bug#26638: 25.2; Fatal error 6: Abortmake[1]: *** [Makefile:737: bootstrap-emacs] Abort (core dumped)

[Paul Eggert]

For what it's worth I could not reproduce the problem on i386-pc-solaris2.11 
with Sun C 5.12. Emacs did not crash at all.

My guess is that it's a bug in how unexec works in your environment. It's also 
possible that it's a bug in your C compiler, though I think this less likely. 
Unfortunately, it is hard to debug this sort of thing without access to the 
failing system.

Is it easy for you to try the latest C compiler from Oracle instead? The current 
stable version is Sun C 5.14 (Oracle Developer Studio 12.5), which you can get here:

https://www.oracle.com/tools/developerstudio/index.html