id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
11526	mbtowc and wctomb are not implemented on Android	jeff.diclemente@…	Robert Ramey	"A runtime error occurs when using the Boost serialization library on Android. The symbols ""mbtowc"" and ""mctomb"" cannot be found by the linker. 
This occurs because the GNU C++ library provided by the Android NDK does not implement mbtowc and wctomb.

A working example which demonstrates this error is attached. It is taken verbatim from the boost serialization example (i.e. boost/libs/serialization/examples/demo_xml.cpp). 
It can only be run on an Android device.

The example program was built using the following:
arm-linux-androideabi-g++ demo_xml.cpp -Iboost/include -std=c++11 -Lboost/lib -lboost_wserialization -lboost_serialization

The example program was built using a standalone GCC 4.8.0 ARM-v7a toolchain built from Android NDK r9 using boost 1.49.0. 
The issue still exists in the latest boost code in GitHub and with the latest Android NDK r10e (i.e. the C++ Library in Android NDK r10e was examined and ""mbtowc"" and ""wctomb"" still don't exist).

To reproduce, build a standalone GCC toolchain for ARM-v7a by following the instructions here: https://developer.android.com/ndk/guides/standalone_toolchain.html and then build ./boost/libs/serialization/examples/demo_xml.cpp.


I have a proposed fix for this which uses mbrtowc and wcrtomb, which are supported by the Android C++ library. I plan to submit a GitHub pull request.
"	Feature Requests	closed	To Be Determined	serialization	Boost Development Trunk	Problem	fixed	Android