fmt: new package

Signed-off-by: Semyon Kolganov <semenak94@mail.ru>
[Thomas:
 - add entry to DEVELOPERS file
 - add missing wchar dependency
 - minor tweaks.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/fmt/Config.in

@@ -0,0 +1,11 @@
+config BR2_PACKAGE_FMT
+	bool "fmt"
+	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_USE_WCHAR
+	help
+	  fmt is an open-source formatting library for C++. It can be used
+	  as a safe alternative to printf or as a fast alternative to
+	  IOStreams.
+
+comment "fmt needs a toolchain w/ C++, wchar"
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_USE_WCHAR

package/fmt/fmt.hash

@@ -0,0 +1,2 @@
+# Locally calculated
+sha256	dce62ab75a161dd4353a98364feb166d35e7eea382169d59d9ce842c49c55bad fmt-3.0.1.tar.gz

package/fmt/fmt.mk

@@ -0,0 +1,18 @@
+################################################################################
+#
+# fmt
+#
+################################################################################
+
+FMT_VERSION = 3.0.1
+FMT_SITE = $(call github,fmtlib,fmt,$(FMT_VERSION))
+FMT_LICENSE = BSD-2-Clause
+FMT_LICENSE_FILES = LICENSE.rst
+FMT_INSTALL_STAGING = YES
+
+FMT_CONF_OPTS = \
+	-DHAVE_OPEN=ON \
+	-DFMT_INSTALL=ON \
+	-DFMT_TEST=OFF
+
+$(eval $(cmake-package))