Bug#841594: libc++: FTBFS: ../../libcxx/include/string:1938:44: error: 'basic_string<_CharT, _Traits, _Allocator>' is missing exception specification 'noexcept(is_nothrow_copy_constructible<allocator_type>::value)'

[Lucas Nussbaum]

Source: libc++
Version: 3.7.0-1
Severity: serious
Tags: stretch sid
User: debian-qa at lists.debian.org
Usertags: qa-ftbfs-20161021 qa-ftbfs
Justification: FTBFS on amd64

Hi,

During a rebuild of all packages in sid, your package failed to build on
amd64.

Relevant part (hopefully):
> make[1]: Entering directory '/build/libc++-sGGHpB/libc++-3.7.0'
> cd libcxxabi/lib && \
> 	rm -f libc++abi.so libc++abi.so.1 && \
> 	./buildit && \
> 	ln -s libc++abi.so.1.0 libc++abi.so && \
> 	ln -s libc++abi.so.1.0 libc++abi.so.1
> + clang++ -c -g -O3 -fPIC -std=c++11 -stdlib=libc++ -fstrict-aliasing -Wstrict-aliasing=2 -Wsign-conversion -Wshadow -Wconversion -Wunused-variable -Wmissing-field-initializers -Wchar-subscripts -Wmismatched-tags -Wmissing-braces -Wshorten-64-to-32 -Wsign-compare -Wstrict-aliasing=2 -Wstrict-overflow=4 -Wunused-parameter -Wnewline-eof -I../include -I../../libcxx/include ../src/abort_message.cpp
> + clang++ -c -g -O3 -fPIC -std=c++11 -stdlib=libc++ -fstrict-aliasing -Wstrict-aliasing=2 -Wsign-conversion -Wshadow -Wconversion -Wunused-variable -Wmissing-field-initializers -Wchar-subscripts -Wmismatched-tags -Wmissing-braces -Wshorten-64-to-32 -Wsign-compare -Wstrict-aliasing=2 -Wstrict-overflow=4 -Wunused-parameter -Wnewline-eof -I../include -I../../libcxx/include ../src/cxa_aux_runtime.cpp
> + clang++ -c -g -O3 -fPIC -std=c++11 -stdlib=libc++ -fstrict-aliasing -Wstrict-aliasing=2 -Wsign-conversion -Wshadow -Wconversion -Wunused-variable -Wmissing-field-initializers -Wchar-subscripts -Wmismatched-tags -Wmissing-braces -Wshorten-64-to-32 -Wsign-compare -Wstrict-aliasing=2 -Wstrict-overflow=4 -Wunused-parameter -Wnewline-eof -I../include -I../../libcxx/include ../src/cxa_default_handlers.cpp
> + clang++ -c -g -O3 -fPIC -std=c++11 -stdlib=libc++ -fstrict-aliasing -Wstrict-aliasing=2 -Wsign-conversion -Wshadow -Wconversion -Wunused-variable -Wmissing-field-initializers -Wchar-subscripts -Wmismatched-tags -Wmissing-braces -Wshorten-64-to-32 -Wsign-compare -Wstrict-aliasing=2 -Wstrict-overflow=4 -Wunused-parameter -Wnewline-eof -I../include -I../../libcxx/include ../src/cxa_demangle.cpp
> In file included from ../src/cxa_demangle.cpp:15:
> ../../libcxx/include/string:1938:44: error: 'basic_string<_CharT, _Traits, _Allocator>' is missing exception specification 'noexcept(is_nothrow_copy_constructible<allocator_type>::value)'
> basic_string<_CharT, _Traits, _Allocator>::basic_string(const allocator_type& __a)
>                                            ^
> ../../libcxx/include/string:1326:40: note: previous declaration is here
>     _LIBCPP_INLINE_VISIBILITY explicit basic_string(const allocator_type& __a)
>                                        ^
> 1 error generated.
> debian/rules:19: recipe for target 'override_dh_auto_build' failed
> make[1]: *** [override_dh_auto_build] Error 1

If the failure looks somehow time/timezone related:
Note that this rebuild was performed without the 'tzdata' package
installed in the chroot. tzdata used be (transitively) part of
build-essential, but it no longer is. If this package requires it to
build, it should be added to build-depends. For the release team's
opinion on this, see
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=836940#185

If the failure looks LSB-related:
similarly to tzdata, lsb-base is not installed in the build chroot.

The full build log is available from:
   http://aws-logs.debian.net/2016/10/21/libc++_3.7.0-1_unstable.log

A list of current common problems and possible solutions is available at
http://wiki.debian.org/qa.debian.org/FTBFS . You're welcome to contribute!

About the archive rebuild: The rebuild was done on EC2 VM instances from
Amazon Web Services, using a clean, minimal and up-to-date chroot. Every
failed build was retried once to eliminate random failures.