Bug#866354: armel: symbol _ZTINSt13__future_base12_Result_baseE, version GLIBCXX_3.4.15 not defined in file libstdc++.so.6

[Adrian Bunk]

Package: libstdc++6
Version: 7.1.0-7
Severity: serious
Control: affects -1 src:mesa

mesa FTBFS on armel due to:

https://buildd.debian.org/status/fetch.php?pkg=mesa&arch=armel&ver=17.1.3-2&stamp=1498610882&raw=0

...
llvm-config-4.0: relocation error: /usr/lib/llvm-4.0/bin/../lib/libLLVM-4.0.so.1: symbol _ZTINSt13__future_base12_Result_baseE, version GLIBCXX_3.4.15 not defined in file libstdc++.so.6 with link time reference
llvm-config-4.0: relocation error: /usr/lib/llvm-4.0/bin/../lib/libLLVM-4.0.so.1: symbol _ZTINSt13__future_base12_Result_baseE, version GLIBCXX_3.4.15 not defined in file libstdc++.so.6 with link time reference
llvm-config-4.0: relocation error: /usr/lib/llvm-4.0/bin/../lib/libLLVM-4.0.so.1: symbol _ZTINSt13__future_base12_Result_baseE, version GLIBCXX_3.4.15 not defined in file libstdc++.so.6 with link time reference
llvm-config-4.0: relocation error: /usr/lib/llvm-4.0/bin/../lib/libLLVM-4.0.so.1: symbol _ZTINSt13__future_base12_Result_baseE, version GLIBCXX_3.4.15 not defined in file libstdc++.so.6 with link time reference
...


My first guess would be that the #727621 fix might be missing
or broken in GCC 7.