Hi Jürgen, thanks for your answer. Am 20.01.2017 um 12:40 schrieb Jürgen Hunold:
Hi Deniz,
Am Freitag, 20. Januar 2017, 10:13:56 CET schrieb Deniz Bahadir:
Hi guys, I am able to build the Boost libraries using Clang and flags "-std=c++14 -stdlib=libc++", however, I noticed that several libraries are still linked against GCC's standard-library "libstdc++".
This works for me for quite a while. Please make sure you rebuild all libraries. Hint: b2 does not cache compiler flags. Add "-a" to your command line to force a full rebuild.
[...]
Most probably a not clean rebuild.
I built the libraries using our build-server which made sure to use an entirely new build- and source-directory. So that should not be the problem in my case.
dll-path==/opt/BENOCS/clang38/lib/x86_64-linux-gnu \ toolset=clang-3.8 \
The toolset "clang-3.8" is configured where and how?
I cannot really tell. At least it works. It uses the correct clang-executable.
cflags="$CFLAGS" CXXFLAGS="$CXXFLAGS" \
cxxflags="$CXXFLAGS"
Yes, you are right. However, that error just went in when writing this email. The build-server used the correct command.
linkflags="-Wl,--as-needed $LINK_LIBCXXABI"
I'd put the extra flags into user-/project-/site-config.jam.
I am not so fond of using these. I always get confused how they work, where they have to be located and to what project it applies. Especially, as our build-server builds boost with several compilers with (possibly) different settings.
For the environment-variable LINK_LIBCXXABI I tried "-lc++abi" as well and also tried providing it only in the cxxflags or the linkflags or both (as above).
linkflags should contain "-stdlib=libc++", too
I think, that did the trick. :-) It no longer links against "libstdc++".
[...]
PS: BTW, does anyone know if it is correct, that shared libraries (in general) that are linked against "libc++abi" do always also link to "libgcc_s"? (What is it for?)
The basic compiler runtime AFAIK. Might be replaced by clang's compiler-rt, I guess. But that is off-topic
Thanks for this additional insight.
Yours,
Jürgen
Thanks a lot, Deniz -- BENOCS GmbH Dipl.-Inform. Deniz Bahadir Winterfeldtstr. 21 10781 Berlin Germany Phone: +49 - 30 / 577 0004-22 Email: deniz.bahadir@benocs.com www.benocs.com Board of Management: Michael Wolz, Dr.-Ing. Oliver Holschke, Dr.-Ing. Ingmar Poese Commercial Register: Amtsgericht Bonn HRB 19378