id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
230	toolset=clang: 'address-model' uses wrong option	Md Abdur Rahim	somebody	"When compiling with the following command:

{{{
./b2 -d+2 -a toolset=clang cxxflags=""-std=c++11 -stdlib=libc++"" linkflags=""-stdlib=libc++"" architecture=x86 address-model=32 macosx-version=10.7
}}}

the 'address-model' parameter creates the option '-march' for clang, but this does not work the same as gcc (produces the message ""error: unknown target CPU 'i386'"").

Upon investigating which option Xcode uses when compiling for different address models, I see it uses the '-arch' option instead. Indeed, the following build command creates i386 static binaries in OS X.

{{{
./b2 -d+2 -a toolset=clang cxxflags=""-std=c++11 -stdlib=libc++ -arch i386"" linkflags=""-stdlib=libc++ -arch i386"" architecture=x86 macosx-version=10.7
}}}

I am not sure if this is a boost build problem or clang problem (if the latter, please let me know and I will report the bug to the clang guys).  I also brought this up on the mailing list here: [http://lists.boost.org/boost-build/2012/07/26152.php]."	defect	new	major		component1	2.0