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CMake/Modules/FindRuby.cmake
Evangelos Foutras 802d0aa0b0 FindRuby: Fix output check in _RUBY_CONFIG_VAR 
Since commit v2.8.8~173^2 (FindRuby: clean up querying variables from
Ruby, 2012-02-17) we query RbConfig::CONFIG first and, if the command
fails or its output equates to a false constant, then fall back to
querying Config::CONFIG.

Due to the above, an error condition exists with Ruby 2.2.0; when
querying RbConfig::CONFIG['TEENY'], the output of '0' will be discarded
since it matches the false constant '0'.

In previous versions this wasn't a problem, but Ruby 2.2 has completely
removed Config::CONFIG. This causes RUBY_VERSION_PATCH to be set to an
empty string and the Ruby version to be detected as '2.2.' (instead of
'2.2.0').

Fix the output check to explicitly look for an empty string before using
the fallback query method. (Someone more familiar with Ruby might be
able to deem the fallback as unnecessary and fully remove it.)
2015-01-11 14:49:51 -05:00

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#.rst:
# FindRuby
# --------
#
# Find Ruby
#
# This module finds if Ruby is installed and determines where the
# include files and libraries are. Ruby 1.8, 1.9, 2.0 and 2.1 are
# supported.
#
# The minimum required version of Ruby can be specified using the
# standard syntax, e.g. find_package(Ruby 1.8)
#
# It also determines what the name of the library is. This code sets
# the following variables:
#
# ``RUBY_EXECUTABLE``
# full path to the ruby binary
# ``RUBY_INCLUDE_DIRS``
# include dirs to be used when using the ruby library
# ``RUBY_LIBRARY``
# full path to the ruby library
# ``RUBY_VERSION``
# the version of ruby which was found, e.g. "1.8.7"
# ``RUBY_FOUND``
# set to true if ruby ws found successfully
#
# Also:
#
# ``RUBY_INCLUDE_PATH``
# same as RUBY_INCLUDE_DIRS, only provided for compatibility reasons, don't use it
#=============================================================================
# Copyright 2004-2009 Kitware, Inc.
# Copyright 2008-2009 Alexander Neundorf <neundorf@kde.org>
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)
# RUBY_ARCHDIR=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"archdir"@:>@)'`
# RUBY_SITEARCHDIR=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"sitearchdir"@:>@)'`
# RUBY_SITEDIR=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"sitelibdir"@:>@)'`
# RUBY_LIBDIR=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"libdir"@:>@)'`
# RUBY_LIBRUBYARG=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"LIBRUBYARG_SHARED"@:>@)'`
# uncomment the following line to get debug output for this file
# set(_RUBY_DEBUG_OUTPUT TRUE)
# Determine the list of possible names of the ruby executable depending
# on which version of ruby is required
set(_RUBY_POSSIBLE_EXECUTABLE_NAMES ruby)
