[beast: 175/210] DOCS: Makefile.doxygen: support DOXYGEN_TAGFILES configuration

[Tim Janik <timj src gnome org>]

commit b0bd953552f1ad62a9ce89dc76aa542a6590ebbe
Author: Tim Janik <timj gnu org>
Date:   Tue Jun 18 22:08:28 2013 +0200

    DOCS: Makefile.doxygen: support DOXYGEN_TAGFILES configuration

 docs/Makefile.doxygen |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)
---
diff --git a/docs/Makefile.doxygen b/docs/Makefile.doxygen
index 5df3a68..089ce0f 100644
--- a/docs/Makefile.doxygen
+++ b/docs/Makefile.doxygen
@@ -14,6 +14,8 @@ DOXYGEN_CHANGELOG_TITLE ?= Development ChangeLog
 DOXYGEN_GRAPHICS       ?= YES
 # Link markup for the project name
 DOXYGEN_PROJECT_LINK    ?=
+# Tagfile references for Doxygen
+DOXYGEN_TAGFILES        ?=
 
 # == doxygen-full ==
 # build doxygen-html/ from scratch ==
@@ -70,23 +72,26 @@ DOXYGEN_CHANGELOG_SED = \
 
 # == doxygen-html ==
 # configure and run doxygen, handle DOXYGEN="" by creating a dummy docu target
-doxygen-html: doxygen.cfg tagfile-susv4.xml doxygen-srctree
+doxygen-html: doxygen.cfg doxygen-srctree
        $(DOXYGEN_V) "CLEAN" "Html temporaries..."
        $(DOXYGEN_Q) rm -rf doxygen-tmp/ && mkdir -p doxygen-tmp/
        $(DOXYGEN_V) "GEN" "HTML Documentation..."
        $(DOXYGEN_Q) test -n "$(DOXYGEN)" || \
                ( mkdir -p doxygen-tmp/html/ && echo "$(PACKAGE) $(DOXYGEN_PROJECT_NUMBER)" > 
doxygen-tmp/html/index.html )
+       $(DOXYGEN_Q) for tagfile in $(DOXYGEN_TAGFILES) ; do \
+         test -r "$${tagfile/=*/}" || { echo "ERROR: tag file missing or unreadable: $${tagfile/=*/}" >&2 ; 
exit 1 ; } ; done
        $(DOXYGEN_Q) test -z "$(DOXYGEN)" || (cat doxygen.cfg \
        && echo "STRIP_FROM_PATH  = `pwd`/doxygen-srctree" \
        && echo "INPUT            = doxygen-srctree/" \
        && echo "HAVE_DOT         = $(DOXYGEN_GRAPHICS)" \
        && echo "CLASS_DIAGRAMS   = $(DOXYGEN_GRAPHICS)" \
-       && echo "DOT_MULTI_TARGETS = YES" \
        && echo "EXAMPLE_PATH     = $(top_srcdir)/" \
        && echo "OUTPUT_DIRECTORY = doxygen-tmp/" \
        && echo "GENERATE_TAGFILE = doxygen-tmp/html/tagfile.xml" \
-       && echo "TAGFILES         = tagfile-susv4.xml=http://pubs.opengroup.org/onlinepubs/9699919799/"; \
-       && echo -n "PROJECT_NUMBER = $(DOXYGEN_PROJECT_NUMBER)" \
+       && echo "PROJECT_NUMBER   = $(DOXYGEN_PROJECT_NUMBER)" \
+       && echo "DOT_MULTI_TARGETS = YES" \
+       && for tagfile in $(DOXYGEN_TAGFILES) ; do \
+            echo "TAGFILES += $$tagfile" ; done \
        ) > doxygen-tmp/Doxyfile.tmp \
        && nice $(DOXYGEN) doxygen-tmp/Doxyfile.tmp > error.log 2>&1
        $(DOXYGEN_Q) test ! -s error.log && rm -f error.log \