id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
12266,Visual Studio 2015 Express for Desktop and 64-bit builds,carles.cufi@…,,"When building Boost statically as a set of 64-bit static libraries, I have found that using the ""usual"" Command Prompt doesn't yield 64-bit objects, but rather 32-bit ones.

The build commands I am issuing are:

bootstrap.bat
b2 toolset=msvc-14.0 address-model=64 link=static --with-thread --with-system --with-regex --with-date_time --with-chrono

If I open a ""Developer Command Prompt"" (equivalent to executing %comspec% /k """"C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\Tools\VsDevCmd.bat"""") and then build with the commands above, the libraries generated are 32-bit.

If I open a ""standard"" command prompt (equivalent to %comspec% /k """"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat"""" x86)
and then build with the commands above, the libraries generated are 32-bit.

Finally, if I open a ""Visual Studio 2015 x86 x64 Cross Tools Command Prompt"" (equivalent to %comspec% /k """"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat"""" x86_amd64) and then build with the commands above, the libraries generated are 64-bit.

This is in my opinion a problem because of two reasons:

1) This contradicts the documentation in: 
http://www.boost.org/build/doc/html/bbv2/reference/tools.html#bbv2.reference.tools.compiler.msvc
where it says: ""Configure you compiler as usual. If you provide a path to the compiler explicitly, provide the path to the 32-bit compiler. If you try to specify the path to any of 64-bit compilers, configuration will not work.""
The usual configuration on Windows is the standard Developer Command Prompt.

2) The build doesn't fail or complain that it cannot generate 64-bit binaries, and instead silently disregards the ""address-model=64"" option and generates 32-bit binaries. 

Please note that with other tools (CMake for example) one can build both 32 and 64-bit binaries from a ""standard"" command prompt (i.e. no need to invoke vcvarsall.bat x86_amd64).




",Bugs,new,To Be Determined,Building Boost,Boost 1.61.0,Problem,,,