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authorMasahiro Yamada <yamada.masahiro@socionext.com>2019-07-06 06:07:13 +0300
committerMasahiro Yamada <yamada.masahiro@socionext.com>2019-07-10 18:05:09 +0300
commit95fd3f87bfbe8edaa5e955e0f858a0a573c09ab6 (patch)
treef716e4fb759895a5f8354d0b4612c91ddf315295 /Makefile
parent051f278e9d81bed253bf89c66c80b8b921aafa8a (diff)
downloadlinux-95fd3f87bfbe8edaa5e955e0f858a0a573c09ab6.tar.xz
kbuild: add a flag to force absolute path for srctree
In old days, Kbuild always used an absolute path for $(srctree). Since commit 890676c65d69 ("kbuild: Use relative path when building in the source tree"), $(srctree) is '.' when O= was not passed from the command line. Yet, using absolute paths is useful in some cases even without O=, for instance, to create a cscope file with absolute path tags. 'O=.' was known to work as a workaround to force Kbuild to use absolute paths even when you are building in the source tree. Since commit 25b146c5b8ce ("kbuild: allow Kbuild to start from any directory"), Kbuild is too clever to be tricked. Even if you pass 'O=.' Kbuild notices you are building in the source tree, then use '.' for $(srctree). So, 'make O=. cscope' is no help to create absolute path tags. We cannot force one or the other according to commit e93bc1a0cab3 ("Revert "kbuild: specify absolute paths for cscope""). Both of relative path and absolute path have pros and cons. This commit adds a new flag KBUILD_ABS_SRCTREE to allow users to choose the absolute path for $(srctree). 'make KBUILD_ABS_SRCTREE=1 cscope' will work as a replacement of 'make O=. cscope'. Reported-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'Makefile')
-rw-r--r--Makefile4
1 files changed, 4 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index 91ad737ff538..357fd3623144 100644
--- a/Makefile
+++ b/Makefile
@@ -244,6 +244,10 @@ else
building_out_of_srctree := 1
endif
+ifneq ($(KBUILD_ABS_SRCTREE),)
+srctree := $(abs_srctree)
+endif
+
objtree := .
VPATH := $(srctree)