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# (C) Copyright 2011- ECMWF.
#
# This software is licensed under the terms of the Apache Licence Version 2.0
# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
# In applying this licence, ECMWF does not waive the privileges and immunities
# granted to it by virtue of its status as an intergovernmental organisation nor
# does it submit to any jurisdiction.
##############################################################################
#.rst:
#
# ecbuild_find_lexyacc
# ====================
#
# Find flex and bison (preferred) or lex and yacc.
#
# Input variables
# ---------------
#
# The following CMake variables can set to skip search for bison or yacc:
#
# :SKIP_BISON: do not search for flex and bison
# :SKIP_YACC: do not search for lex and yacc
#
# Output variables
# ----------------
#
# The following CMake variables are set if flex and bison were found:
#
# :FLEX_FOUND: flex was found
# :BISON_FOUND: bison was found
# :FLEX_EXECUTABLE: path to the flex executable
# :BISON_EXECUTABLE: path to the bison executable
#
# The following CMake variables are set if lex and yacc were found:
#
# :LEXYACC_FOUND: Found suitable combination of bison, lex, yacc, flex
# :LEX_FOUND: lex was found
# :YACC_FOUND: yacc was found
# :LEX_EXECUTABLE: path to the lex executable
# :YACC_EXECUTABLE: path to the yacc executable
#
##############################################################################
macro( ecbuild_find_lexyacc )
# find preferably bison or else yacc
if( NOT SKIP_BISON )
find_package( BISON )
if(BISON_FOUND AND BISON_VERSION VERSION_LESS 2.3 )
ecbuild_critical( "Bison found with version ${BISON_VERSION} is less than 2.3.\nPlease define BISON_EXECUTABLE to an appropriate version or define SKIP_BISON to try finding Yacc instead" )
endif()
find_package( FLEX )
endif()
if( NOT BISON_FOUND AND NOT SKIP_YACC )
find_package( YACC )
find_package( LEX )
endif()
set( LEXYACC_FOUND 1 )
if( NOT YACC_FOUND AND NOT BISON_FOUND ) # neither bison nor yacc were found
ecbuild_debug( "Neither bison or yacc were found - at least one is required (together with its lexical analyser" )
set( LEXYACC_FOUND 0 )
endif()
if( NOT YACC_FOUND ) # check for both bison & flex together
if( BISON_FOUND AND NOT FLEX_FOUND )
set( LEXYACC_FOUND 0 )
ecbuild_debug( "Both bison and flex are required - flex not found" )
endif()
if( FLEX_FOUND AND NOT BISON_FOUND )
set( LEXYACC_FOUND 0 )
ecbuild_debug( "Both bison and flex are required - bison not found" )
endif()
endif()
if( NOT BISON_FOUND ) # check for both yacc & lex together
if( YACC_FOUND AND NOT LEX_FOUND )
set( LEXYACC_FOUND 0 )
ecbuild_debug( "Both yacc and lex are required - lex not found" )
endif()
if( LEX_FOUND AND NOT YACC_FOUND )
set( LEXYACC_FOUND 0 )
ecbuild_debug( "Both yacc and lex are required - yacc not found" )
endif()
endif()
endmacro( ecbuild_find_lexyacc )
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