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# Copyright (C) 2009 Sun Microsystems, Inc
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
FIND_PROGRAM(BISON_EXECUTABLE bison DOC "path to the bison executable")
MARK_AS_ADVANCED(BISON_EXECUTABLE "")
IF(NOT BISON_EXECUTABLE)
MESSAGE("Warning: Bison executable not found in PATH")
ELSEIF(BISON_EXECUTABLE AND NOT BISON_USABLE)
# Check version as well
EXEC_PROGRAM(${BISON_EXECUTABLE} ARGS --version OUTPUT_VARIABLE BISON_VERSION_STR)
# Get first line in case it's multiline
STRING(REGEX REPLACE "([^\n]+).*" "\\1" FIRST_LINE "${BISON_VERSION_STR}")
# get version information
STRING(REGEX REPLACE ".* ([0-9]+)\\.([0-9]+)" "\\1" BISON_VERSION_MAJOR "${FIRST_LINE}")
STRING(REGEX REPLACE ".* ([0-9]+)\\.([0-9]+)" "\\2" BISON_VERSION_MINOR "${FIRST_LINE}")
IF (BISON_VERSION_MAJOR LESS 2)
MESSAGE("Warning: bison version is old. please update to version 2")
ELSE()
SET(BISON_USABLE 1 CACHE INTERNAL "Bison version 2 or higher")
ENDIF()
ENDIF()
# Use bison to generate C++ and header file
MACRO (RUN_BISON input_yy output_cc output_h)
IF(BISON_TOO_OLD)
IF(EXISTS ${output_cc} AND EXISTS ${output_h})
SET(BISON_USABLE FALSE)
ENDIF()
ENDIF()
IF(BISON_USABLE)
ADD_CUSTOM_COMMAND(
OUTPUT ${output_cc}
${output_h}
COMMAND bison -y -p MYSQL
--output=${output_cc}
--defines=${output_h}
${input_yy}
DEPENDS ${input_yy}
)
ELSE()
# Bison is missing or not usable, e.g too old
IF(EXISTS ${output_cc} AND EXISTS ${output_h})
IF(${input_yy} IS_NEWER_THAN ${output_cc} OR ${input_yy} IS_NEWER_THAN ${output_h})
# Possibly timestamps are messed up in source distribution.
MESSAGE("Warning: no usable bison found, ${input_yy} will not be rebuilt.")
ENDIF()
ELSE()
# Output files are missing, bail out.
MESSAGE(FATAL_ERROR "Please install bison.")
ENDIF()
ENDIF()
ENDMACRO()
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