FindBISON: Add DEFINES_FILE option to pass --defines=FILE

Modules/FindBISON.cmake

@@ -22,6 +22,7 @@
 #
 #   BISON_TARGET(<Name> <YaccInput> <CodeOutput>
 #                [COMPILE_FLAGS <flags>]
+#                [DEFINES_FILE <file>]
 #                [VERBOSE <file>]
 #                )
 #
@@ -35,6 +36,9 @@
 # ``COMPILE_FLAGS <flags>``
 #   Specify flags to be added to the ``bison`` command line.
 #
+# ``DEFINES_FILE <file>``
+#   Specify a non-default header ``<file>`` to be generated by ``bison``.
+#
 # ``VERBOSE <file>``
 #   Tell ``bison`` to write verbose descriptions of the grammar and
 #   parser to the given ``<file>``.
@@ -64,7 +68,8 @@
 # .. code-block:: cmake
 #
 #   find_package(BISON)
-#   BISON_TARGET(MyParser parser.y ${CMAKE_CURRENT_BINARY_DIR}/parser.cpp)
+#   BISON_TARGET(MyParser parser.y ${CMAKE_CURRENT_BINARY_DIR}/parser.cpp
+#                DEFINES_FILE ${CMAKE_CURRENT_BINARY_DIR}/parser.h)
 #   add_executable(Foo main.cpp ${BISON_MyParser_OUTPUTS})
 
 #=============================================================================
@@ -140,6 +145,12 @@ if(BISON_EXECUTABLE)
     list(APPEND BISON_TARGET_cmdopt ${BISON_TARGET_extraopts})
   endmacro()
 
+  # internal macro
+  macro(BISON_TARGET_option_defines Header)
+    set(BISON_TARGET_output_header "${Header}")
+    list(APPEND BISON_TARGET_cmdopt --defines=${BISON_TARGET_output_header})
+  endmacro()
+
   #============================================================
   # BISON_TARGET (public macro)
   #============================================================
@@ -154,6 +165,7 @@ if(BISON_EXECUTABLE)
     set(BISON_TARGET_PARAM_ONE_VALUE_KEYWORDS
       VERBOSE
       COMPILE_FLAGS
+      DEFINES_FILE
       )
     set(BISON_TARGET_PARAM_MULTI_VALUE_KEYWORDS)
     cmake_parse_arguments(
@@ -173,14 +185,19 @@ if(BISON_EXECUTABLE)
       if(NOT "${BISON_TARGET_ARG_COMPILE_FLAGS}" STREQUAL "")
         BISON_TARGET_option_extraopts("${BISON_TARGET_ARG_COMPILE_FLAGS}")
       endif()
+      if(NOT "${BISON_TARGET_ARG_DEFINES_FILE}" STREQUAL "")
+        BISON_TARGET_option_defines("${BISON_TARGET_ARG_DEFINES_FILE}")
+      endif()
 
-      # Header's name generated by bison (see option -d)
-      list(APPEND BISON_TARGET_cmdopt "-d")
-      string(REGEX REPLACE "^(.*)(\\.[^.]*)$" "\\2" _fileext "${BisonOutput}")
-      string(REPLACE "c" "h" _fileext ${_fileext})
-      string(REGEX REPLACE "^(.*)(\\.[^.]*)$" "\\1${_fileext}"
-          BISON_${Name}_OUTPUT_HEADER "${BisonOutput}")
-      list(APPEND BISON_TARGET_outputs "${BISON_${Name}_OUTPUT_HEADER}")
+      if("${BISON_TARGET_output_header}" STREQUAL "")
+        # Header's name generated by bison (see option -d)
+        list(APPEND BISON_TARGET_cmdopt "-d")
+        string(REGEX REPLACE "^(.*)(\\.[^.]*)$" "\\2" _fileext "${BisonOutput}")
+        string(REPLACE "c" "h" _fileext ${_fileext})
+        string(REGEX REPLACE "^(.*)(\\.[^.]*)$" "\\1${_fileext}"
+            BISON_TARGET_output_header "${BisonOutput}")
+      endif()
+      list(APPEND BISON_TARGET_outputs "${BISON_TARGET_output_header}")
 
       add_custom_command(OUTPUT ${BISON_TARGET_outputs}
         ${BISON_TARGET_extraoutputs}
@@ -196,6 +213,7 @@ if(BISON_EXECUTABLE)
       set(BISON_${Name}_OUTPUTS ${BISON_TARGET_outputs})
       set(BISON_${Name}_COMPILE_FLAGS ${BISON_TARGET_cmdopt})
       set(BISON_${Name}_OUTPUT_SOURCE "${BisonOutput}")
+      set(BISON_${Name}_OUTPUT_HEADER "${BISON_TARGET_output_header}")
 
     endif()
   endmacro()