linux/scripts/Makefile.build, branch v4.6

objtool: Detect and warn if libelf is missing and don't break the build

2016-03-05T08:20:44Z

With CONFIG_STACK_VALIDATION enabled, if the host system doesn't have a development version of libelf installed, the build fails with errors like: elf.h:22:18: fatal error: gelf.h: No such file or directory compilation terminated. Instead of failing to build, instead just print a warning and disable stack validation. Signed-off-by: Josh Poimboeuf Cc: Andrew Morton Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Stephen Rothwell Cc: Sudip Mukherjee Cc: Thomas Gleixner Cc: linux-next@vger.kernel.org Cc: linux@roeck-us.net Cc: live-patching@vger.kernel.org Link: http://lkml.kernel.org/r/8c27fe00face60f42e888ddb3142c97e45223165.1457026550.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar

objtool: Add CONFIG_STACK_VALIDATION option

2016-02-29T07:35:13Z

Add a CONFIG_STACK_VALIDATION option which will run "objtool check" for each .o file to ensure the validity of its stack metadata. Signed-off-by: Josh Poimboeuf Cc: Andrew Morton Cc: Andy Lutomirski Cc: Arnaldo Carvalho de Melo Cc: Bernd Petrovitsch Cc: Borislav Petkov Cc: Chris J Arges Cc: Jiri Slaby Cc: Linus Torvalds Cc: Michal Marek Cc: Namhyung Kim Cc: Pedro Alves Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: live-patching@vger.kernel.org Link: http://lkml.kernel.org/r/92baab69a6bf9bc7043af0bfca9fb964a1d45546.1456719558.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar

kbuild: Allow to specify composite modules with modname-m

2015-11-25T10:23:25Z

This allows to write drm-$(CONFIG_AGP) += drm_agpsupport.o without having to handle CONFIG_AGP=y vs. CONFIG_AGP=m. Only support this syntax for modules, since built-in code depending on something modular cannot work and init/Makefile actually relies on the current semantics. There are a few drivers which adapted to the current semantics out of necessity; these are fixed to also work when the respective subsystem is modular. Acked-by: Peter Chen [chipidea] Signed-off-by: Michal Marek

ftrace: allow architectures to specify ftrace compile options

2015-01-29T08:19:19Z

If the kernel is compiled with function tracer support the -pg compile option is passed to gcc to generate extra code into the prologue of each function. This patch replaces the "open-coded" -pg compile flag with a CC_FLAGS_FTRACE makefile variable which architectures can override if a different option should be used for code generation. Acked-by: Steven Rostedt Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

kbuild: remove obj-n and lib-n handling

2014-10-02T11:55:02Z

Kconfig never defines CONFIG_* as 'n'. Now obj-n is only used in firmware/Makefile and it can be replaced with obj-. No makefile uses lib-n. Let's rip off obj-n and lib-n. Signed-off-by: Masahiro Yamada Acked-by: Peter Foley Signed-off-by: Michal Marek

kbuild: handle multi-objs dependency appropriately

2014-08-19T08:26:19Z

The comment in scripts/Makefile.build says as follows: We would rather have a list of rules like foo.o: $(foo-objs) but that's not so easy, so we rather make all composite objects depend on the set of all their parts This commit makes it possible! For example, assume a Makefile like this obj-m = foo.o bar.o foo-objs := foo1.o foo2.o bar-objs := bar1.o bar2.o Without this patch, foo.o depends on all of foo1.o foo2.o bar1.o bar2.o. It looks funny that foo.o is regenerated when bar1.c is updated. Now we can handle the dependency of foo.o and bar.o separately. Signed-off-by: Masahiro Yamada Signed-off-by: Michal Marek

kbuild: trivial - remove trailing spaces

2014-04-30T15:34:32Z

Signed-off-by: Masahiro Yamada Signed-off-by: Michal Marek

kbuild: move extra gcc checks to scripts/Makefile.extrawarn

2014-04-16T21:28:41Z

W=... provides extra gcc checks. Having such code in scripts/Makefile.build results in the same flags being added to KBUILD_CFLAGS multiple times becuase scripts/Makefile.build is invoked every time Kbuild descends into the subdirectories. Since the top Makefile is already too cluttered, this commit moves all of extra gcc check stuff to a new file scripts/Makefile.extrawarn, which is included from the top Makefile. Signed-off-by: Masahiro Yamada CC: Sam Ravnborg Signed-off-by: Michal Marek

kbuild: LLVMLinux: Adapt warnings for compilation with clang

2014-04-09T20:44:34Z

When compiling kernel with clang, disable warnings which are too noisy, and add the clang flag catch-undefined-behavior. Signed-off-by: Jan-Simon Möller Signed-off-by: Behan Webster Signed-off-by: Mark Charlebois Cc: PaX Team

Kbuild, lto: Disable LTO for asm-offsets.c

2014-02-14T04:25:03Z

The asm-offset.c technique to fish data out of the assembler file does not work with LTO. Just disable for the asm-offset.c build. Signed-off-by: Andi Kleen Link: http://lkml.kernel.org/r/1391846481-31491-11-git-send-email-ak@linux.intel.com Signed-off-by: H. Peter Anvin