It would be really great if the standard releng builds used read-only source trees, but this takes read-only source trees and an update build to reproduce. The root cause is the use of cp as a build tool, because it preserves permissions from source to obj, combined with not using cp -f. Really there should be some program that acts like a compiler/assembler and creates fresh files, perhaps "cat" :-)
~/NetBSD-6/src/external/gpl3/gcc/usr.bin/include > /usr/obj/gdt-6/tools/bin/nbmake-i386 includes cp /u0/n0/gdt/NetBSD-6/src/external/gpl3/gcc/dist/gcc/config/i386/pmm_malloc.h mm_malloc.h cp: mm_malloc.h: Permission denied *** Failed target: mm_malloc.h *** Failed command: cp /u0/n0/gdt/NetBSD-6/src/external/gpl3/gcc/dist/gcc/config/i386/pmm_malloc.h mm_malloc.h *** Error code 1 Stop. nbmake: stopped in /u0/n0/gdt/NetBSD-6/src/external/gpl3/gcc/usr.bin/include
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