Add C++

templates/tools/doxygen/Doxyfile.c++.template

+<%namespace file="Doxyfile.include" import="gen_doxyfile"/>\
+${gen_doxyfile(['grpc++'], 'C++', libs)}

templates/tools/doxygen/Doxyfile.include

@@ -1570,7 +1570,7 @@ EXTRA_SEARCH_MAPPINGS  =
 # If the GENERATE_LATEX tag is set to YES, doxygen will generate LaTeX output.
 # The default value is: YES.
 
-GENERATE_LATEX         = YES
+GENERATE_LATEX         = NO
 
 # The LATEX_OUTPUT tag is used to specify where the LaTeX docs will be put. If a
 # relative path is entered the value of OUTPUT_DIRECTORY will be put in front of
@@ -2107,7 +2107,7 @@ HIDE_UNDOC_RELATIONS   = YES
 # set to NO
 # The default value is: NO.
 
-HAVE_DOT               = NO
+HAVE_DOT               = YES
 
 # The DOT_NUM_THREADS specifies the number of dot invocations doxygen is allowed
 # to run in parallel. When set to 0 doxygen will base this on the number of

tools/doxygen/Doxyfile.core

@@ -1560,7 +1560,7 @@ EXTRA_SEARCH_MAPPINGS  =
 # If the GENERATE_LATEX tag is set to YES, doxygen will generate LaTeX output.
 # The default value is: YES.
 
-GENERATE_LATEX         = YES
+GENERATE_LATEX         = NO
 
 # The LATEX_OUTPUT tag is used to specify where the LaTeX docs will be put. If a
 # relative path is entered the value of OUTPUT_DIRECTORY will be put in front of
@@ -2097,7 +2097,7 @@ HIDE_UNDOC_RELATIONS   = YES
 # set to NO
 # The default value is: NO.
 
-HAVE_DOT               = NO
+HAVE_DOT               = YES
 
 # The DOT_NUM_THREADS specifies the number of dot invocations doxygen is allowed
 # to run in parallel. When set to 0 doxygen will base this on the number of

tools/doxygen/run_doxygen.sh

@@ -34,7 +34,8 @@ set -ex
 # change to grpc repo root
 cd $(dirname $0)/../..
 
-for i in tools/doxygen/Doxyfile.*
+for i in core c++
 do
-	doxygen $i
+	mkdir -p doc/ref/$i
+	doxygen tools/doxygen/Doxyfile.$i
 done