[Boost-bugs] [Boost C++ Libraries] #11526: mbtowc and wctomb are not implemented on Android

Subject: [Boost-bugs] [Boost C++ Libraries] #11526: mbtowc and wctomb are not implemented on Android
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2015-08-05 14:48:14

#11526: mbtowc and wctomb are not implemented on Android
-------------------------------------+---------------------------
 Reporter:  jeff.diclemente@…        |      Owner:  ramey
     Type:  Feature Requests         |     Status:  new
Milestone:  To Be Determined         |  Component:  serialization
  Version:  Boost Development Trunk  |   Severity:  Problem
 Keywords:  Android                  |
-------------------------------------+---------------------------
 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.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/11526>
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