libsamplerate0: clean up dependencies

The flac dependency was completely bogus. Flac isn't used at all.

FFTW is only used by tests, so we don't need to provide a packageconfig
for that.

ALSA is only used by example code that isn't part of the packaged files,
so even if ALSA is enabled, it doesn't affect the build result.
Nevertheless, I prefer to disable it explicitly to be extra sure.

--disable-alsa resulted in a warning about an unsupported configure
option, although by some magic it seemed to actually work as expected.
A patch is added to get rid of that warning.

Signed-off-by: Tanu Kaskinen <tanuk@iki.fi>
Signed-off-by: Ross Burton <ross.burton@intel.com>

2 files changed, 70 insertions, 3 deletions

diff --git a/meta/recipes-multimedia/libsamplerate/libsamplerate0/0001-configure.ac-improve-alsa-handling.patch b/meta/recipes-multimedia/libsamplerate/libsamplerate0/0001-configure.ac-improve-alsa-handling.patch
new file mode 100644
index 0000000000..d19b514e6b
--- /dev/null
+++ b/meta/recipes-multimedia/libsamplerate/libsamplerate0/0001-configure.ac-improve-alsa-handling.patch
@@ -0,0 +1,62 @@
+From 957ebce3837588f71016e37ffaf9aad0a9d41cec Mon Sep 17 00:00:00 2001
+From: Tanu Kaskinen <tanuk@iki.fi>
+Date: Fri, 23 Sep 2016 12:02:06 +0300
+Subject: [PATCH] configure.ac: improve alsa handling
+
+Three improvements:
+
+1) "--enable-alsa" or "--disable-alsa" caused a warning about an
+unsupported configure option, because AC_ARG_ENABLE was not used.
+
+2) If alsa was disabled, the "Have ALSA" item in the summary would print
+an empty string instead of "no".
+
+3) If "--enable-alsa" was passed to configure, but the headers were not
+found, configure would still succeed (with alsa disabled). It's better
+to fail and abort configure if a feature that was explicitly requested
+can't be enabled.
+
+Upstream-Status: Submitted [sent to src@mega-nerd.com]
+
+Signed-off-by: Tanu Kaskinen <tanuk@iki.fi>
+---
+ configure.ac | 9 ++++++++-
+ 1 file changed, 8 insertions(+), 1 deletion(-)
+
+diff --git a/configure.ac b/configure.ac
+index 474c6ab..bad597e 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -101,6 +101,9 @@ AC_ARG_ENABLE(cpu-clip,
+ 		AC_HELP_STRING([--disable-cpu-clip], [disable tricky cpu specific clipper]),
+ 		ac_arg_cpu_clip="N", ac_arg_cpu_clip="Y")
+ 
++AC_ARG_ENABLE(alsa,
++                AC_HELP_STRING([--disable-alsa], [disable ALSA support in the varispeed-play example program]))
++
+ #====================================================================================
+ # Check types and their sizes.
+ 
+@@ -194,6 +197,10 @@ if test x$enable_alsa != xno ; then
+ 	if test x$ac_cv_header_alsa_asoundlib_h = xyes ; then
+ 		ALSA_LIBS="-lasound"
+ 		enable_alsa=yes
++        elif test x$enable_alsa = xyes ; then
++                AC_MSG_ERROR(["ALSA headers not found"])
++        else
++                enable_alsa=no
+ 		fi
+ 	fi
+ 
+@@ -340,7 +347,7 @@ AC_MSG_RESULT([
+     Have FFTW : ................... ${ac_cv_fftw3}])
+ 
+ AC_MSG_RESULT([    Have libsndfile : ............. ${ac_cv_sndfile}])
+-AC_MSG_RESULT([    Have ALSA : ................... ${ac_cv_header_alsa_asoundlib_h}
++AC_MSG_RESULT([    Have ALSA : ................... ${enable_alsa}
+ ])
+ 
+ AC_MSG_RESULT([  Installation directories :
+-- 
+2.9.3
+
diff --git a/meta/recipes-multimedia/libsamplerate/libsamplerate0_0.1.9.bb b/meta/recipes-multimedia/libsamplerate/libsamplerate0_0.1.9.bb
index a24b8c7abc..5473bffca4 100644
--- a/meta/recipes-multimedia/libsamplerate/libsamplerate0_0.1.9.bb
+++ b/meta/recipes-multimedia/libsamplerate/libsamplerate0_0.1.9.bb
@@ -4,10 +4,12 @@ SECTION = "libs"
 LICENSE = "BSD-2-Clause"
 LIC_FILES_CHKSUM = "file://COPYING;md5=336d6faf40fb600bafb0061f4052f1f4 \
                     file://src/samplerate.c;beginline=1;endline=7;md5=5b6982a8c2811c7312c13cccbf55f55e"
-DEPENDS = "flac libsndfile1"
+DEPENDS = "libsndfile1"
 PR = "r1"
 
-SRC_URI = "http://www.mega-nerd.com/SRC/libsamplerate-${PV}.tar.gz"
+SRC_URI = "http://www.mega-nerd.com/SRC/libsamplerate-${PV}.tar.gz \
+           file://0001-configure.ac-improve-alsa-handling.patch \
+"
 
 SRC_URI[md5sum] = "2b78ae9fe63b36b9fbb6267fad93f259"
 SRC_URI[sha256sum] = "0a7eb168e2f21353fb6d84da152e4512126f7dc48ccb0be80578c565413444c1"
@@ -18,4 +20,7 @@ S = "${WORKDIR}/libsamplerate-${PV}"
 
 inherit autotools pkgconfig
 
-PACKAGECONFIG[fftw] = ",--disable-fftw,fftw"
+# FFTW and ALSA are only used in tests and examples, so they don't affect
+# normal builds. It should be safe to ignore these, but explicitly disabling
+# them adds some extra certainty that builds are deterministic.
+EXTRA_OECONF = "--disable-fftw --disable-alsa"