http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59436
--- Comment #13 from Dominique d'Humieres <dominiq at lps dot ens.fr> --- Also seen on x86_64-apple-darwin13 at r206072 (only once). Note that on x86_64-apple-darwin13 I see random PCH failures when I do the check with -j8, e.g.: WARNING: program timed out. FAIL: gcc.dg/pch/save-temps-1.c -O0 -g -I. -Dwith_PCH (test for excess errors) FAIL: gcc.dg/pch/save-temps-1.c -O0 -g assembly comparison FAIL: gcc.dg/pch/save-temps-1.c -O0 -I. -Dwith_PCH (internal compiler error) FAIL: gcc.dg/pch/save-temps-1.c -O0 -I. -Dwith_PCH (test for excess errors) FAIL: gcc.dg/pch/save-temps-1.c -O0 assembly comparison WARNING: program timed out. FAIL: g++.dg/pch/pch.C -O2 -g -I. -Dwith_PCH (test for excess errors) FAIL: g++.dg/pch/pch.C -O2 -g assembly comparison WARNING: program timed out. FAIL: g++.dg/pch/pch.C -O2 -I. -Dwith_PCH (test for excess errors) FAIL: g++.dg/pch/pch.C -O2 assembly comparison FAIL: g++.dg/pch/pch.C -g -I. -Dwith_PCH (internal compiler error) FAIL: g++.dg/pch/pch.C -g -I. -Dwith_PCH (test for excess errors) FAIL: g++.dg/pch/pch.C -g assembly comparison Could it be related to this PR?