Am 27.03.2017 um 13:00 schrieb John Maddock via Boost:
Oh, and I forget to mention another observation: Why does the configuration summary state that Clang 3.8 does not support the "visibility" feature? I think that is just wrong.
The configuration summary for Clang 3.8 looks like the following. (Except for the "visibility" feature it is the same for GCC 4.8 and GCC 6.)
If you look in bin.v2/config.log you will see the error messages from the failed test - ie the reason it was disabled.
Thanks, John, that helped. Clang did not like my linker-input, because it was only trying to compile not link: ...updated 5 targets... ...found 6 targets... ...updating 5 targets... common.mkdir /home/jenkins/workspace/TEST_Boost_Build@3/clang38/build/boost/boost/bin.v2/libs/log/config/visibility common.mkdir /home/jenkins/workspace/TEST_Boost_Build@3/clang38/build/boost/boost/bin.v2/libs/log/config/visibility/clang-linux-3.8 common.mkdir /home/jenkins/workspace/TEST_Boost_Build@3/clang38/build/boost/boost/bin.v2/libs/log/config/visibility/clang-linux-3.8/debug common.mkdir /home/jenkins/workspace/TEST_Boost_Build@3/clang38/build/boost/boost/bin.v2/libs/log/config/visibility/clang-linux-3.8/debug/pch-off clang-linux.compile.c++.without-pth /home/jenkins/workspace/TEST_Boost_Build@3/clang38/build/boost/boost/bin.v2/libs/log/config/visibility/clang-linux-3.8/debug/pch-off/visibility.o clang: error: -lc++abi: 'linker' input unused clang: error: -lc++abi: 'linker' input unused "clang++" -c -x c++ -fvisibility=hidden -m64 -fpic -fdiagnostics-color=always -std=c++14 -stdlib=libc++ -isystem/usr/include/libcxxabi -lc++abi -O0 -Werror -g -m64 -fpic -fdiagnostics-color=always -fno-inline -Wall -pedantic -Werror -g -fPIC -m64 -fvisibility=hidden -m64 -fpic -fdiagnostics-color=always -std=c++14 -stdlib=libc++ -isystem/usr/include/libcxxabi -lc++abi -m64 -fpic -fdiagnostics-color=always -DBOOST_ALL_NO_LIB=1 -I"." -o "/home/jenkins/workspace/TEST_Boost_Build@3/clang38/build/boost/boost/bin.v2/libs/log/config/visibility/clang-linux-3.8/debug/pch-off/visibility.o" "libs/log/config/visibility/visibility.cpp" ...failed clang-linux.compile.c++.without-pth /home/jenkins/workspace/TEST_Boost_Build@3/clang38/build/boost/boost/bin.v2/libs/log/config/visibility/clang-linux-3.8/debug/pch-off/visibility.o... ...failed updating 1 target... It seems, I should not add a link-flag like "-lc++abi" to Boost.Build option "cxxflags!? Should I only use Boost.Build option "linkflags" or would I additionally have to prepend a "-Wl," to that link-flag? Thanks, Deniz
HTH, John.