Package: gcc-6-arm-linux-gnueabi Version: 6.3.0-18cross1 This is not specific to cross-compiling and not even to gcc-6.
We noticed the infinite loop when the buildd tries to build rnahybrid: https://buildd.debian.org/status/logs.php?pkg=rnahybrid&arch=armel It seems to be easy to reproduce with the cross-compiler. On Debian amd64 Stretch: sudo apt-get install gcc-6-arm-linux-gnueabi apt-get source rnahybrid cd rnahybrid-2.1.2/ export CC=arm-linux-gnueabi-gcc-6 ./configure --host=xx make # cc1 runs forever with 100% CPU, not much memory, compiling "energy.c" There's a warning about undefined behaviour, and I've not looked at the source at all, but an infinite loop like this is presumably a GCC bug in any case (though perhaps not such a serious one if it only happens with code that invokes undefined behaviour).
