On 07/06/2015 06:01 PM, Yuxin Ren wrote: > I use Ubuntu. Year I also can find unwind.h on my system. > But I cannot find it in the gcc source code (cloned from the gcc github). > Where is unwind.h in the gcc source code? > And if it doesn't have such file, how it can be correctly compiled? As it was already mentioned, unwind.h is selected from one of unwind-*.h files in libgcc. You should probably take a look at libgcc/configure.ac and other autoconf scripts which get included from it. -- Regards, Mikhail Maltsev