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Add CMake function to gather cmd arguments #1161

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Add CMake function to gather cmd arguments #1161

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2098e1c
Add cmake function to gather cmd arguments
sfodagain Oct 23, 2024
b107785
Merge branch 'main' into add-cmake-cmd-args
sfod Oct 29, 2024
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36 changes: 36 additions & 0 deletions cmake/AwsGetCmdArguments.cmake
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Original file line number Diff line number Diff line change
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# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: Apache-2.0.

# Get list of variables provided via command line arguments (i.e. -DVARIABLE=VALUE). This function iterates over all
# variables and determines if they're provided via command line or not by checking their help strings. CMake sets help
# strings for variables provided via command line to the "No help, variable specified on the command line." phrase since
# at least v3.0.
# Via https://cmake.org/pipermail/cmake/2018-January/067002.html
#
# MUST be done before call to 'project'. The reason is that project() resets help strings for some variables
# (e.g. CMAKE_INSTALL_PREFIX).
#
# Populate AWS_CMAKE_CMD_ARGS with command line variables and their values.
function(aws_get_cmd_arguments)
if (PROJECT_NAME)
message(WARNING "aws_get_cmd_arguments is called after project(), some variables may be missed")
endif()

if (AWS_CMAKE_CMD_ARGS)
message(STATUS "AWS_CMAKE_CMD_ARGS variable is already set, resetting it")
set(AWS_CMAKE_CMD_ARGS "")
endif()

get_cmake_property(vars CACHE_VARIABLES)
foreach(var ${vars})
get_property(currentHelpString CACHE "${var}" PROPERTY HELPSTRING)
if ("${currentHelpString}" MATCHES "No help, variable specified on the command line.")
set(escaped_var ${${var}})
# To store a list within another list, it needs to be escaped first.
string(REPLACE ";" "\\\\;" escaped_var "${${var}}")
list(APPEND AWS_CMAKE_CMD_ARGS "-D${var}=${escaped_var}")
endif()
endforeach()
# Store cmd variables in the cache.
set(AWS_CMAKE_CMD_ARGS ${AWS_CMAKE_CMD_ARGS} CACHE STRING "Command line variables" FORCE)
endfunction()
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