docs: Makefile: use the right path for DOCS_CSS
When make is used with O=<dir>, the location of the css file
won't be get right:
$ make DOCS_THEME=nature DOCS_CSS=my_css.css O=DOCS SPHINXDIRS=x86 -j9 htmldocs
make[1]: Entering directory '/work/lnx/next/next-2021-1210/DOCS'
...
cp: cannot stat 'my_css.css': No such file or directory
Fix it in a way that both relative and absolute paths will be
handled.
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/cea4ff1237ae9a99bc6509ab1bf9c70acd97e265.1639212812.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/Makefile b/Documentation/Makefile
index 9f0f53d..c9543b6 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -88,7 +88,7 @@
$(abspath $(srctree)/$(src)/$5) \
$(abspath $(BUILDDIR)/$3/$4) && \
if [ "x$(DOCS_CSS)" != "x" ]; then \
- cp $(DOCS_CSS) $(BUILDDIR)/$3/_static/; \
+ cp $(if $(patsubst /%,,$(DOCS_CSS)),$(abspath $(srctree)/$(DOCS_CSS)),$(DOCS_CSS)) $(BUILDDIR)/$3/_static/; \
fi
htmldocs: