package/gemmlowp: new package

This package is required by tensorflow-lite.

Tested-by: Stefan Hager <stefan.hager@ginzinger.com>
Signed-off-by: Stefan Hager <stefan.hager@ginzinger.com>
Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

DEVELOPERS

@@ -3034,6 +3034,7 @@ F:	package/ti-gfx/
 
 N:	Stefan Hager <stefan.hager@ginzinger.com>
 F:	package/cpuinfo/
+F:	package/gemmlowp/
 F:	package/ruy/
 
 N:	Stefan Nickl <Stefan.Nickl@gmail.com>

package/Config.in

@@ -2190,6 +2190,7 @@ menu "Other"
 	source "package/fxdiv/Config.in"
 	source "package/gconf/Config.in"
 	source "package/gdal/Config.in"
+	source "package/gemmlowp/Config.in"
 	source "package/gflags/Config.in"
 	source "package/gli/Config.in"
 	source "package/glibmm/Config.in"

package/gemmlowp/Config.in

@@ -0,0 +1,12 @@
+config BR2_PACKAGE_GEMMLOWP
+	bool "gemmlowp"
+	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 # C++11
+	help
+	  Low-precision matrix multiplication.
+
+	  https://github.com/google/gemmlowp
+
+comment "gemmlowp needs a toolchain w/ C++11"
+	depends on !BR2_INSTALL_LIBSTDCPP || \
+		!BR2_TOOLCHAIN_GCC_AT_LEAST_4_8

package/gemmlowp/gemmlowp.hash

@@ -0,0 +1,4 @@
+# Locally calculated
+sha256  c3feb896a1b42595cf9a508ed64ed0dc3cd84fffdb8eed790d02d0534ab322ce  gemmlowp-16e8662c34917be0065110bfcd9cc27d30f52fdf.tar.gz
+# License files, locally calculated
+sha256  cfc7749b96f63bd31c3c42b5c471bf756814053e847c10f3eb003417bc523d30  LICENSE

package/gemmlowp/gemmlowp.mk

@@ -0,0 +1,16 @@
+################################################################################
+#
+# gemmlowp
+#
+################################################################################
+
+GEMMLOWP_VERSION = 16e8662c34917be0065110bfcd9cc27d30f52fdf
+GEMMLOWP_SITE = $(call github,google,gemmlowp,$(GEMMLOWP_VERSION))
+GEMMLOWP_LICENSE = Apache-2.0
+GEMMLOWP_LICENSE_FILES = LICENSE
+GEMMLOWP_INSTALL_STAGING = YES
+# Only installs a header
+GEMMLOWP_INSTALL_TARGET = NO
+GEMMLOWP_SUBDIR = contrib
+
+$(eval $(cmake-package))