%ifarch %ix86
+  # rhbz#1630650, annocheck reports the following message because liblzma uses
+  # crc*_x86.S asm code on i686:
+  CFLAGS="$CFLAGS -Wa,--generate-missing-build-notes=yes"
+%endif
+
 %configure
 sed -i 's|^hardcode_libdir_flag_spec=.*|hardcode_libdir_flag_spec=""|g' libtool
 sed -i 's|^runpath_var=LD_RUN_PATH|runpath_var=DIE_RPATH_DIE|g' libtool
@@ -145,6 +155,9 @@ LD_LIBRARY_PATH=$PWD/src/liblzma/.libs make check
 
 
 %changelog
+* Thu Nov 22 2018 Pavel Raiskup <praiskup@redhat.com> - 5.2.4-3
+- fix annocheck failures on i686 (rhbz#1630650)
+
 * Wed May 09 2018 Pavel Raiskup <praiskup@redhat.com> - 5.2.4-2
 - drop ppc64p7 hack, per fedora devel list discussion:
   https://lists.fedoraproject.org/archives/list/