On 04.07.2013 11:13, David kiarie wrote:
On Thu, Jul 4, 2013 at 9:53 AM, Warlich, Christof <christof.warlich@siemens.com <mailto:christof.warlich@siemens.com>> wrote:
> 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/bzImag 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 _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org <mailto:Kernelnewbies@kernelnewbies.org> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Am also pretty sure it does not compile everything.
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indeed it doesn't compile everything but a lot (or all?) modules for example. A build with very little changes lasts more than half the time a fresh clean build lasts. But I don't seem to do anything wrong then, just wanted to check if I can do something about it. thanks!! martin