When I change something in the kernel and just hit make from toplevel dir, it always compiles everything again, no matter if it wasn't changed at all in the meantime. I thought make should be able to make a second build time really quick. What am I doing wrong? Is there a make target I don't know of? I don't type in any, just make.
Are you sure it rebuilds _everything_, i.e. as in a fresh build or after a "make clean?" When I rerun make without changing anything, it just does the following, which is much Less than a complete build: $ make make -C /root/views/DCUOS_3/derived/tdc/kernel O=/root/views/DCUOS_3/derived/tdc/kernelObjects/. Using /root/views/DCUOS_3/derived/tdc/kernel as source for kernel GEN /root/views/DCUOS_3/derived/tdc/kernelObjects/Makefile CHK include/linux/version.h CHK include/linux/utsrelease.h SYMLINK include/asm -> include/asm-x86 CALL /root/views/DCUOS_3/derived/tdc/kernel/scripts/checksyscalls.sh CHK include/linux/compile.h VDSOSYM arch/x86/vdso/vdso32-int80-syms.lds VDSOSYM arch/x86/vdso/vdso32-sysenter-syms.lds VDSOSYM arch/x86/vdso/vdso32-syms.lds LD arch/x86/vdso/built-in.o LD arch/x86/built-in.o LD vmlinux.o MODPOST vmlinux.o GEN .version CHK include/linux/compile.h UPD include/linux/compile.h CC init/version.o LD init/built-in.o LD .tmp_vmlinux1 KSYM .tmp_kallsyms1.S AS .tmp_kallsyms1.o LD .tmp_vmlinux2 KSYM .tmp_kallsyms2.S AS .tmp_kallsyms2.o LD vmlinux SYSMAP System.map SYSMAP .tmp_System.map VOFFSET arch/x86/boot/voffset.h OBJCOPY arch/x86/boot/compressed/vmlinux.bin GZIP arch/x86/boot/compressed/vmlinux.bin.gz MKPIGGY arch/x86/boot/compressed/piggy.S AS arch/x86/boot/compressed/piggy.o LD arch/x86/boot/compressed/vmlinux ZOFFSET arch/x86/boot/zoffset.h AS arch/x86/boot/header.o CC arch/x86/boot/version.o LD arch/x86/boot/setup.elf OBJCOPY arch/x86/boot/setup.bin OBJCOPY arch/x86/boot/vmlinux.bin BUILD arch/x86/boot/bzImage Root device is (8, 5) Setup is 11148 bytes (padded to 11264 bytes). System is 1759 kB CRC f583db84 Kernel: arch/x86/boot/bzImage is ready (#3) Building modules, stage 2. MODPOST 1 modules