# if 1.9 is required, don't look for ruby18 and ruby1.8, default to version 1.8
if(Ruby_FIND_VERSION_MAJOR AND Ruby_FIND_VERSION_MINOR)
set(Ruby_FIND_VERSION_SHORT_NODOT "${Ruby_FIND_VERSION_MAJOR}${RUBY_FIND_VERSION_MINOR}")
# we can't construct that if only major version is given
set(_RUBY_POSSIBLE_EXECUTABLE_NAMES
ruby${Ruby_FIND_VERSION_MAJOR}.${Ruby_FIND_VERSION_MINOR}
ruby${Ruby_FIND_VERSION_MAJOR}${Ruby_FIND_VERSION_MINOR}
${_RUBY_POSSIBLE_EXECUTABLE_NAMES})
else()
set(Ruby_FIND_VERSION_SHORT_NODOT "18")
endif()
if(NOT Ruby_FIND_VERSION_EXACT)
list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby2.1 ruby21)
list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby2.0 ruby20)
list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby1.9 ruby19)
# if we want a version below 1.9, also look for ruby 1.8
if("${Ruby_FIND_VERSION_SHORT_NODOT}" VERSION_LESS "19")
list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby1.8 ruby18)
endif()
list(REMOVE_DUPLICATES _RUBY_POSSIBLE_EXECUTABLE_NAMES)
endif()
find_program(RUBY_EXECUTABLE NAMES ${_RUBY_POSSIBLE_EXECUTABLE_NAMES})
if(RUBY_EXECUTABLE AND NOT RUBY_VERSION_MAJOR)
function(_RUBY_CONFIG_VAR RBVAR OUTVAR)
execute_process(COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print RbConfig::CONFIG['${RBVAR}']"
RESULT_VARIABLE _RUBY_SUCCESS
OUTPUT_VARIABLE _RUBY_OUTPUT
ERROR_QUIET)
if(_RUBY_SUCCESS OR _RUBY_OUTPUT STREQUAL "")
execute_process(COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print Config::CONFIG['${RBVAR}']"
RESULT_VARIABLE _RUBY_SUCCESS
OUTPUT_VARIABLE _RUBY_OUTPUT
ERROR_QUIET)
endif()
set(${OUTVAR} "${_RUBY_OUTPUT}" PARENT_SCOPE)
endfunction()
# query the ruby version
_RUBY_CONFIG_VAR("MAJOR" RUBY_VERSION_MAJOR)
_RUBY_CONFIG_VAR("MINOR" RUBY_VERSION_MINOR)
_RUBY_CONFIG_VAR("TEENY" RUBY_VERSION_PATCH)
# query the different directories
_RUBY_CONFIG_VAR("archdir" RUBY_ARCH_DIR)
_RUBY_CONFIG_VAR("arch" RUBY_ARCH)
_RUBY_CONFIG_VAR("rubyhdrdir" RUBY_HDR_DIR)
_RUBY_CONFIG_VAR("rubyarchhdrdir" RUBY_ARCHHDR_DIR)
_RUBY_CONFIG_VAR("libdir" RUBY_POSSIBLE_LIB_DIR)
_RUBY_CONFIG_VAR("rubylibdir" RUBY_RUBY_LIB_DIR)
# site_ruby
_RUBY_CONFIG_VAR("sitearchdir" RUBY_SITEARCH_DIR)
_RUBY_CONFIG_VAR("sitelibdir" RUBY_SITELIB_DIR)
# vendor_ruby available ?
execute_process(COMMAND ${RUBY_EXECUTABLE} -r vendor-specific -e "print 'true'"
OUTPUT_VARIABLE RUBY_HAS_VENDOR_RUBY ERROR_QUIET)
if(RUBY_HAS_VENDOR_RUBY)
_RUBY_CONFIG_VAR("vendorlibdir" RUBY_VENDORLIB_DIR)
_RUBY_CONFIG_VAR("vendorarchdir" RUBY_VENDORARCH_DIR)
endif()
# save the results in the cache so we don't have to run ruby the next time again
set(RUBY_VERSION_MAJOR ${RUBY_VERSION_MAJOR} CACHE PATH "The Ruby major version" FORCE)
