Add a simple script and build target to do a treewide grep for
references to files under Documentation, and report the non-existing
file in stderr. It tries to take into account punctuation not part of
the filename, and wildcards, but there are bound to be false positives
too. Mostly seems accurate though.

We've moved files around enough to make having this worthwhile.

Signed-off-by: Jani Nikula <[email protected]>
---
 Documentation/Makefile               |  4 ++++
 Makefile                             |  2 +-
 scripts/documentation-file-ref-check | 15 +++++++++++++++
 3 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100755 scripts/documentation-file-ref-check

diff --git a/Documentation/Makefile b/Documentation/Makefile
index 85f7856f0092..f4f5aecb81d1 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -97,6 +97,9 @@ endif # HAVE_SPHINX
 # The following targets are independent of HAVE_SPHINX, and the rules should
 # work or silently pass without Sphinx.
 
+refcheckdocs:
+       $(Q)cd $(srctree);scripts/documentation-file-ref-check
+
 cleandocs:
        $(Q)rm -rf $(BUILDDIR)
        $(Q)$(MAKE) BUILDDIR=$(abspath $(BUILDDIR)) 
$(build)=Documentation/media clean
@@ -109,6 +112,7 @@ dochelp:
        @echo  '  epubdocs        - EPUB'
        @echo  '  xmldocs         - XML'
        @echo  '  linkcheckdocs   - check for broken external links (will 
connect to external hosts)'
+       @echo  '  refcheckdocs    - check for references to non-existing files 
under Documentation'
        @echo  '  cleandocs       - clean all generated files'
        @echo
        @echo  '  make SPHINXDIRS="s1 s2" [target] Generate only docs of folder 
s1, s2'
diff --git a/Makefile b/Makefile
index cf007a31d575..a97e70a9a39c 100644
--- a/Makefile
+++ b/Makefile
@@ -1454,7 +1454,7 @@ $(help-board-dirs): help-%:
 
 # Documentation targets
 # ---------------------------------------------------------------------------
-DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs 
linkcheckdocs
+DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs 
linkcheckdocs refcheckdocs
 PHONY += $(DOC_TARGETS)
 $(DOC_TARGETS): scripts_basic FORCE
        $(Q)$(MAKE) $(build)=Documentation $@
diff --git a/scripts/documentation-file-ref-check 
b/scripts/documentation-file-ref-check
new file mode 100755
index 000000000000..bc1659900e89
--- /dev/null
+++ b/scripts/documentation-file-ref-check
@@ -0,0 +1,15 @@
+#!/bin/sh
+# Treewide grep for references to files under Documentation, and report
+# non-existing files in stderr.
+
+for f in $(git ls-files); do
+       for ref in $(grep -ho "Documentation/[A-Za-z0-9_.,~/*+-]*" "$f"); do
+               # presume trailing . and , are not part of the name
+               ref=${ref%%[.,]}
+
+               # use ls to handle wildcards
+               if ! ls $ref >/dev/null 2>&1; then
+                       echo "$f: $ref" >&2
+               fi
+       done
+done
-- 
2.11.0

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