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| author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2019-04-07 19:43:51 +0900 |
|---|---|---|
| committer | Masahiro Yamada <yamada.masahiro@socionext.com> | 2019-04-09 22:51:56 +0900 |
| commit | a788b2ed81abeb949325fd50d7527f45203c1b21 (patch) | |
| tree | f20f94a39e6906f3f26443fc5f3deca417be89ee /Makefile | |
| parent | 24512795df0901f79a670f8285c450ae912c009d (diff) | |
| download | lwn-a788b2ed81abeb949325fd50d7527f45203c1b21.tar.gz lwn-a788b2ed81abeb949325fd50d7527f45203c1b21.zip | |
kbuild: check arch/$(SRCARCH)/include/generated before out-of-tree build
After cross-compiling the kernel, "make mrproper" should be executed
with the proper ARCH= option. Otherwise, stale objects will remain
under arch/$(SRCARCH)/.
One bad scenario is like this:
$ make ARCH=arm defconfig all # cross-compile the kernel for arm
$ make mrproper # mrproper for host-arch (i.e. x86)
$ make ARCH=arm O=build_dir defconfig all
If you miss ARCH= for mrproper and cross-compile the kernel with O=
and ARCH= options, Kbuild will happily start to build, but may fail
due to stale objects in the srctree.
If $(srctree)/arch/$(SRCARCH)/include/generated/ exists, let's stop
the out-of-tree build. To detect this, mrproper should clean only
arch/$(SRCARCH)/include/generated/.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 6 |
1 files changed, 4 insertions, 2 deletions
@@ -1091,7 +1091,9 @@ PHONY += prepare archprepare prepare1 prepare3 prepare3: include/config/kernel.release ifneq ($(srctree),.) @$(kecho) ' Using $(srctree) as source for kernel' - $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ + $(Q)if [ -f $(srctree)/.config -o \ + -d $(srctree)/include/config -o \ + -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ echo >&2 " in the '$(srctree)' directory.";\ /bin/false; \ @@ -1350,7 +1352,7 @@ CLEAN_DIRS += $(MODVERDIR) include/ksym # Directories & files removed with 'make mrproper' MRPROPER_DIRS += include/config usr/include include/generated \ - arch/*/include/generated .tmp_objdiff + arch/$(SRCARCH)/include/generated .tmp_objdiff MRPROPER_FILES += .config .config.old .version \ Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ signing_key.pem signing_key.priv signing_key.x509 \ |