set(RUBY_VERSION_MINOR ${RUBY_VERSION_MINOR} CACHE PATH "The Ruby minor version" FORCE)
set(RUBY_VERSION_PATCH ${RUBY_VERSION_PATCH} CACHE PATH "The Ruby patch version" FORCE)
set(RUBY_ARCH_DIR ${RUBY_ARCH_DIR} CACHE PATH "The Ruby arch dir" FORCE)
set(RUBY_HDR_DIR ${RUBY_HDR_DIR} CACHE PATH "The Ruby header dir (1.9+)" FORCE)
set(RUBY_ARCHHDR_DIR ${RUBY_ARCHHDR_DIR} CACHE PATH "The Ruby arch header dir (2.0+)" FORCE)
set(RUBY_POSSIBLE_LIB_DIR ${RUBY_POSSIBLE_LIB_DIR} CACHE PATH "The Ruby lib dir" FORCE)
set(RUBY_RUBY_LIB_DIR ${RUBY_RUBY_LIB_DIR} CACHE PATH "The Ruby ruby-lib dir" FORCE)
set(RUBY_SITEARCH_DIR ${RUBY_SITEARCH_DIR} CACHE PATH "The Ruby site arch dir" FORCE)
set(RUBY_SITELIB_DIR ${RUBY_SITELIB_DIR} CACHE PATH "The Ruby site lib dir" FORCE)
set(RUBY_HAS_VENDOR_RUBY ${RUBY_HAS_VENDOR_RUBY} CACHE BOOL "Vendor Ruby is available" FORCE)
set(RUBY_VENDORARCH_DIR ${RUBY_VENDORARCH_DIR} CACHE PATH "The Ruby vendor arch dir" FORCE)
set(RUBY_VENDORLIB_DIR ${RUBY_VENDORLIB_DIR} CACHE PATH "The Ruby vendor lib dir" FORCE)
mark_as_advanced(
RUBY_ARCH_DIR
RUBY_ARCH
RUBY_HDR_DIR
RUBY_ARCHHDR_DIR
RUBY_POSSIBLE_LIB_DIR
RUBY_RUBY_LIB_DIR
RUBY_SITEARCH_DIR
RUBY_SITELIB_DIR
RUBY_HAS_VENDOR_RUBY
RUBY_VENDORARCH_DIR
RUBY_VENDORLIB_DIR
RUBY_VERSION_MAJOR
RUBY_VERSION_MINOR
RUBY_VERSION_PATCH
)
endif()
# In case RUBY_EXECUTABLE could not be executed (e.g. cross compiling)
# try to detect which version we found. This is not too good.
if(RUBY_EXECUTABLE AND NOT RUBY_VERSION_MAJOR)
# by default assume 1.8.0
set(RUBY_VERSION_MAJOR 1)
set(RUBY_VERSION_MINOR 8)
set(RUBY_VERSION_PATCH 0)
# check whether we found 1.9.x
if(${RUBY_EXECUTABLE} MATCHES "ruby1.?9")
set(RUBY_VERSION_MAJOR 1)
set(RUBY_VERSION_MINOR 9)
endif()
# check whether we found 2.0.x
if(${RUBY_EXECUTABLE} MATCHES "ruby2.?0")
set(RUBY_VERSION_MAJOR 2)
set(RUBY_VERSION_MINOR 0)
endif()
# check whether we found 2.1.x
if(${RUBY_EXECUTABLE} MATCHES "ruby2.?1")
set(RUBY_VERSION_MAJOR 2)
set(RUBY_VERSION_MINOR 1)
endif()
endif()
if(RUBY_VERSION_MAJOR)
set(RUBY_VERSION "${RUBY_VERSION_MAJOR}.${RUBY_VERSION_MINOR}.${RUBY_VERSION_PATCH}")
set(_RUBY_VERSION_SHORT "${RUBY_VERSION_MAJOR}.${RUBY_VERSION_MINOR}")
set(_RUBY_VERSION_SHORT_NODOT "${RUBY_VERSION_MAJOR}${RUBY_VERSION_MINOR}")
set(_RUBY_NODOT_VERSION "${RUBY_VERSION_MAJOR}${RUBY_VERSION_MINOR}${RUBY_VERSION_PATCH}")
endif()
find_path(RUBY_INCLUDE_DIR
NAMES ruby.h
HINTS
${RUBY_HDR_DIR}
${RUBY_ARCH_DIR}
/usr/lib/ruby/${_RUBY_VERSION_SHORT}/i586-linux-gnu/ )
set(RUBY_INCLUDE_DIRS ${RUBY_INCLUDE_DIR} )
# if ruby > 1.8 is required or if ruby > 1.8 was found, search for the config.h dir
if( "${Ruby_FIND_VERSION_SHORT_NODOT}" GREATER 18 OR "${_RUBY_VERSION_SHORT_NODOT}" GREATER 18 OR RUBY_HDR_DIR)
