lldb-6.0: error: thread-local storage is not supported for the current target

[dkbarto]

When this configuration is used the compile eventually throws an error about thread local variables not being supported. Which is true, the clang compiler than Apple shipped with 10.11 does not support thread local variables. For this reason that compiler should be black listed from the available compilers so a macports provided version of clang should be used. Most likely clang 5.0 or clang 6.0 at this time.

[mf2k (Frank Schima)]

In the future, please Cc the port maintainers (port info --maintainers lldb-6.0), if any.

[ryandesign (Ryan Carsten Schmidt)]

​Here is a log from the Yosemite buildbot worker showing the same issue:

[ 17%] Building CXX object tools/clang/lib/Basic/CMakeFiles/clangBasic.dir/SourceManager.cpp.o
cd /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_lang_llvm-6.0/lldb-6.0/work/build/tools/clang/lib/Basic && /usr/bin/clang++  -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_lang_llvm-6.0/lldb-6.0/work/build/tools/clang/lib/Basic -I/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_lang_llvm-6.0/lldb-6.0/work/llvm-6.0.1.src/tools/clang/lib/Basic -I/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_lang_llvm-6.0/lldb-6.0/work/llvm-6.0.1.src/tools/clang/include -I/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_lang_llvm-6.0/lldb-6.0/work/build/tools/clang/include -I/opt/local/include/libxml2 -I/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_lang_llvm-6.0/lldb-6.0/work/build/include -I/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_lang_llvm-6.0/lldb-6.0/work/llvm-6.0.1.src/include  -pipe -Os -std=c++11 -stdlib=libc++ -fPIC -fvisibility-inlines-hidden -Werror=date-time -std=c++11 -Wall -W -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wcovered-switch-default -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wstring-conversion -fno-common -Woverloaded-virtual -Wno-nested-anon-types -DNDEBUG -arch x86_64 -mmacosx-version-min=10.10    -fno-exceptions -o CMakeFiles/clangBasic.dir/SourceManager.cpp.o -c /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_lang_llvm-6.0/lldb-6.0/work/llvm-6.0.1.src/tools/clang/lib/Basic/SourceManager.cpp
/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_lang_llvm-6.0/lldb-6.0/work/llvm-6.0.1.src/tools/lldb/source/Utility/Timer.cpp:39:10: error: thread-local storage is not supported for the current target
  static thread_local TimerStack g_stack;
         ^

IIRC Apple Clang didn't add support for thread-local storage until version 800, so earlier versions should be blacklisted.

[kencu (Ken)]

In 2071c79f088d70040eafdf34546e461473af7072/macports-ports (master):

lldb 5.0 to devel: tweak failing systems

to match results on buildbot from recent revbumps
add known_fail to prevent needless build attempts

note: some of these older systems might build lldb with effort
the missing pieces might be replaced by legacysupport

closes: #57499
closes: #59326
closes: #59327
closes: #55720