package/utfcpp: new package

Needed for taglib 2.x:
https://github.com/taglib/taglib/commit/6ed0ca28db0d12a75572c0f5dcefdc5ebb34cc21

Upstream discourages the use of CMakeList.txt to install the package:
https://github.com/nemtrif/utfcpp/commit/4965d378fb141a21c8afa7c283a8af4725e6a57e

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

DEVELOPERS

@@ -509,6 +509,7 @@ F:	package/tor/
 F:	package/transmission/
 F:	package/tvheadend/
 F:	package/unixodbc/
+F:	package/utfcpp/
 F:	package/vlc/
 F:	package/wget/
 F:	package/wireless-regdb/

package/Config.in

@@ -2364,6 +2364,7 @@ menu "Text and terminal handling"
 	source "package/tclap/Config.in"
 	source "package/termcolor/Config.in"
 	source "package/utf8proc/Config.in"
+	source "package/utfcpp/Config.in"
 endmenu
 
 endmenu

package/utfcpp/Config.in

@@ -0,0 +1,10 @@
+config BR2_PACKAGE_UTFCPP
+	bool "utfcpp"
+	depends on BR2_INSTALL_LIBSTDCPP
+	help
+	  UTF-8 with C++ in a Portable Way
+
+	  https://github.com/nemtrif/utfcpp
+
+comment "taglib needs a toolchain w/ C++"
+	depends on !BR2_INSTALL_LIBSTDCPP

package/utfcpp/utfcpp.hash

@@ -0,0 +1,3 @@
+# Locally calculated
+sha256  6920a6a5d6a04b9a89b2a89af7132f8acefd46e0c2a7b190350539e9213816c0  utfcpp-4.0.6.tar.gz
+sha256  c9bff75738922193e67fa726fa225535870d2aa1059f91452c411736284ad566  LICENSE

package/utfcpp/utfcpp.mk

@@ -0,0 +1,23 @@
+################################################################################
+#
+# taglib
+#
+################################################################################
+
+UTFCPP_VERSION = 4.0.6
+UTFCPP_SITE = $(call github,nemtrif,utfcpp,v$(UTFCPP_VERSION))
+UTFCPP_LICENSE = BSL-1.0
+UTFCPP_LICENSE_FILES = LICENSE
+
+# utfcpp is a header-only library, it only makes sense
+# to have it installed into the staging directory.
+UTFCPP_INSTALL_STAGING = YES
+UTFCPP_INSTALL_TARGET = NO
+
+define UTFCPP_INSTALL_STAGING_CMDS
+	mkdir -p $(STAGING_DIR)/usr/include/utf8/
+	$(INSTALL) -m 0644 $(@D)/source/utf8.h $(STAGING_DIR)/usr/include/utf8.h
+	$(INSTALL) -m 0644 $(@D)/source/utf8/* $(STAGING_DIR)/usr/include/utf8/
+endef
+
+$(eval $(generic-package))