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## Requirements

If Boost.Context uses fcontext_t (the default) as its implementation, it must be built for the particular compiler(s) and CPU architecture(s) being targeted. Using fcontext_t, Boost.Context includes assembly code and, therefore, requires GNU as and GNU preprocessor for supported POSIX systems, MASM for Windows/x86 systems and ARMasm for Windows/arm systems.

| Note
MASM64 (ml64.exe) is a part of Microsoft's Windows Driver Kit.

| Important
Please note that `address-model=64` must be given to bjam command line on 64bit Windows for 64bit build; otherwise 32bit code will be generated.

| Important
For cross-compiling the lib you must specify certain additional properties at bjam command line: `target-os`, `abi`, `binary-format`, `architecture` and `address-model`.

| Important
Windows using fcontext_t: for safe SEH the property 'asmflags=\safeseh' must be specified at bjam command line.

| Important
Windows using fcontext_t: turn off global program optimization (/GL) and change /EHsc (compiler assumes that functions declared as extern "C" never throw a C++ exception) to /EHs (tells compiler assumes that functions declared as extern "C" may throw an exception).

Because this library uses C++11 extensively, it requires a compatible compiler. Known minimum working versions are as follows: Microsoft Visual Studio 2015 (msvc-14.0), GCC 4.8 (with -std=c++11), Clang 3.4 (with -std=c++11). Other compilers may work, if they support the following language features: auto declarations, constexpr, defaulted functions, final, hdr thread, hdr tuple, lambdas, noexcept, nullptr, rvalue references, template aliases. thread local, variadic templates.