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include(CMakeParseArguments)
function(precondition var)
cmake_parse_arguments(
PRECONDITION # prefix
"NEGATE" # options
"MESSAGE" # single-value args
"" # multi-value args
${ARGN})
if (PRECONDITION_NEGATE)
if (${var})
if (PRECONDITION_MESSAGE)
message(FATAL_ERROR "Error! ${PRECONDITION_MESSAGE}")
else()
message(FATAL_ERROR "Error! Variable ${var} is true or not empty. The value of ${var} is ${${var}}.")
endif()
endif()
else()
if (NOT ${var})
if (PRECONDITION_MESSAGE)
message(FATAL_ERROR "Error! ${PRECONDITION_MESSAGE}")
else()
message(FATAL_ERROR "Error! Variable ${var} is false, empty or not set.")
endif()
endif()
endif()
endfunction()
# Translate a yes/no variable to the presence of a given string in a
# variable.
#
# Usage:
# translate_flag(is_set flag_name var_name)
#
# If is_set is true, sets ${var_name} to ${flag_name}. Otherwise,
# unsets ${var_name}.
function(translate_flag is_set flag_name var_name)
if(${is_set})
set("${var_name}" "${flag_name}" PARENT_SCOPE)
else()
set("${var_name}" "" PARENT_SCOPE)
endif()
endfunction()
# Run a shell command and assign output to a variable or fail with an error.
# Example usage:
# runcmd(COMMAND "xcode-select" "-p"
# VARIABLE xcodepath
# ERROR "Unable to find current Xcode path")
function(runcmd)
cmake_parse_arguments(RUNCMD "" "VARIABLE;ERROR" "COMMAND" ${ARGN})
execute_process(
COMMAND ${RUNCMD_COMMAND}
OUTPUT_VARIABLE ${RUNCMD_VARIABLE}
RESULT_VARIABLE result
ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
if(NOT "${result}" MATCHES "0")
message(FATAL_ERROR "${RUNCMD_ERROR}")
endif()
set(${RUNCMD_VARIABLE} ${${RUNCMD_VARIABLE}} PARENT_SCOPE)
endfunction(runcmd)
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