[PATCH] tools/libxc: Fix use of zlib-options when building the domain builder

[Andrew Cooper <andrew.cooper3@citrix.com>]

c/s de0f8c7c changed the use of zlib-options, and moved it from being locally
generated to coming from ./configure.

However, it neglected to modify the users of zlib-options.  The curious use of
$(call ...) was to select either the -D or -l options as appropriate, but c/s
de0f8c7c broke this by loosing the `grep`.

Instead, use $(filter ...) to pick out either the -D or -l options.  This
fixes the build with Clang, which complains at passing '-llzma' when trying
to compile xc_dom_bzimageloader.c to xc_dom_bzimageloader.o.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: Roger Pau Monne <roger.pau@citrix.com>
CC: Ian Campbell <Ian.Campbell@citrix.com>
CC: Ian Jackson <Ian.Jackson@eu.citrix.com>
CC: Wei Liu <wei.liu2@citrix.com>
---
 tools/libxc/Makefile | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/libxc/Makefile b/tools/libxc/Makefile
index 0a8614c..608404f 100644
--- a/tools/libxc/Makefile
+++ b/tools/libxc/Makefile
@@ -226,10 +226,10 @@ else
 zlib-options = $(ZLIB)
 endif
 
-xc_dom_bzimageloader.o: CFLAGS += $(call zlib-options,D)
-xc_dom_bzimageloader.opic: CFLAGS += $(call zlib-options,D)
+xc_dom_bzimageloader.o: CFLAGS += $(filter -D%,$(zlib-options))
+xc_dom_bzimageloader.opic: CFLAGS += $(filter -D%,$(zlib-options))
 
-libxenguest.so.$(MAJOR).$(MINOR): COMPRESSION_LIBS = $(call zlib-options,l)
+libxenguest.so.$(MAJOR).$(MINOR): COMPRESSION_LIBS = $(filter -l%,$(zlib-options))
 libxenguest.so.$(MAJOR).$(MINOR): $(GUEST_PIC_OBJS) libxenctrl.so
 	$(CC) $(LDFLAGS) -Wl,$(SONAME_LDFLAG) -Wl,libxenguest.so.$(MAJOR) $(SHLIB_LDFLAGS) -o $@ $(GUEST_PIC_OBJS) $(COMPRESSION_LIBS) -lz $(LDLIBS_libxenevtchn) $(LDLIBS_libxenctrl) $(PTHREAD_LIBS) $(APPEND_LDFLAGS)
 
-- 
2.1.4