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# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: Apache-2.0.
# This function detects the local host's c runtime and writes a tag into the supplied output variable
# Output is "cruntime" on non-Linux platforms. Output is "glibc" or "musl" on Linux platforms.
#
# Intended usage is for managed language CRTs to use this function to build native artifact paths, facilitating
# support for alternative C runtimes like Musl.
#
function(aws_determine_local_c_runtime target)
if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
execute_process(COMMAND "ldd" "--version" OUTPUT_VARIABLE AWS_LDD_OUTPUT ERROR_VARIABLE AWS_LDD_OUTPUT)
string(TOLOWER "${AWS_LDD_OUTPUT}" AWS_LDD_OUTPUT_LOWER)
message(STATUS "ldd output lower: ${AWS_LDD_OUTPUT_LOWER}")
string(FIND "${AWS_LDD_OUTPUT_LOWER}" "musl" AWS_MUSL_INDEX)
string(FIND "${AWS_LDD_OUTPUT_LOWER}" "glibc" AWS_GLIBC_INDEX)
string(FIND "${AWS_LDD_OUTPUT_LOWER}" "gnu" AWS_GNU_INDEX)
if (NOT(${AWS_MUSL_INDEX} EQUAL -1))
message(STATUS "MUSL libc detected")
set(${target} "musl" PARENT_SCOPE)
else()
if ((NOT(${AWS_GLIBC_INDEX} EQUAL -1)) OR (NOT(${AWS_GNU_INDEX} EQUAL -1)))
message(STATUS "Gnu libc detected")
else()
message(STATUS "Could not determine C runtime, defaulting to gnu libc")
endif()
set(${target} "glibc" PARENT_SCOPE)
endif()
else()
set(${target} "cruntime" PARENT_SCOPE)
endif()
endfunction()
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