On 16.11.2012 14:40, Noam Camus wrote: > Hello Michael, > > Here is my patch for dealing with race between 2 jobs of primary Makefile: > > From 697f6ffa0d67b676fc2d75f65541c6e12108829d Mon Sep 17 00:00:00 2001 > From: Noam Camus <noamc@xxxxxxxxxx> > Date: Fri, 16 Nov 2012 15:12:48 +0200 > Subject: [PATCH] Makefile: solve race between make jobs. > > Fix occasionally compilation failures when source tree is distcleaned. > The compilation is failing over file scripts/mod/empty.c > > The error is because empty.o depends on some headers from: > arch/<arch>/include/generated/asm/ > > I see that there is a race between two targets in main Makefile (j=2): > 1) asm-generic > 2) scripts_basic > > asm-generic: > generates all wrappers in atch/<arch>/include/generated/asm/ > > scripts_basic: > calls scripts/Makefile.build > --> performs target __build > --> depends on targets defined at variable $(always) > --> compile scripts/mod/empty.c Can you explain this dependency? scripts/basic/fixdep.c is supposed to not depend on _anything_, because the script is subsequently used for any compilation. And scripts/mod/empty.c is only built when visiting scripts/mod: $ arch x86_64 $ mkdir /dev/shm/_build $ make O=/dev/shm/_build defconfig HOSTCC scripts/basic/fixdep ... # At this point, scripts_basic has already been done, but just for sure $ make O=/dev/shm/_build scripts_basic GEN /dev/shm/_build/Makefile scripts/kconfig/conf --silentoldconfig Kconfig # Yet $ ls /dev/shm/_build/scripts/mod ls: cannot access /dev/shm/_build/scripts/mod: No such file or directory If you are seeing something different, please tell which architecture and which configuration. Michal -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
