Information on linking to the new Windows UCRT

ucrt-csv.py

import sys
import subprocess
import csv

def describe_ucrt_lib(platform):
    lib_path = "windows-10-sdk/Lib/10.0.10240.0/ucrt/{}/ucrt.lib".format(platform)
    output = subprocess.check_output(["nm", lib_path])
    output = output.decode("utf-8")

    # Output (x86 32-bit) looks like:
    #
    # api-ms-win-crt-conio-l1-1-0.dll:
    # 00000000 T ___conio_common_vcprintf
    # 00000000 I .idata$4
    # 00000000 I .idata$5
    # 00000000 I .idata$6
    # 00000000 I __imp____conio_common_vcprintf
    #          U __IMPORT_DESCRIPTOR_api-ms-win-crt-conio-l1-1-0
    # 00000000 T .text
    #
    # which indicates that the symbol ___conio_common_vcprintf should be found
    # in api-ms-win-crt-conio-l1-1-0.dll.
    #
    # NB: The actual function name has only two underscores; the third is
    # added (x86-32 only) as part of cdecl name mangling. We do not attempt
    # to correct for name mangling here, so if you want the unmangled name on
    # x86-32 then you need to strip off the leading underscore from all the
    # symbols.

    current_dll = None
    with open("{}.csv".format(platform), "w") as out_file:
        w = csv.writer(out_file)

        w.writerow(["DLL", "Symbol"])

        for line in output.split("\n"):
            line = line.strip()
            if line.endswith(":"):
                current_dll = line.strip(":")
            if " T " in line:
                mangled_symbol = line.split()[-1]
                if mangled_symbol == ".text":
                    continue
                if platform == "x86":
                    assert mangled_symbol.startswith("_")
                w.writerow([current_dll, mangled_symbol])

describe_ucrt_lib("x86")
describe_ucrt_lib("x64")
# Unfortunately my nm blows up on these with lots of "File format not
# recognized", "Unrecognized machine type", "Malformed archive" errors:
#describe_ucrt_lib("arm")
#describe_ucrt_lib("arm64")

x64.csv

x86.csv