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bison.cmake
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bison.cmake
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# Copyright (c) 2009, 2019, Oracle and/or its affiliates. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License, version 2.0,
# as published by the Free Software Foundation.
#
# This program is also distributed with certain software (including
# but not limited to OpenSSL) that is licensed under separate terms,
# as designated in a particular file or component or in included license
# documentation. The authors of MySQL hereby grant you an additional
# permission to link the program and your derivative works with the
# separately licensed software that they have included with MySQL.
#
# 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, version 2.0, 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(${BISON_EXECUTABLE} ARGS --version OUTPUT_VARIABLE BISON_OUTPUT)
# get version information
STRING(REGEX REPLACE
"^bison \\(GNU Bison\\) ([0-9]+\\.[0-9]+(\\.[0-9]+)?).*" "\\1"
BISON_VERSION "${BISON_OUTPUT}")
MESSAGE(STATUS
"Found Bison: ${BISON_EXECUTABLE} (found version is ${BISON_VERSION})")
IF (BISON_VERSION VERSION_LESS "2.1")
MESSAGE(WARNING "Bison version ${BISON_VERSION} is old. \
Please update to version 2.1 or higher")
ELSE()
SET(BISON_USABLE 1 CACHE INTERNAL "Bison version 2 or higher")
IF(BISON_VERSION VERSION_LESS "2.4")
# Don't use --warnings since unsupported
SET(BISON_FLAGS_WARNINGS "" CACHE INTERNAL "BISON 2.x flags")
ELSEIF(BISON_VERSION VERSION_LESS "3.0")
# Enable all warnings
SET(BISON_FLAGS_WARNINGS
"--warnings=all"
CACHE INTERNAL "BISON 2.x flags")
ELSE()
# TODO: replace with "--warnings=all"
# For the backward compatibility with 2.x, suppress warnings:
# * no-yacc: for --yacc
# * no-empty-rule: for empty rules without %empty
# * no-precedence: for useless precedence or/and associativity rules
SET(BISON_FLAGS_WARNINGS
"--warnings=all,no-yacc,no-empty-rule,no-precedence"
CACHE INTERNAL "BISON 3.x flags")
ENDIF()
ENDIF()
ENDIF()
# Handle out-of-source build from source package with possibly broken
# bison. Copy bison output to from source to build directory, if not already
# there
MACRO(COPY_BISON_OUTPUT input_cc input_h output_cc output_h)
IF(EXISTS ${input_cc} AND NOT EXISTS ${output_cc})
CONFIGURE_FILE(${input_cc} ${output_cc} COPYONLY)
CONFIGURE_FILE(${input_h} ${output_h} COPYONLY)
ENDIF()
ENDMACRO()
# Use bison to generate C++ and header file
MACRO (RUN_BISON input_yy output_cc output_h name_prefix)
IF(BISON_USABLE)
ADD_CUSTOM_COMMAND(
OUTPUT ${output_cc}
${output_h}
COMMAND ${BISON_EXECUTABLE}
--name-prefix=${name_prefix}
--yacc
${BISON_FLAGS_WARNINGS}
--output=${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.
SET(ERRMSG
"Bison (GNU parser generator) is required to build MySQL."
"Please install bison."
)
IF(WIN32)
SET(ERRMSG ${ERRMSG}
"You can download bison from http://gnuwin32.sourceforge.net/packages/bison.htm "
"Choose 'Complete package, except sources' installation. We recommend to "
"install bison into a directory without spaces, e.g C:\\GnuWin32.")
ENDIF()
MESSAGE(FATAL_ERROR ${ERRMSG})
ENDIF()
ENDIF()
ENDMACRO()