Only check for requested features in the Makefile

Libpci is no longer required to build flashrom and will not be checked
for if no PCI code is needed for the selected programmers.
libftdi is no longer checked for if FT2232 support is not selected.

With this patch, it is possible to build on pretty much every OS out
there (including Windows) without altering the Makefile.
Some gcc versions may need a CFLAGS override for a warning in
dummyflasher.c, though.

Corresponding to flashrom svn r823.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Idwer Vollering <vidwer@gmail.com>

Makefile

@@ -41,8 +41,6 @@ CFLAGS += -I/usr/local/include
 LDFLAGS += -L/usr/local/lib
 endif
 
-LIBS += -lpci
-
 OBJS = jedec.o stm50flw0x0x.o w39v080fa.o sharplhf00l04.o w29ee011.o \
 	sst28sf040.o am29f040b.o mx29f002.o m29f400bt.o pm29f002.o w39v040c.o \
 	w49f002u.o 82802ab.o pm49fl00x.o sst49lf040.o en29f002a.o m29f002.o \
@@ -167,6 +165,7 @@ endif
 endif
 
 ifeq ($(NEED_PCI), yes)
+LIBS += -lpci
 FEATURE_CFLAGS += -D'NEED_PCI=1'
 OBJS += pcidev.o physmap.o internal.o
 endif
@@ -211,6 +210,7 @@ compiler:
 		rm -f .test.c .test; exit 1)
 	@rm -f .test.c .test
 
+ifeq ($(NEED_PCI), yes)
 pciutils: compiler
 	@printf "Checking for libpci headers... "
 	@$(shell ( echo "#include <pci/pci.h>";		   \
@@ -226,25 +226,30 @@ pciutils: compiler
 	@$(shell ( echo "#include <pci/pci.h>";		   \
 		   echo "int main(int argc, char **argv)"; \
 		   echo "{ return 0; }"; ) > .test1.c )
-	@$(CC) $(CFLAGS) $(LDFLAGS) .test1.c -o .test1 $(LIBS) >/dev/null 2>&1 &&	\
+	@$(CC) $(CFLAGS) $(LDFLAGS) .test1.c -o .test1 -lpci $(LIBS) >/dev/null 2>&1 &&	\
 		echo "found." || ( echo "not found."; echo;				\
 		echo "Please install libpci (package pciutils).";			\
 		echo "See README for more information."; echo;				\
 		rm -f .test1.c .test1; exit 1)
 	@printf "Checking if libpci is sufficient... "
 	@printf "" > .libdeps
-	@$(CC) $(LDFLAGS) .test.o -o .test $(LIBS) >/dev/null 2>&1 &&				\
+	@$(CC) $(LDFLAGS) .test.o -o .test -lpci $(LIBS) >/dev/null 2>&1 &&				\
 		echo "yes." || ( echo "no.";							\
 		printf "Checking if libz is present and supplies all needed symbols...";	\
-		$(CC) $(LDFLAGS) .test.o -o .test $(LIBS) -lz >/dev/null 2>&1 &&		\
+		$(CC) $(LDFLAGS) .test.o -o .test -lpci -lz $(LIBS) >/dev/null 2>&1 &&		\
 		( echo "yes."; echo "NEEDLIBZ := yes" > .libdeps ) || ( echo "no."; echo;	\
 		echo "Please install libz.";			\
 		echo "See README for more information."; echo;				\
 		rm -f .test.c .test.o .test; exit 1) )
 	@rm -f .test.c .test.o .test .test1.c .test1
+else
+pciutils: compiler
+	@printf "" > .libdeps
+endif
 
 .features: features
 
+ifeq ($(CONFIG_FT2232SPI), yes)
 features: compiler
 	@echo "FEATURES := yes" > .features.tmp
 	@printf "Checking for FTDI support... "
@@ -257,6 +262,10 @@ features: compiler
 		( echo "not found."; echo "FTDISUPPORT := no" >> .features.tmp )
 	@$(DIFF) -q .features.tmp .features >/dev/null 2>&1 && rm .features.tmp || mv .features.tmp .features
 	@rm -f .featuretest.c .featuretest
+else
+features: compiler
+	@echo "FEATURES := yes" > .features
+endif
 
 install: $(PROGRAM)
 	mkdir -p $(DESTDIR)$(PREFIX)/sbin