@@ -31,6 +31,10 @@ baseprereq = $(basename $(notdir $<))
escsq = $(subst $(squote),'\$(squote)',$1)
###
+# Quote a string to pass it to C files. foo => '"foo"'
+stringify = $(squote)$(quote)$1$(quote)$(squote)
+
+###
# Easy method for doing a status message
kecho := :
quiet_kecho := echo
@@ -96,10 +96,11 @@ obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
# Note: Files that end up in two or more modules are compiled without the
# KBUILD_MODNAME definition. The reason is that any made-up name would
# differ in different configs.
-name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
+name-fix = $(call stringify,$(subst $(comma),_,$(subst -,_,$1)))
basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
modname_flags = $(if $(filter 1,$(words $(modname))),\
-DKBUILD_MODNAME=$(call name-fix,$(modname)))
+filepath_flags = -DKBUILD_FILE=$(call stringify,$(src)/$(notdir $<))
orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
$(ccflags-y) $(CFLAGS_$(basetarget).o)
@@ -163,7 +164,7 @@ endif
c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
$(__c_flags) $(modkern_cflags) \
- $(basename_flags) $(modname_flags)
+ $(basename_flags) $(modname_flags) $(filepath_flags)
a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
$(__a_flags) $(modkern_aflags)
Since Kbuild runs in the objtree, __FILE__ can be a very long path depending of $(srctree). Commit 9da0763bdd82 ("kbuild: Use relative path when building in a subdir of the source tree") made the situation better for cases where objtree is a child of srctree. ($(srctree) is "..") For other cases of out-of-tree build, filenames in WARN_ON() etc. are still an absolute path. It also means the kernel image depends on where it was built. Here, the idea is to define a new macro, KBUILD_FILE, to point the relative file path from $(srctree). If we replace __FILE__ with KBUILD_FILE, we can rip off the path to the build directory. I am adding stringify helper because '"..."' wrapping is the same pattern for KBUILD_BASENAME, KBUILD_MODNAME, and KBUILD_FILE. Please note KBUILD_FILE is still an absolute path for external modules. We can strip KBUILD_EXTMOD from the path if we want, but I am not doing that. It would make it difficult to figure out the module in question in case of WARN_ON(). Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> --- scripts/Kbuild.include | 4 ++++ scripts/Makefile.lib | 5 +++-- 2 files changed, 7 insertions(+), 2 deletions(-) -- 2.7.4