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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/$(SRCARCH)/include/generated/. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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6
Makefile
6
Makefile
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@ -1091,7 +1091,9 @@ PHONY += prepare archprepare prepare1 prepare3
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prepare3: include/config/kernel.release
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ifneq ($(srctree),.)
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@$(kecho) ' Using $(srctree) as source for kernel'
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$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
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$(Q)if [ -f $(srctree)/.config -o \
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-d $(srctree)/include/config -o \
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-d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
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echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
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echo >&2 " in the '$(srctree)' directory.";\
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/bin/false; \
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@ -1350,7 +1352,7 @@ CLEAN_DIRS += $(MODVERDIR) include/ksym
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# Directories & files removed with 'make mrproper'
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MRPROPER_DIRS += include/config usr/include include/generated \
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arch/*/include/generated .tmp_objdiff
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arch/$(SRCARCH)/include/generated .tmp_objdiff
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MRPROPER_FILES += .config .config.old .version \
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Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
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signing_key.pem signing_key.priv signing_key.x509 \
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