find_path(RUBY_CONFIG_INCLUDE_DIR
NAMES ruby/config.h config.h
HINTS
${RUBY_HDR_DIR}/${RUBY_ARCH}
${RUBY_ARCH_DIR}
${RUBY_ARCHHDR_DIR}
)
set(RUBY_INCLUDE_DIRS ${RUBY_INCLUDE_DIRS} ${RUBY_CONFIG_INCLUDE_DIR} )
endif()
# Determine the list of possible names for the ruby library
set(_RUBY_POSSIBLE_LIB_NAMES ruby ruby-static ruby${_RUBY_VERSION_SHORT} ruby${_RUBY_VERSION_SHORT_NODOT} ruby-${_RUBY_VERSION_SHORT} ruby-${RUBY_VERSION})
if(WIN32)
set( _RUBY_MSVC_RUNTIME "" )
if( MSVC60 )
set( _RUBY_MSVC_RUNTIME "60" )
endif()
if( MSVC70 )
set( _RUBY_MSVC_RUNTIME "70" )
endif()
if( MSVC71 )
set( _RUBY_MSVC_RUNTIME "71" )
endif()
if( MSVC80 )
set( _RUBY_MSVC_RUNTIME "80" )
endif()
if( MSVC90 )
set( _RUBY_MSVC_RUNTIME "90" )
endif()
list(APPEND _RUBY_POSSIBLE_LIB_NAMES
"msvcr${_RUBY_MSVC_RUNTIME}-ruby${_RUBY_NODOT_VERSION}"
"msvcr${_RUBY_MSVC_RUNTIME}-ruby${_RUBY_NODOT_VERSION}-static"
"msvcrt-ruby${_RUBY_NODOT_VERSION}"
"msvcrt-ruby${_RUBY_NODOT_VERSION}-static" )
endif()
find_library(RUBY_LIBRARY NAMES ${_RUBY_POSSIBLE_LIB_NAMES} HINTS ${RUBY_POSSIBLE_LIB_DIR} )
include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
set(_RUBY_REQUIRED_VARS RUBY_EXECUTABLE RUBY_INCLUDE_DIR RUBY_LIBRARY)
if(_RUBY_VERSION_SHORT_NODOT GREATER 18)
list(APPEND _RUBY_REQUIRED_VARS RUBY_CONFIG_INCLUDE_DIR)
endif()
if(_RUBY_DEBUG_OUTPUT)
message(STATUS "--------FindRuby.cmake debug------------")
message(STATUS "_RUBY_POSSIBLE_EXECUTABLE_NAMES: ${_RUBY_POSSIBLE_EXECUTABLE_NAMES}")
message(STATUS "_RUBY_POSSIBLE_LIB_NAMES: ${_RUBY_POSSIBLE_LIB_NAMES}")
message(STATUS "RUBY_ARCH_DIR: ${RUBY_ARCH_DIR}")
message(STATUS "RUBY_HDR_DIR: ${RUBY_HDR_DIR}")
message(STATUS "RUBY_POSSIBLE_LIB_DIR: ${RUBY_POSSIBLE_LIB_DIR}")
message(STATUS "Found RUBY_VERSION: \"${RUBY_VERSION}\" , short: \"${_RUBY_VERSION_SHORT}\", nodot: \"${_RUBY_VERSION_SHORT_NODOT}\"")
message(STATUS "_RUBY_REQUIRED_VARS: ${_RUBY_REQUIRED_VARS}")
message(STATUS "RUBY_EXECUTABLE: ${RUBY_EXECUTABLE}")
message(STATUS "RUBY_LIBRARY: ${RUBY_LIBRARY}")
message(STATUS "RUBY_INCLUDE_DIR: ${RUBY_INCLUDE_DIR}")
message(STATUS "RUBY_CONFIG_INCLUDE_DIR: ${RUBY_CONFIG_INCLUDE_DIR}")
message(STATUS "--------------------")
endif()
FIND_PACKAGE_HANDLE_STANDARD_ARGS(Ruby REQUIRED_VARS ${_RUBY_REQUIRED_VARS}
VERSION_VAR RUBY_VERSION )
mark_as_advanced(
RUBY_EXECUTABLE
RUBY_LIBRARY
RUBY_INCLUDE_DIR
RUBY_CONFIG_INCLUDE_DIR
)
# Set some variables for compatibility with previous version of this file
set(RUBY_POSSIBLE_LIB_PATH ${RUBY_POSSIBLE_LIB_DIR})
set(RUBY_RUBY_LIB_PATH ${RUBY_RUBY_LIB_DIR})
set(RUBY_INCLUDE_PATH ${RUBY_INCLUDE_DIRS})
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