Description of problem: Afected build: http://koji.fedoraproject.org/koji/taskinfo?taskID=9190860 {standard input}: Assembler messages: {standard input}:99502: Warning: end of file not at end of a line; newline inserted {standard input}:100899: Error: expected comma after name `_ZN7mozilla3dom13Cont' in .size directive c++: internal compiler error: Killed (program cc1plus) Version-Release number of selected component (if applicable): 5.0.0-0.18.fc23
That error means the box doesn't have enough memory and kernel killed the compiler. This can be for many reasons, e.g. simultaneous memory hungry compilers, or even something else also taking memory. Only if gcc would consume inappropriate amounts of memory (compared to the complexity of the source that is being compiled) this could be considered a gcc bug.
Seems to be working now.