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masahir0ytrini
masahir0y
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kbuild: change out-of-tree build
This commit changes the working directory where the build process occurs. Before this commit, build process occurred under the source tree for both in-tree and out-of-tree build. That's why we needed to add $(obj) prefix to all generated files in makefiles like follows: $(obj)u-boot.bin: $(obj)u-boot Here, $(obj) is empty for in-tree build, whereas it points to the output directory for out-of-tree build. And our old build system changes the current working directory with "make -C <sub-dir>" syntax when descending into the sub-directories. On the other hand, Kbuild uses a different idea to handle out-of-tree build and directory descending. The build process of Kbuild always occurs under the output tree. When "O=dir/to/store/output/files" is given, the build system changes the current working directory to that directory and restarts the make. Kbuild uses "make -f $(srctree)/scripts/Makefile.build obj=<sub-dir>" syntax for descending into sub-directories. (We can write it like "make $(obj)=<sub-dir>" with a shorthand.) This means the current working directory is always the top of the output directory. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com> Tested-by: Gerhard Sittig <gsi@denx.de>
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‎MAKEALL‎

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -674,8 +674,6 @@ build_target() {
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output_dir="${OUTPUT_PREFIX}"
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fi
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export BUILD_DIR="${output_dir}"
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target_arch=$(get_target_arch ${target})
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eval cross_toolchain=\$CROSS_COMPILE_`echo $target_arch | tr '[:lower:]' '[:upper:]'`
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if [ "${cross_toolchain}" ] ; then
@@ -686,6 +684,10 @@ build_target() {
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MAKE=make
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fi
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if [ "${output_dir}" != "." ] ; then
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MAKE="${MAKE} O=${output_dir}"
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fi
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${MAKE} distclean >/dev/null
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${MAKE} -s ${target}_config
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