Bug#823058: libc++: FTBFS on armel: cannot compile this atomic library call yet

[Andreas Beckmann]

Source: libc++
Version: 3.7.0-1
Severity: serious
Justification: fails to build from source

Hi,

libc++ FTBFS on armel:

https://buildd.debian.org/status/fetch.php?pkg=libc%2B%2B&arch=armel&ver=3.7.0-1&stamp=1458134892

[...]
+ clang++ -c -g -Os -fPIC -nostdinc++ -std=c++11 -fstrict-aliasing -Wall -Wextra -Wshadow -Wconversion -Wpadded -Wstrict-aliasing=2 -Wstrict-overflow=4 -DLIBCXXABI -I../include -I../../libcxxabi/include ../src/memory.cpp
In file included from ../src/memory.cpp:16:
../src/support/atomic_support.h:73:12: error: cannot compile this atomic library call yet
    return __atomic_add_fetch(__val, __a, __order);
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
debian/rules:19: recipe for target 'override_dh_auto_build' failed


Andreas