Confirming the work of others (pdimov and degski et al), I am now getting good results using clang-win (Clang 8.0.0 rc using GCC provided by Mingw64) on Windows 10. (Clang 8.0.0 should be finally released very soon now). Working the develop branch (fully up-to-date), I can run the Boost.Math examples and tests, and build the a set of most libraries (4 versions of most, for example) 27-Feb-19 14:32 15,872 boost_atomic-clangw8-mt-d-x64-1_70.dll 27-Feb-19 14:32 2,442 boost_atomic-clangw8-mt-d-x64-1_70.lib 27-Feb-19 14:32 9,728 boost_atomic-clangw8-mt-x64-1_70.dll 27-Feb-19 14:32 2,420 boost_atomic-clangw8-mt-x64-1_70.lib (but there are some failures to compile or to link). Examples in Addendum below: My user-config.jam contains using clang-win : # Clang Version. 8.0.0 : # Location of Clang compiler .exe file(s). Must use clang-cl driver, not clang++.exe # Copied path is "C:\LLVM\clang-700\LLVM\bin\clang-cl.exe" "C:/LLVM/clang-800/LLVM/bin/clang-cl.exe" -fuse-ld=lld # Use lld linker https://lld.llvm.org/, not clang++. # : # Options. <cxxflags>-v # Verbose output for testing only. ? --verbose does not work for clang? # <define>BOOST_CONFIG_SUPPRESS_OUTDATED_MESSAGE # <compileflags>-m64 Use address-model=64 on command line. <compatibility>vc14 # MS version compatibility. <cxxflags>-fmsc-version=1915 <cxxflags>-fms-compatibility <cxxflags>-fno-delayed-template-parsing #https://clang.llvm.org/docs/CommandGuide/clang.html#cmdoption-s # options are -flto, -flto=full, -flto=thin, -emit-llvm # Generate output files in LLVM formats, suitable for link time optimization. # The default for -flto is "full", in which the LLVM bitcode is suitable for monolithic Link Time Optimization (LTO), # where the linker merges all such modules into a single combined module for optimization. # With "thin", ThinLTO compilation is invoked instead. <cxxflags>-flto=thin # MS clang-cl compatibility settings: <cxxflags>"/std:c++17" # Must be c++17, not earlier. <cxxflags>"/Zc:forScope" <cxxflags>"/Zc:wchar_t" <cxxflags>"/EHsc" # exception handling # https://docs.microsoft.com/en-us/cpp/build/reference/eh-exception-handling-m... # (/EHsc), catches C++ exceptions only and tells the compiler to assume that # functions declared as extern "C" never throw a C++ exception. <cxxflags>"/Zc:inline" <cxxflags>"/Gd" <cxxflags>"/diagnostics:classic" # Clang flags: # https://clang.llvm.org/docs/ClangCommandLineReference.html#compilation-flags # <cxxflags>-std=c++17 - already declared as a MS option. <cxxflags>-Wno-deprecated <cxxflags>-Wno-delete-non-virtual-dtor # <cxxflags>-fmacro-backtrace-limit=0 # <cxxflags>-Wno-invalid-token-paste <cxxflags>-Wno-language-extension-token <cxxflags>-Wno-microsoft-enum-value <cxxflags>-Wno-literal-range <cxxflags>-Wno-unknown-pragmas <cxxflags>-Wno-unused-variable <cxxflags>-Wno-microsoft-enum-value # <cxxflags>-Wno-invalid-constexpr # Need to stop reporting an error in Boost.System? <cxxflags>-Wno-unknown-argument <cxxflags>-Wno-unknown-pragmas <cxxflags>-Wno-macro-redefined <cxxflags>-Wno-unused-variable <cxxflags>-Wno-mismatched-tags <cxxflags>-Wno-deprecated-declarations <define>_CRT_SECURE_NO_DEPRECATE <define>_CRT_SECURE_NO_WARNINGS # Not all these may be needed to get a mostly warning-free build. ... My build command is \modular-boost>b2 -j4 toolset=clang-win-8.0.0 address-model=64 architecture=x86 --libdir=I:/modular-boost/lib --build-type=complete --without=mpi --without=python install 1>../boost_clang-win-8.0.0_64_config_27-Feb-19_1507.log I wonder if this means that it is time to add clang-win-8 configuration to the Boost Test summary at https://www.boost.org/development/tests/develop/developer/summary.html ? Paul PS What I have failed to get working is __float128 which works using GCC, but even after a patch enabling Clang in multiprecision's config and ensuring that quadmath.h is visible to the Clang compiler. It reports "not supported" :-( I have enquired if any progress can be made on making this work. Addendum - problem examples: ======================== LLVM ERROR: Associative COMDAT symbol '??_7codecvt_error_cat@?A0x15DB13AB@@6B@' does not exist. lld-link: error: undefined symbol: __imp_CryptGenRandom

