Sync with changes from r300825 in clang.

Generate the better include paths. Instead of #include <llvm_header.h> doxygen
produces #include "llvm/Folder/llvm_header.h"

Patch by Yuka Takahashi (D32342)!

llvm-svn: 301569

Author: vgvassilev

llvm/docs/CMakeLists.txt

@@ -1,8 +1,8 @@
 
 if (DOXYGEN_FOUND)
 if (LLVM_ENABLE_DOXYGEN)
-  set(abs_top_srcdir ${LLVM_MAIN_SRC_DIR})
-  set(abs_top_builddir ${LLVM_BINARY_DIR})
+  set(abs_top_srcdir ${CMAKE_CURRENT_SOURCE_DIR})
+  set(abs_top_builddir ${CMAKE_CURRENT_BINARY_DIR})
 
   if (HAVE_DOT)
     set(DOT ${LLVM_PATH_DOT})

llvm/docs/README.txt

@@ -51,3 +51,18 @@ running:
 
     cd docs/
     make -f Makefile.sphinx linkcheck
+
+Doxygen page Output
+==============
+
+Install doxygen <http://www.stack.nl/~dimitri/doxygen/download.html> and dot2tex <https://dot2tex.readthedocs.io/en/latest>.
+
+    cd <build-dir>
+    cmake -DLLVM_ENABLE_DOXYGEN=On <llvm-top-src-dir>
+    make doxygen-llvm # for LLVM docs
+    make doxygen-clang # for clang docs
+
+It will generate html in
+    
+    <build-dir>/docs/doxygen/html # for LLVM docs
+    <build-dir>/tools/clang/docs/doxygen/html # for clang docs

llvm/docs/doxygen.cfg.in

@@ -58,7 +58,7 @@ PROJECT_LOGO           =
 # entered, it will be relative to the location where doxygen was started. If
 # left blank the current directory will be used.
 
-OUTPUT_DIRECTORY       = @abs_top_builddir@/docs/doxygen
+OUTPUT_DIRECTORY       = @abs_top_builddir@/doxygen
 
 # If the CREATE_SUBDIRS tag is set to YES, then doxygen will create 4096 sub-
 # directories (in 2 levels) under the output directory of each output format and
@@ -132,7 +132,7 @@ INLINE_INHERITED_MEMB  = NO
 # shortest path that makes the file name unique will be used
 # The default value is: YES.
 
-FULL_PATH_NAMES        = NO
+FULL_PATH_NAMES        = YES
 
 # The STRIP_FROM_PATH tag can be used to strip a user-defined part of the path.
 # Stripping is only done if one of the specified strings matches the left-hand
@@ -144,7 +144,7 @@ FULL_PATH_NAMES        = NO
 # will be relative from the directory where doxygen is started.
 # This tag requires that the tag FULL_PATH_NAMES is set to YES.
 
-STRIP_FROM_PATH        = ../..
+STRIP_FROM_PATH        = @abs_top_srcdir@/..
 
 # The STRIP_FROM_INC_PATH tag can be used to strip a user-defined part of the
 # path mentioned in the documentation of a class, which tells the reader which
@@ -153,7 +153,8 @@ STRIP_FROM_PATH        = ../..
 # specify the list of include paths that are normally passed to the compiler
 # using the -I flag.
 
-STRIP_FROM_INC_PATH    =
+STRIP_FROM_INC_PATH    = @abs_top_srcdir@/../include
+STRIP_FROM_INC_PATH    += @abs_top_srcdir@/../lib
 
 # If the SHORT_NAMES tag is set to YES, doxygen will generate much shorter (but
 # less readable) file names. This can be useful is your file systems doesn't
@@ -513,7 +514,7 @@ SHOW_GROUPED_MEMB_INC  = NO
 # files with double quotes in the documentation rather than with sharp brackets.
 # The default value is: NO.
 
-FORCE_LOCAL_INCLUDES   = NO
+FORCE_LOCAL_INCLUDES   = YES
 
 # If the INLINE_INFO tag is set to YES then a tag [inline] is inserted in the
 # documentation for inline members.
@@ -743,9 +744,9 @@ WARN_LOGFILE           =
 # spaces.
 # Note: If this tag is empty the current directory is searched.
 
-INPUT                  = @abs_top_srcdir@/include \
-                         @abs_top_srcdir@/lib \
-                         @abs_top_srcdir@/docs/doxygen-mainpage.dox
+INPUT                  = @abs_top_srcdir@/../include \
+                         @abs_top_srcdir@/../lib \
+                         @abs_top_srcdir@/doxygen-mainpage.dox
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses
@@ -813,7 +814,7 @@ EXCLUDE_SYMBOLS        =
 # that contain example code fragments that are included (see the \include
 # command).
 
-EXAMPLE_PATH           = @abs_top_srcdir@/examples
+EXAMPLE_PATH           = @abs_top_srcdir@/../examples
 
 # If the value of the EXAMPLE_PATH tag contains directories, you can use the
 # EXAMPLE_PATTERNS tag to specify one or more wildcard pattern (like *.cpp and
@@ -833,7 +834,7 @@ EXAMPLE_RECURSIVE      = YES
 # that contain images that are to be included in the documentation (see the
 # \image command).
 
-IMAGE_PATH             = @abs_top_srcdir@/docs/img
+IMAGE_PATH             = @abs_top_srcdir@/img
 
 # The INPUT_FILTER tag can be used to specify a program that doxygen should
 # invoke to filter for each input file. Doxygen will invoke the filter program