csrc/crosstool-ng-1.20.0/config/libc.in

# C library options

menu "C-library"

config LIBC
    string

config LIBC_VERSION
    string
    help
      Enter the date of the snapshot you want to use in the form: YYYYMMDD
      where YYYY is the 4-digit year, MM the 2-digit month and DD the 2-digit
      day in the month.
      
      Please note:
      - glibc has snapshots done every monday, and only the last ten are kept.
      - uClibc has daily snapshots, and only the last 30-or-so are kept.
      
      So if you want to be able to re-build your toolchain later, you will
      have to save your C library tarball by yourself.

source "config.gen/libc.in"

config LIBC_SUPPORT_THREADS_ANY
    bool

config LIBC_SUPPORT_THREADS_NATIVE
    bool
    select LIBC_SUPPORT_THREADS_ANY

config LIBC_SUPPORT_THREADS_LT
    bool
    select LIBC_SUPPORT_THREADS_ANY

config LIBC_SUPPORT_THREADS_NONE
    bool

# C libraries should provide other values
config THREADS
    string
    default "none" if THREADS_NONE

if ! LIBC_none

comment "Common C library options"

choice
    bool
    prompt "Threading implementation to use:"
    default THREADS_NATIVE         if LIBC_SUPPORT_THREADS_NATIVE
    default THREADS_THREADS_LT     if LIBC_SUPPORT_THREADS_LT && ! LIBC_SUPPORT_THREADS_NATIVE
    default THREADS_NONE           if ! LIBC_SUPPORT_THREADS_ANY

config THREADS_NATIVE
    bool
    prompt "native"
    depends on LIBC_SUPPORT_THREADS_NATIVE
    help
      This selects the native threads implementation for the selected
      system and C library.

      For example, on Linux with glibc, this is NPTL; on Windows with
      mingw, this is win32.

config THREADS_LT
    bool
    prompt "linuxthreads"
    depends on LIBC_SUPPORT_THREADS_LT

config THREADS_NONE
    bool
    prompt "none"
    depends on LIBC_SUPPORT_THREADS_NONE

endchoice

config LIBC_XLDD
    bool
    prompt "Install a cross ldd-like helper"
    depends on SHARED_LIBS
    depends on ! BARE_METAL
    default y
    help
      Say 'Y' here if you want to have a ldd-like helper that
      you can run on your build system, and that will (try to)
      resolve shared libraries dependencies as if run on the
      target.
      
      Note that the cross-ldd helper is not a full replacement
      for the native ldd. Please see the help, by running it
      with '--help' for more explanations.

source "config.gen/libc.in.2"

endif # ! LIBC_none

endmenu