package/fftw: break fftw-single into a dedicated package

fftw's library name depends on the precision option. Consequently,
it's possible to install multiple flavor on the same target.

This patch breaks fftw single precision into a new package and:

- makes BR2_PACKAGE_FFTW_PRECISION_SINGLE select
  BR2_PACKAGE_FFTW_SINGLE to keep compatibility with packages that use
  BR2_PACKAGE_FFTW_PRECISION_SINGLE. This option will be removed in a
  follow-up commit;

- removes the BR2_PACKAGE_FFTW_USE_SSE and BR2_PACKAGE_FFTW_USE_NEON
  otpions since they are only used for single precision. The
  corresponding CPU-capability options are directly handled in
  the fftw-single package;

- makes fftw depend on fftw-single when this package is enabled.

Signed-off-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
[Yann/Thomas:
 - Force --disable-single in FFTW_CONF_OPTS, just for the sake of
   clarity (fftw is no longer going to build the single variant)
 - Use FFTW_SINGLE_DL_SUBDIR to avoid downloading fftw multiple times
 - Minor reformatting tweaks in fftw-single.mk
 - Do not deprecate BR2_PACKAGE_FFTW_PRECISION_SINGLE and instead make
   it select BR2_PACKAGE_FFTW_SINGLE, so that packages using
   BR2_PACKAGE_FFTW_PRECISION_SINGLE continue to work.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Tested-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

3 files changed, 43 insertions, 0 deletions

diff --git a/package/fftw/fftw-single/Config.in b/package/fftw/fftw-single/Config.in
new file mode 100644
index 0000000000..ff1486871d
--- /dev/null
+++ b/package/fftw/fftw-single/Config.in
@@ -0,0 +1,5 @@
+config BR2_PACKAGE_FFTW_SINGLE
+	bool "fftw-single"
+	help
+	  Compile fftw in single precision, i.e. use 'float'
+	  for floating point type.
diff --git a/package/fftw/fftw-single/fftw-single.hash b/package/fftw/fftw-single/fftw-single.hash
new file mode 120000
index 0000000000..3ee7ecb3ba
--- /dev/null
+++ b/package/fftw/fftw-single/fftw-single.hash
@@ -0,0 +1 @@
+../fftw.hash
\ No newline at end of file
diff --git a/package/fftw/fftw-single/fftw-single.mk b/package/fftw/fftw-single/fftw-single.mk
new file mode 100644
index 0000000000..1e26ff7a38
--- /dev/null
+++ b/package/fftw/fftw-single/fftw-single.mk
@@ -0,0 +1,37 @@
+################################################################################
+#
+# fftw-single
+#
+################################################################################
+
+FFTW_SINGLE_VERSION = $(FFTW_VERSION)
+FFTW_SINGLE_SOURCE = fftw-$(FFTW_VERSION).tar.gz
+FFTW_SINGLE_SITE = $(FFTW_SITE)
+FFTW_SINGLE_DL_SUBDIR = fftw
+FFTW_SINGLE_INSTALL_STAGING = $(FFTW_INSTALL_STAGING)
+FFTW_SINGLE_LICENSE = $(FFTW_LICENSE)
+FFTW_SINGLE_LICENSE_FILES = $(FFTW_LICENSE_FILES)
+
+FFTW_SINGLE_CONF_ENV = $(FFTW_COMMON_CONF_ENV)
+
+FFTW_SINGLE_CONF_OPTS = \
+	$(FFTW_COMMON_CONF_OPTS) \
+	CFLAGS="$(FFTW_SINGLE_CFLAGS)" \
+	--enable-single
+
+FFTW_SINGLE_CFLAGS = $(FFTW_COMMON_CFLAGS)
+
+# x86 optimisations
+FFTW_SINGLE_CONF_OPTS += \
+	$(if $(BR2_X86_CPU_HAS_SSE),--enable,--disable)-sse \
+	$(if $(BR2_X86_CPU_HAS_SSE2),--enable,--disable)-sse2
+
+# ARM optimisations
+ifeq ($(BR2_ARM_CPU_HAS_NEON):$(BR2_ARM_SOFT_FLOAT),y:)
+FFTW_SINGLE_CONF_OPTS += --enable-neon
+FFTW_SINGLE_CFLAGS += -mfpu=neon
+else
+FFTW_SINGLE_CONF_OPTS += --disable-neon
+endif
+
+$(eval $(autotools-package))