...

...

referenced by I:\modular-boost\libs\random\src\random_device.cpp:121 lto.tmp:("public: unsigned int __cdecl boost::random::random_device::impl::next(void)" (?next@impl@random_device@random@boost@@QEAAIXZ)) clang-cl: error: linker command failed with exit code 1 (use -v to see invocation)

"C:/LLVM/clang-800/LLVM/bin/clang-cl.exe" "-fuse-ld=lld" -m64 /link /incremental:no /DLL /DEBUG /subsystem:console /out:"bin.v2\libs\random\build\clang-win-8.0.0\debug\address-model-64\threading-multi\boost_random-clangw8-mt-d-x64-1_70.dll" /IMPLIB:"bin.v2\libs\random\build\clang-win-8.0.0\debug\address-model-64\threading-multi\boost_random-clangw8-mt-d-x64-1_70.lib" @"bin.v2\libs\random\build\clang-win-8.0.0\debug\address-model-64\threading-multi\boost_random-clangw8-mt-d-x64-1_70.dll.rsp" if %ERRORLEVEL% NEQ 0 EXIT %ERRORLEVEL% and most annoyingly, since Boost.Test is a key library, "I:\modular-boost\lib\boost_unit_test_framework-clangw8-mt-d-x64-1_70.dll" "I:\modular-boost\lib\boost_unit_test_framework-clangw8-mt-d-x64-1_70.lib" but no release variants :-( clang-win.link.dll bin.v2\libs\test\build\clang-win-8.0.0\release\address-model-64\threading-multi\boost_unit_test_framework-clangw8-mt-x64-1_70.dll LLVM ERROR: Associative COMDAT symbol '??_7results_reporter_impl@?A0x22C2280D@results_reporter@unit_test@boost@@6B@' does not exist. clang-cl: error: linker command failed with exit code 1 (use -v to see invocation) "C:/LLVM/clang-800/LLVM/bin/clang-cl.exe" "-fuse-ld=lld" -m64 /link /incremental:no /DLL /subsystem:console /out:"bin.v2\libs\test\build\clang-win-8.0.0\release\address-model-64\threading-multi\boost_unit_test_framework-clangw8-mt-x64-1_70. dll" /IMPLIB:"bin.v2\libs\test\build\clang-win-8.0.0\release\address-model-64\threading-multi\boost_unit_test_framework-clangw8-mt-x64-1_ 70.lib" @"bin.v2\libs\test\build\clang-win-8.0.0\release\address-model-64\threading-multi\boost_unit_test_framework-clangw8-mt-x64-1_70.dll. rsp" if %ERRORLEVEL% NEQ 0 EXIT %ERRORLEVEL% ...failed clang-win.link.dll bin.v2\libs\test\build\clang-win-8.0.0\release\address-model-64\threading-multi\boost_unit_test_framework-clangw8-mt-x64-1_70.dll bin.v2\libs\test\build\clang-win-8.0.0\release\address-model-64\threading-multi\boost_unit_test_framework-clangw8-mt-x64-1_70.lib... --- Paul A. Bristow Prizet Farmhouse Kendal UK LA8 8AB +44 (0) 1539 561830