Fabrice Fontaine 288b517193 boost: context needs thread if gcc < 6 ... Commit f3a483a81b added -std=c++11 to boost build if context is selected and gcc is at least 4.7 however it has the side effect that cc-tool fails to find boost_system with the following error if context and system is enabled with a gcc greater than 6: configure:16312: /home/dawncrow/buildroot-test/scripts/instance-0/output/host/bin/x86_64-linux-g++ -o conftest -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -I/home/dawncrow/buildroot-test/scripts/instance-0/output/host/x86_64-buildroot-linux-musl/sysroot/usr/include -L/home/dawncrow/buildroot-test/scripts/instance-0/output/host/x86_64-buildroot-linux-musl/sysroot/usr/lib conftest.o -lboost_system -latomic >&5 conftest.o: In function `boost::system::error_category::std_category::equivalent(int, std::error_condition const&) const': conftest.cpp:(.text._ZNK5boost6system14error_category12std_category10equivalentEiRKSt15error_condition[_ZNK5boost6system14error_category12std_category10equivalentEiRKSt15error_condition]+0x37): undefined reference to `boost::system::detail::generic_category_instance' This error is related to the fact that since boost 1.68 and commit 7b6dcf6ac6, boost system headers are now C++14 "by default" with gcc above 6: - https://github.com/boostorg/system/issues/24 - https://github.com/boostorg/system/issues/26 - https://lists.boost.org/Archives/boost/2018/08/242770.php So when building with gcc > 6, cc-tool thinks that boost has generic_category_instance but because boost was compiled with std=c++11, this function will not be in the library causing a link error Instead of "hacking" even more boost, just remove -std=c++11 from boost.mk and select BOOST_THREAD with gcc lower than 6 Fixes: - http://autobuild.buildroot.org/results/fc8f8a64751c751b2b66301967cc008509bbaa70 Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com> Tested-by: Matt Weber <matthew.weber@rockwellcollins.com> Reviewed-by: Ferdinand van Aartsen <ferdinand@ombud.nl> Tested-by: Ferdinand van Aartsen <ferdinand@ombud.nl> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>		2018-10-26 17:09:51 +02:00
..
0001-fix-ambiguous-format-call-on-64bit-builds.patch
0002-fix-uclibc-eventfd.patch
0003-fenv.patch
0004-workaround-musl-bug.patch
0005-fix-static-detection-of-lock-free-atomic-ints.patch	boost: update upstream status of 0005-fix-static-detection-of-lock-free-atomic-ints.patch	2018-10-10 21:48:51 +02:00
boost.hash
boost.mk	boost: context needs thread if gcc < 6	2018-10-26 17:09:51 +02:00
Config.in	boost: context needs thread if gcc < 6	2018-10-26 17:09:51 +02:00