Error compiling libboost_thread for android

[Radke]

System configuration: Ubuntu 12.04, android-ndk-r8e, Android 4.0.3 level 15 on device, gcc android4.6 (but this also applies to Windows 7 with minGw)

Setup: Most parts of boost build as expected, after invoking

./bootstrap.sh --with-libraries=thread,signals,serialization,test,regex,system,date_time,exception,filesystem,math

./bjam --without-python --without-serialization toolset=gcc-android4.6 link=static runtime-link=static target-os=linux --stagedir=android --prefix=$MYDIR install

Expected behaviour: After this compilation there should be a libboost_thread.a binary in the specified prefix.

Observed behaviour: When compiling, the gcc fails with

./boost/functional/hash/extensions.hpp:257:34: error: no matching function for call to 'hash_value(wchar_t const&'

Comment: I will attach the whole log of a compile --with-thread to this report, as well as my user-config.jam.

[Radke]

The whole output of the bjam call

[Radke]

The necessary content of the user-config.jam file

[Radke]

Replying to anonymous: Is now tested for boost 1_53_0 too with the same results

[anonymous]

Not sure what I can do much for a four year old android bug report. I'm not seeing this in the regression test results for android with recent versions.

My guess is that in config BOOST_NO_STD_WSTRING was not defined, but BOOST_NO_INTRINSIC_WCHAR_T was defined, meaning that the code thinks there is a std::wstring, but no wchar_t. That results in hash defining a hash function for std::wstring, but it fails to compile because it can't hash the characters. I'll put in a change to only define a hash function for std::wstring when wchar_t is available, but I'm not sure if it'll do any good.

I suppose another possibility would be to write special case code for strings so that it doesn't need a hash function for characters, but I'd rather not do that, as I don't want to add new functionality at this point.

[Daniel James]

Change at:

​https://github.com/boostorg/functional/commit/f230731aa53ba8b30b77e56f28bfcf5317b12dc6