package/pifmrds: use pkg-config

Use pkg-config to retrieve libsndfile dependencies

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/pifmrds/0003-Makefile-fix-static-link.patch

@@ -4,6 +4,8 @@ Since libsndfile uses funtions from libm, the -lm should be specified
 after libsndfile for static linking.
 
 Signed-off-by: "Eric Limpens" <Limpens@gmail.com>
+[Fabrice: add $(SNDFILE_LIBS) to pass all dependencies from pkg-config]
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
 
 diff -purN pifmrds-0bf57f9ce0d954365a38d8af8e7be6f28521c3f2.orig/src/Makefile pifmrds-0bf57f9ce0d954365a38d8af8e7be6f28521c3f2/src/Makefile
 --- pifmrds-0bf57f9ce0d954365a38d8af8e7be6f28521c3f2.orig/src/Makefile	2016-02-26 08:06:43.102962592 +0100
@@ -13,11 +15,11 @@ diff -purN pifmrds-0bf57f9ce0d954365a38d8af8e7be6f28521c3f2.orig/src/Makefile pi
  
  app: rds.o waveforms.o pi_fm_rds.o fm_mpx.o control_pipe.o
 -	$(CC) $(LDFLAGS) -o pi_fm_rds rds.o waveforms.o pi_fm_rds.o fm_mpx.o control_pipe.o -lm -lsndfile
-+	$(CC) $(LDFLAGS) -o pi_fm_rds rds.o waveforms.o pi_fm_rds.o fm_mpx.o control_pipe.o -lsndfile -lm
++	$(CC) $(LDFLAGS) -o pi_fm_rds rds.o waveforms.o pi_fm_rds.o fm_mpx.o control_pipe.o $(SNDFILE_LIBS)
  
  rds_wav: rds.o waveforms.o rds_wav.o fm_mpx.o
 -	$(CC) $(LDFLAGS) -o rds_wav rds_wav.o rds.o waveforms.o fm_mpx.o -lm -lsndfile
-+	$(CC) $(LDFLAGS) -o rds_wav rds_wav.o rds.o waveforms.o fm_mpx.o -lsndfile -lm
++	$(CC) $(LDFLAGS) -o rds_wav rds_wav.o rds.o waveforms.o fm_mpx.o $(SNDFILE_LIBS)
  
  rds.o: rds.c waveforms.h
  	$(CC) $(CFLAGS) rds.c

package/pifmrds/pifmrds.mk

@@ -6,13 +6,14 @@
 
 PIFMRDS_VERSION = 0bf57f9ce0d954365a38d8af8e7be6f28521c3f2
 PIFMRDS_SITE = $(call github,ChristopheJacquet,PiFmRds,$(PIFMRDS_VERSION))
-PIFMRDS_DEPENDENCIES = libsndfile
+PIFMRDS_DEPENDENCIES = host-pkgconf libsndfile
 PIFMRDS_LICENSE = GPL-3.0+
 PIFMRDS_LICENSE_FILES = LICENSE
 
 define PIFMRDS_BUILD_CMDS
 	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D)/src CC="$(TARGET_CC)" LDFLAGS="$(TARGET_LDFLAGS)" \
 		CFLAGS="$(TARGET_CFLAGS) -std=gnu99 -ffast-math -c" \
+		SNDFILE_LIBS="`$(PKG_CONFIG_HOST_BINARY) --libs sndfile`" \
 		app rds_wav
 endef