[Buildroot] [PATCH v3 02/17] package/fftw: break fftw-single into a dedicated package

[Thomas Petazzoni <thomas.petazzoni@bootlin.com>]

From: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>

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>
---
 package/fftw/Config.in                    | 12 ++------
 package/fftw/fftw-single/Config.in        |  5 +++
 package/fftw/fftw-single/fftw-single.hash |  1 +
 package/fftw/fftw-single/fftw-single.mk   | 37 +++++++++++++++++++++++
 package/fftw/fftw.mk                      | 14 +++++----
 5 files changed, 54 insertions(+), 15 deletions(-)
 create mode 100644 package/fftw/fftw-single/Config.in
 create mode 120000 package/fftw/fftw-single/fftw-single.hash
 create mode 100644 package/fftw/fftw-single/fftw-single.mk

diff --git a/package/fftw/Config.in b/package/fftw/Config.in
index d51f8f3c51..f61784de50 100644
--- a/package/fftw/Config.in
+++ b/package/fftw/Config.in
@@ -12,15 +12,9 @@ config BR2_PACKAGE_FFTW
 
 if BR2_PACKAGE_FFTW
 
-config BR2_PACKAGE_FFTW_USE_SSE
-	bool
-
 config BR2_PACKAGE_FFTW_USE_SSE2
 	bool
 
-config BR2_PACKAGE_FFTW_USE_NEON
-	bool
-
 choice
 	prompt "fftw precision"
 	default BR2_PACKAGE_FFTW_PRECISION_DOUBLE
@@ -29,9 +23,7 @@ choice
 
 config BR2_PACKAGE_FFTW_PRECISION_SINGLE
 	bool "single"
-	select BR2_PACKAGE_FFTW_USE_SSE if BR2_X86_CPU_HAS_SSE
-	select BR2_PACKAGE_FFTW_USE_SSE2 if BR2_X86_CPU_HAS_SSE2
-	select BR2_PACKAGE_FFTW_USE_NEON if BR2_ARM_CPU_HAS_NEON && !BR2_ARM_SOFT_FLOAT
+	select BR2_PACKAGE_FFTW_SINGLE
 	help
 	  Compile fftw in single precision, i.e. use 'float' for
 	  floating point type.
@@ -62,6 +54,8 @@ config BR2_PACKAGE_FFTW_PRECISION_QUAD
 
 endchoice
 
+source "package/fftw/fftw-single/Config.in"
+
 config BR2_PACKAGE_FFTW_FAST
 	bool "optimise for speed over accuracy"
 	help
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))
diff --git a/package/fftw/fftw.mk b/package/fftw/fftw.mk
index 8b76b7c190..b738928032 100644
--- a/package/fftw/fftw.mk
+++ b/package/fftw/fftw.mk
@@ -10,6 +10,10 @@ FFTW_INSTALL_STAGING = YES
 FFTW_LICENSE = GPL-2.0+
 FFTW_LICENSE_FILES = COPYING
 
+ifeq ($(BR2_PACKAGE_FFTW_SINGLE),y)
+FFTW_DEPENDENCIES += fftw-single
+endif
+
 # fortran support only enables generation and installation of fortran sources
 ifeq ($(BR2_TOOLCHAIN_HAS_FORTRAN),y)
 FFTW_COMMON_CONF_OPTS += --enable-fortran
@@ -19,18 +23,14 @@ FFTW_COMMON_CONF_OPTS += --disable-fortran
 endif
 
 FFTW_COMMON_CFLAGS = $(TARGET_CFLAGS)
+
 ifeq ($(BR2_PACKAGE_FFTW_FAST),y)
 FFTW_COMMON_CFLAGS += -O3 -ffast-math
 endif
 
 # x86 optimisations
-FFTW_COMMON_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_USE_SSE),--enable,--disable)-sse
 FFTW_COMMON_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_USE_SSE2),--enable,--disable)-sse2
 
-# ARM optimisations
-FFTW_COMMON_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_USE_NEON),--enable,--disable)-neon
-FFTW_COMMON_CFLAGS += $(if $(BR2_PACKAGE_FFTW_USE_NEON),-mfpu=neon)
-
 # Generic optimisations
 ifeq ($(BR2_TOOLCHAIN_HAS_THREADS),y)
 FFTW_COMMON_CONF_OPTS += --enable-threads
@@ -43,9 +43,11 @@ FFTW_COMMON_CONF_OPTS += $(if $(BR2_GCC_ENABLE_OPENMP),--enable,--disable)-openm
 FFTW_CONF_ENV = $(FFTW_COMMON_CONF_ENV)
 FFTW_CONF_OPTS += \
 	$(FFTW_COMMON_CONF_OPTS) \
-	$(if $(BR2_PACKAGE_FFTW_PRECISION_SINGLE),--enable,--disable)-single \
+	--disable-single \
 	$(if $(BR2_PACKAGE_FFTW_PRECISION_LONG_DOUBLE),--enable,--disable)-long-double \
 	$(if $(BR2_PACKAGE_FFTW_PRECISION_QUAD),--enable,--disable)-quad-precision \
 	CFLAGS="$(FFTW_COMMON_CFLAGS)"
 
 $(eval $(autotools-package))
+
+include $(sort $(wildcard package/fftw/*/*.mk))
-- 
2.20.1